Results of the 2017 Corn Management Yield Potential Trial

Identification of management responsive and nitrogen-loss tolerant hybrids

Management Yield Potential (MYP) for corn

Alison Vogel and Eric Winans

Alison photo Eric photo

 

Do you ‘shoot for the stars’ for highest yield, or play it more cautiously? Do you take an offensive or defensive approach when it comes to your production management style? Do you have some prime land that you want to push to the limits, or some less- than perfect land, that you’re looking to plant to a stable hybrid?

 It is important to understand the characteristics of corn hybrids and their yield response to different crop management factors in order to maximize productivity on your farm. Our laboratory has aimed to characterize current commercial corn hybrids and their potential yield under different crop management dynamics, namely, their Management Yield Potential.

The Management Yield Potential (MYP) project aims to identify ‘Racehorse’ hybrids, or hybrids with adaptability to high yield environments (e.g, responsive to crop management), and ‘Workhorse’ hybrids, or hybrids with acceptable yields in a low fertility environment (e.g. tolerant to N loss).

 ‘Workhorse’ hybrids

Workhorses are those that are reliable under a wide range of conditions, they may not be flashy, but they’ll get the job done under a wide range of circumstances. Where there’s less- than- perfect fields in less- than- perfect weather conditions, these hybrids will still have a decent yield. Of all the factors that can be managed, the availability of nitrogen (N) fertilizer has the greatest impact on corn yield. But even if you fertilize with an adequate amount of N, droughts or excessive rain may reduce how much N is available to the plant. Therefore, we have classified ‘Workhorse’ hybrids as ones having an above- average Check Plot (yield at 0 lb N acre-1) and a high initial response to N (InitN, yield increase between 0 and 60 lb N acre-1 at 32,000 plants acre-1). These two factors are the most important for determining a hybrid’s yield stability over a range of production conditions. An example is shown in Figure 1.

scatter graph of workhorse yields

Figure 1. Identifying workhorse hybrids as those having both an above- average yield with no N fertilizer, and above- average yield increase when provided 60 lb N/ acre. Data points are from 42 commercial hybrids grown in 2014 at Champaign, IL. Figure adapted from Mastrodomenico and Below 2014.

Racehorse’ hybrids

While defining a workhorse hybrid is straightforward, characterization of ‘Racehorse’ hybrids is more complex (Fig. 2). Racehorses are hybrids that can be pushed to their maximum yield with proper management of fertility, population, and row spacing. To achieve greater yields, it may be necessary to use narrower rows in combination with more plants per acre (Fig. 3). In 2015, we developed a new approach to estimate the ‘Racehorse’ index of a hybrid, including yield changes in response to variation in nitrogen supply, plant population, and row spacing.

example racehorse high yield potential, workhorse has quick response to nitrogen

Figure 2. Example of the relationship between N fertilizer rate and corn grain yield for classification of ‘Workhorse’ and ‘Racehorse’ hybrids. ‘Workhorse’ hybrids have a higher check plot yield and a higher initial response to N, while ‘Racehorse’ hybrids exhibit a larger maximum response to fertilizer N.

 

example of intermediate and maximum yield response to population

Figure 3. Example of the characterization of a corn hybrid tolerant to high planting population, represented by an intermediate yield response to population (IntRTP, e.g the yield response between 32,000 and 38,000 plants acre-1) and a maximum yield response to plant population (MaxRTP, e.g yield response between 38,000 and 44,000 plants acre-1).  For both IntRTP and MaxRTP, the characterization is done with a non-limiting rate of fertilizer N.

 

 

2017 Study

Printer-friendly .pdf of yields  and full characterization report

For 2017, the trial was planted using a precision plot planter with variable seeding rate capability (SeedPro 360, ALMACO, Nevada, IA) at Yorkville, IL (16 May), Champaign, IL (19 April), and Harrisburg, IL (9 May). Plots were 17.5 feet in length with 30 or 20-inch row spacing and two rows in width. Force 3G insecticide was applied at planting and Bicep II Magnum (2.5 qt/A) was applied prior to planting as a pre-emergence herbicide. Nitrogen treatments were broadcast applied with urea at 0, 60, and 280 lb N acre-1 between the V4-V6 developmental stages at Yorkville, IL (6 June), Champaign, IL (22 May), and Harrisburg, IL (1 June). Forty- eight hybrids represented by seven different seed brands, with comparative relative maturities (CRMs) ranging from 104-118 days were evaluated (Table 1). Treatments included: (i) 32,000 plants acre-1 at 30-inch row space and 0 lb N acre-1, (ii) 32,000 plants acre-1 at 30-inch row space and 60 lb N acre-1, (iii) 32,000 plants acre-1 at 30-inch row space and 280 lb N acre-1, (iv) 38,000 plants acre-1 at 30-inch row space and 280 lb N acre-1, (v) 44,000 plants acre-1 at 30-inch row space and 280 lb N acre -1, and (vi) 44,000 plants acre-1 at 20-inch row space and 280 lb N acre ‑1. At maturity, plots were harvested with a two-row plot combine and grain yield is reported as bushels acre-1 at 15.5% moisture concentration. Data also collected and considered were soil test values (Table 2) and weather (Table 3).

Table 1. The distribution of 48 hybrids evaluated in the Management Yield Potential trial in 2017 grown at Yorkville, Champaign, and Harrisburg, IL. Hybrids are sorted by company, brand, and CRM.

Hybrid

Brand

Company

CRM

Yorkville

Champaign

Harrisburg

G05B91-3010

Golden Harvest

Syngenta

105

X

X

 

SL5536ZL-3010

Golden Harvest

Syngenta

105

X

X

 

G06Z97-3120

Golden Harvest

Syngenta

106

X

X

 

G07F23-3111

Golden Harvest

Syngenta

107

X

X

X

G09A86-3111

Golden Harvest

Syngenta

109

X

X

X

G09Y24-3220

Golden Harvest

Syngenta

109

X

X

X

SK6405-3220

Golden Harvest

Syngenta

110

X

X

X

G10T63-3122

Golden Harvest

Syngenta

110

X

X

X

G11X64-3010

Golden Harvest

Syngenta

111

 

X

X

G12W66-3000GT

Golden Harvest

Syngenta

112

X

X

X

G14R38-3122

Golden Harvest

Syngenta

114

X

X

X

G14V04-3000GT

Golden Harvest

Syngenta

114

 

X

X

G15L32-3111

Golden Harvest

Syngenta

115

X

X

X

SL8675-3110

Golden Harvest

Syngenta

116

 

X

X

G18D87-3111

Golden Harvest

Syngenta

118

 

X

X

6538SSRIB

Stone

Monsanto

115

X

X

X

6188SSRIB

Stone

Monsanto

111

X

X

X

5848SSRIB

Stone

Monsanto

108

X

X

X

DKC62-52

DeKalb

Monsanto

112

X

X

X

DKC63-21

DeKalb

Monsanto

113

X

X

X

DKC64-34

DeKalb

Monsanto

114

X

X

X

DKC60-87

DeKalb

Monsanto

110

X

X

X

DKC66-74

DeKalb

Monsanto

116

X

X

X

DKC65-94

DeKalb

Monsanto

115

X

X

210-26STXRIB

Channel

Monsanto

110

X

X

X

212-20STXRIB

Channel

Monsanto

112

X

X

X

215-75STXRIB

Channel

Monsanto

115

X

X

X

D51SS54

Dyna-Gro

CPS

111

X

X

X

D52SS91

Dyna-Gro

CPS

112

X

X

X

D52SS63

Dyna-Gro

CPS

112

X

X

X

D54VC52

Dyna-Gro

CPS

114

X

X

X

D54DC94

Dyna-Gro

CPS

114

X

X

X

D56VC46

Dyna-Gro

CPS

116

X

X

X

D57VC51

Dyna-Gro

CPS

117

X

X

X

D58VC65

Dyna-Gro

CPS

118

X

X

X

D55VC45

Dyna-Gro

CPS

115

X

X

4895SS/RIB

Croplan

WinField

108

X

X

X

5887VT2P

Croplan

WinField

108

X

X

6110SS/RIB

Croplan

WinField

110

X

X

X

5290DGVT2P

Croplan

WinField

112

X

X

X

6594SS/RIB

Croplan

WinField

113

X

X

X

6640VT3P

Croplan

WinField

113

X

X

X

5678VT2P

Croplan

WinField

116

X

X

X

7927VT3P/RIB

Croplan

WinField

117

X

X

X

8621VT2P/RIB

Croplan

WinField

117

X

X

X

4488SS

Croplan

WinField

104

X

 

P1197AMXT

Pioneer

Pioneer

111

X

X

X

P1311AMXT

Pioneer

Pioneer

113

X

X

X

 

Table 2. Preplant soil test values for the 2017 Yorkville, Champaign, and Harrisburg, IL field sites, obtained from 1 to 6 inches deep and extracted using Mehlich III.

Location

OM

pH

CEC

P

K

Ca

Mg

%

meg/100g

ppm

ppm

ppm

ppm

Yorkville

4.1

7.0

21.1

34

171

2939

711

Champaign

3.8

6.0

22.3

78

222

2846

470

Harrisburg

2.3

6.2

13.8

31

114

1945

165

 

Table 3. Precipitation and temperature during the production season at Yorkville, Champaign, and, Harrisburg, IL in 2017 compared to the 30-year average (Ave.). Values were obtained from the Illinois State Water Survey.

 

Yorkville, IL 

Champaign, IL

Harrisburg, IL

Precip. (in)

Temp. (oF)

Precip. (in)

Temp. (oF)

Precip. (in)

Temp. (oF)

Month

2017

Ave.

2017

Ave.

2017

Ave.

2017

Ave.

2017

Ave.

2017

Ave.

April

6.9

4.0

54

50

5.8

3.7

57

52

14.1

4.4

61

56

May

4.7

4.3

58

61

5.9

4.9

61

63

4.8

5.1

66

66

June

1.8

4.3

72

70

2.1

4.3

73

72

2.3

4.5

74

75

July

7.0

4.7

74

74

2.8

4.7

76

75

1.2

3.8

79

78

Aug.

2.8

4.1

70

72

2.2

3.9

71

73

4.2

3.0

73

77

Sept.

0.1

3.1

68

65

0.8

3.1

69

66

1.5

3.1

70

69

 

The treatments were arranged in a split block experimental design with four replications. Data were analyzed using analysis of variance with the PROC MIXED procedure of SAS (SAS V8 Institute, Cary, NC) and means were separated using Fisher’s protected LSD test at the 0.10 level of significance. Normality for residuals and outlier observations were evaluated using PROC UNIVARIATE in SAS. Row spacing, hybrid, N fertilizer rate, and plant population were considered fixed effects, while block and interactions with blocks were considered random effects.

Hybrid yields were ranked from 1 to 10 using the PROC RANK procedure of SAS to generate decile scores for the: unfertilized check plot yield (yield at 0 lb N acre-1 and 32,000 plants acre-1), yield response to low N (RTLowN; yield change between 0 and 60 lb N acre-1 at 32,000 plants acre-1), yield response to high N (RTN; yield change between 0 and 280 lb N acre-1 at 32,000 plants acre-1), yield response to intermediate population (RTIntPop; yield response between 32,000 and 38,000 plants acre-1 at 280 lb N acre-1), yield response to high plant population (RTHiPop; yield change between 38,000 and 44,000 plants acre-1 at 280 lb N acre-1), and yield response to row space (RTS; yield change between 30 and 20 inch row spacing at 44,000 plants acre-1 and 280 lb N acre-1). This assessment provides scores for each parameter and hybrid within each location, and combined across all locations using the overall yield for the hybrid. Scores for each parameter (and the indices) were ranked from 0 to 10, with 0 being the least yield increase compared to the overall average, and 10 being the greatest yield increase compared to the overall average, with an average ranking a 5.  

‘Racehorse’ and ‘Workhorse’ indices were estimated using a multiple regression approach with the Smith-Hazel index (Smith, 1936; Hazel, 1943). Moreover, the genotypic and phenotypic variance-covariance matrices among all the parameters were estimated using restricted maximum likelihood in PROC MIXED of SAS (Holland, 2006). Index weights (vector) for each parameter were estimated by multiplying the phenotypic covariance matrix, the genotypic covariance matrix, and a vector of weight 1 (Eq. 1). ‘Racehorse’ and ‘Workhorse’ indices were calculated using the relative weights to each parameter multiplied by the scores (Eq. 2 and 3).

                                                                                                                            [1]

 

                     [2] 

                                                    [3]

 

Where b is the vector of the weights of the indices, is the inverse matrix of the phenotypic variance-covariance, G is the matrix of the genetic variance-covariance, and is the initial weight.

 

Yield Results

Environmental conditions in 2017 created relatively consistent hybrid performances across the three locations of the trial (Table 3).  April started the season warm but very wet, especially at Harrisburg, which led to relatively late planting there. Summer was drier, except for heavy rains in July at Yorkville. Most notably, at all sites, August was much cooler than normal, promoting good grain fill and yield, while September was warmer than normal, with no early frost.

The following three sections correspond to the corn yield results at Yorkville, Champaign, and Harrisburg, IL for each treatment and hybrid, and the yield responses to different agronomic management factors. The next six tables (e.g. Tables 4 to 9) describe the yield rank of the hybrids under different N conditions across different row space and planting population arrangements. Yield values for all treatment combinations are then described in a summary table (e.g. Table 10). Yield response to different agronomic managements (e.g. Figure 1a and 1b) is described for each location.

Overall average check plot yields (0 lb N acre-1) were 225, 211, and 232 bu acre-1 at Yorkville, Champaign, and Harrisburg, IL, respectively. Higher check plot yields at Yorkville and Champaign were associated with high residual N, mineralized from soil organic matter, leading to less yield response to N fertilizer than previous years. An exceptionally high check plot yield also in Harrisburg can be credited to timely rains and a cooler than average August. Overall average yield increases over the check plots using low N were 38, 44, and 46 bu acre-1, and high N increased corn yields by 60, 55, and 54 bu acre-1 over the check plot yields at Yorkville, Champaign, and Harrisburg, IL, respectively.

Overall yield increases due to increasing plant population to the moderate level were 10, 7, and 15 bu acre-1, while the highest plant population increased yield by an additional 0, 4, and 5 bu acre-1 for Yorkville, Champaign, and Harrisburg, respectively. Optimal growing conditions across all locations allowed a majority of the hybrids tested to tolerate higher plant populations. Many hybrids demonstrated yield potentials exceeding 300 bu acre-1, which can be attributed to planting higher populations. The overall average yield response to narrower row spacing was 16, 6, and 8 bu acre-1 at Yorkville, Champaign, and Harrisburg, respectively. Consistent across all locations, narrower row spacing decreased inter-plant competition under higher plant densities and increased individual plant and overall yields.

 

At Yorkville, IL, hybrids yielded similarly between the intermediate and the high plant populations, but demonstrated a large yield increase to the narrower row spacing. As a result, a new Crop Physiology Lab yield record of 379 bu acre-1 was achieved with Croplan 7927VT3P/RIB when placed in a narrower row arrangement and high N (Table 4). Other hybrids achieving exceptional yields when placed in narrower rows at Yorkville were DeKalb DKC65-94, Channel 215-75STXRIB, Pioneer P1311AMXT, and Dyna-Gro D55VC45. The range in yield responses to both narrower row spacing and increased plant population at Champaign, IL was a good reminder that not all hybrids are created equal (Table 17). When switching from 30 to 20 inch rows, Golden Harvest G18D87-3111 increased in yield by over 50 bu acre-1, yet Croplan 6640VT3P decreased in yield by more than 50 bu acre-1. An example of a hybrid showing a positive yield response to both intermediate and high plant population is Golden Harvest G12W66-3000GT. In contrast, an example of a hybrid that did not tolerate increased plant population and showed a decrease in yield at Champaign was Pioneer P1311AMXT. The site providing the highest yields on average across the three locations in 2017 was Harrisburg, IL (Table 24). High check plot yields and large yield increases from fertilization even with 60 lb N acre-1 fertilizer were the main reasons for such a high trial average yield of 286 bu acre-1. Examples of hybrids with a high check plot yield and above average yield response to 60 lb N acre-1 at Harrisburg are Golden Harvest G14V04-3000GT and Dyna-Gro D54DC94. 

 

Yorkville, IL

 

Table 4. Grain yield of the 44 hybrid entries grown under agronomic conditions of 32,000 plants acre-1, 0 lb N acre-1, and 30-inch row spacing at Yorkville, IL in 2017. 

 

Rank

Hybrid

Grain yield

 

Rank

Hybrid

Grain yield

 

 

bu acre-1

 

 

 

bu acre-1

1

6110SS/RIB

262.6

23

G07F23-3111

223.0

2

8621VT2P/RIB

255.5

24

6188SSRIB

222.2

3

D54VC52

249.3

25

P1197AMXT

221.5

4

G10T63-3122

247.7

26

6640VT3P

221.1

5

5290DGVT2P

245.9

27

5887VT2P

220.4

6

P1311AMXT

245.6

28

4488SS

219.3

7

D56VC46

243.4

29

G09Y24-3220A

218.5

8

D52SS91

242.8

30

G06Z97-3120

218.0

9

G09A86-3111

240.0

31

DKC62-52

217.7

10

D58VC65

239.6

32

5678VT2P

215.9

11

DKC65-94

238.8

33

DKC60-87

211.5

12

210-26STXRIB

237.7

34

5848SSRIB

209.9

13

DKC66-74

235.4

35

6594SS/RIB

209.6

14

7927VT3P/RIB

235.0

36

212-20STXRIB

208.3

15

D52SS63

234.0

37

G14R38-3122

207.5

16

SK6405-3220

233.6

38

G12W66-3000GT

206.3

17

G15L32-3111

233.3

39

4895SS/RIB

206.1

18

D55VC45

232.8

40

G05B91-3010

204.7

19

215-75STXRIB

228.3

41

DKC63-21

201.8

20

D57VC51

226.7

42

D51SS54

201.0

21

6538SSRIB

224.8

43

D54DC94 

200.3

22

DKC64-34

223.8

44

SL5536ZL

190.7

Mean

225.3

 

LSD (P ≤ 0.10)

29.9

 

 

 

 

 

 

Table 5. Grain yield of the 44 hybrid entries grown under agronomic conditions of 32,000 plants acre-1, 60 lb N acre-1, and 30-inch row spacing at Yorkville, IL in 2017. 

Rank

Hybrid

Grain yield

 

Rank

Hybrid

Grain yield

 

 

bu acre-1

 

 

 

bu acre-1

1

5290DGVT2P

326.8

23

4488SS

260.7

2

P1311AMXT

308.0

24

G06Z97-3120

260.4

3

8621VT2P/RIB

299.5

25

G07F23-3111

260.0

4

7927VT3P/RIB

284.6

26

6640VT3P

258.6

5

SK6405-3220

282.8

27

DKC63-21

254.4

6

G10T63-3122

281.8

28

5848SSRIB

254.1

7

G15L32-3111

278.8

29

5678VT2P

253.7

8

G14R38-3122

278.5

30

215-75STXRIB

253.2

9

P1197AMXT

275.8

31

DKC64-34

252.8

10

D56VC46

274.9

32

5887VT2P

251.6

11

G12W66-3000GT

274.1

33

G05B91-3010

251.0

12

DKC66-74

274.0

34

G09Y24-3220A

250.5

13

6110SS/RIB

272.7

35

6538SSRIB

250.1

14

D55VC45

270.0

36

D57VC51

247.9

15

4895SS/RIB

268.0

37

DKC60-87

247.2

16

D58VC65

267.3

38

D51SS54

246.3

17

G09A86-3111

266.5

39

D52SS91

245.3

18

210-26STXRIB

266.3

40

D54DC94 

243.8

19

DKC65-94

265.0

41

6188SSRIB

241.5

20

6594SS/RIB

263.9

42

D52SS63

241.0

21

D54VC52

263.1

43

212-20STXRIB

235.1

22

DKC62-52

262.6

44

SL5536ZL

197.7

Mean

262.8

 

LSD (P ≤ 0.10)

29.9

 

 

 

 

 

 

Table 6. Grain yield of the 44 hybrid entries grown under agronomic conditions of 32,000 plants acre-1, 280 lb N acre-1, and 30-inch row spacing at Yorkville, IL in 2017.

 

Rank

Hybrid

Grain yield

 

Rank

Hybrid

Grain yield

 

 

bu acre-1

 

 

 

bu acre-1

1

7927VT3P/RIB

333.1

23

D57VC51

280.8

2

P1311AMXT

330.5

24

DKC63-21

279.5

3

G10T63-3122

322.5

25

6188SSRIB

279.5

4

5290DGVT2P

319.0

26

6640VT3P

277.8

5

8621VT2P/RIB

317.7

27

D52SS91

277.4

6

P1197AMXT

314.3

28

G06Z97-3120

277.2

7

DKC66-74

306.6

29

5678VT2P

277.1

8

D56VC46

303.5

30

4488SS

276.7

9

SK6405-3220

302.4

31

G09Y24-3220A

275.2

10

D54VC52

298.6

32

212-20STXRIB

274.4

11

6594SS/RIB

298.4

33

5887VT2P

274.0

12

DKC65-94

294.6

34

DKC64-34

272.9

13

G12W66-3000GT

293.8

35

215-75STXRIB

272.8

14

D55VC45

292.9

36

4895SS/RIB

272.3

15

DKC62-52

292.1

37

5848SSRIB

271.7

16

G09A86-3111

287.7

38

D52SS63

271.6

17

G15L32-3111

287.5

39

D51SS54

271.2

18

6110SS/RIB

287.1

40

210-26STXRIB

268.3

19

D58VC65

284.9

41

G14R38-3122

264.3

20

G07F23-3111

284.3

42

DKC60-87

262.7

21

6538SSRIB

282.2

43

G05B91-3010

259.9

22

D54DC94 

281.9

44

SL5536ZL

211.5

Mean

285.6

 

LSD (P ≤ 0.10)

29.8

 

 

 

 

 

Table 7. Grain yield of the 44 hybrid entries grown under agronomic conditions of 38,000 plants acre-1 at 280 lb N acre-1 and 30-inch row spacing at Yorkville, IL in 2017. 

Rank

Hybrid

Grain yield

 

Rank

Hybrid

Grain yield

 

 

bu acre-1

 

 

 

bu acre-1

1

7927VT3P/RIB

356.3

23

6538SSRIB

292.8

2

G10T63-3122

348.4

24

5678VT2P

292.3

3

P1311AMXT

340.6

25

DKC63-21

290.7

4

5290DGVT2P

337.4

26

4488SS

289.5

5

P1197AMXT

331.1

27

6594SS/RIB

286.5

6

D56VC46

327.7

28

5887VT2P

284.9

7

8621VT2P/RIB

322.6

29

215-75STXRIB

283.2

8

D55VC45

322.2

30

6640VT3P

281.5

9

DKC65-94

320.2

31

210-26STXRIB

280.2

10

DKC64-34

319.9

32

G09A86-3111

279.8

11

DKC66-74

318.8

33

D54DC94 

279.3

12

DKC62-52

314.2

34

6188SSRIB

274.5

13

D52SS63

307.5

35

G14R38-3122

273.7

14

D54VC52

306.0

36

DKC60-87

273.5

15

G15L32-3111

302.1

37

D57VC51

273.3

16

G09Y24-3220A

299.6

38

G06Z97-3120

273.0

17

SK6405-3220

297.0

39

D51SS54

272.4

18

G07F23-3111

295.7

40

212-20STXRIB

267.4

19

D52SS91

295.3

41

5848SSRIB

264.8

20

D58VC65

295.0

42

G05B91-3010

252.6

21

6110SS/RIB

293.6

43

4895SS/RIB

250.2

22

G12W66-3000GT

293.3

44

SL5536ZL

221.8

Mean

295.0

 

LSD (P ≤ 0.10)

30.3

 

 

 

 

                                                                                                             

Table 8. Grain yield of the 44 hybrid entries grown under agronomic conditions of 44,000 plants acre-1 at 280 lb N acre-1 and 30-inch row spacing at Yorkville, IL in 2017. 

Rank

Hybrid

Grain yield

 

Rank

Hybrid

Grain yield

 

 

bu acre-1

 

 

 

bu acre-1

1

5290DGVT2P

336.2

23

6538SSRIB

293.0

2

8621VT2P/RIB

327.9

24

212-20STXRIB

292.0

3

G10T63-3122

327.4

25

G12W66-3000GT

291.8

4

DKC65-94

327.4

26

210-26STXRIB

291.1

5

P1311AMXT

327.3

27

DKC64-34

289.4

6

7927VT3P/RIB

326.5

28

6188SSRIB

288.0

7

D56VC46

319.6

29

G07F23-3111

287.4

8

DKC66-74

314.4

30

5848SSRIB

287.0

9

P1197AMXT

312.3

31

6110SS/RIB

286.7

10

D52SS63

311.7

32

G06Z97-3120

285.7

11

D55VC45

311.5

33

D54DC94 

285.1

12

DKC62-52

310.3

34

DKC63-21

279.6

13

D54VC52

305.2

35

D57VC51

279.1

14

SK6405-3220

305.0

36

215-75STXRIB

278.5

15

G09A86-3111

302.0

37

G14R38-3122

276.8

16

D58VC65

300.4

38

G09Y24-3220A

275.4

17

D52SS91

299.4

39

G05B91-3010

272.7

18

6594SS/RIB

298.5

40

D51SS54

272.4

19

G15L32-3111

298.0

41

6640VT3P

272.4

20

5887VT2P

295.8

42

4895SS/RIB

271.6

21

5678VT2P

295.2

43

DKC60-87

261.3

22

4488SS

294.7

44

SL5536ZL

225.0

Mean

295.2

 

LSD (P ≤ 0.10)

30.2

 

 

 

 

 

Table 9. Grain yield of the 44 hybrid entries grown under agronomic conditions of 44,000 plants acre-1 at 280 lb N acre-1 and 20-inch row spacing at Yorkville, IL in 2017. 

Rank

Hybrid

Grain yield

 

Rank

Hybrid

Grain yield

 

 

bu acre-1

 

 

 

bu acre-1

1

7927VT3P/RIB

379.2

23

D58VC65

310.7

2

DKC65-94

359.6

24

5848SSRIB

309.9

3

215-75STXRIB

356.2

25

G12W66-3000GT

309.7

4

P1311AMXT

355.6

26

D54DC94 

309.6

5

D55VC45

352.2

27

D52SS63

309.0

6

DKC66-74

337.7

28

D51SS54

306.7

7

SK6405-3220

335.7

29

G14R38-3122

300.6

8

G10T63-3122

333.8

30

6594SS/RIB

298.3

9

8621VT2P/RIB

333.5

31

DKC63-21

295.8

10

5290DGVT2P

333.0

32

4895SS/RIB

295.5

11

6188SSRIB

330.6

33

DKC60-87

294.3

12

D57VC51

329.2

34

G09Y24-3220A

291.2

13

5678VT2P

325.7

35

5887VT2P

288.8

14

6538SSRIB

325.2

36

6110SS/RIB

286.1

15

DKC64-34

323.4

37

6640VT3P

285.4

16

DKC62-52

320.5

38

210-26STXRIB

283.3

17

D56VC46

319.1

39

G15L32-3111

280.1

18

G07F23-3111

318.3

40

G05B91-3010

279.5

19

G09A86-3111

317.2

41

4488SS

278.8

20

P1197AMXT

316.6

42

D52SS91

265.0

21

D54VC52

316.0

43

G06Z97-3120

261.9

22

212-20STXRIB

313.5

44

SL5536ZL

228.9

Mean

311.4

 

LSD (P ≤ 0.10)

36.2

 

 

 

 

 

Table 10. Individual yield values of all hybrid entries (n = 44) grown under two levels of row spacing (30 and 20 inches), three levels of plant population (32,000, 38,000, and 44,000 plants acre-1) and three levels of N supply (0, 60, and 280 lb N acre-1) at Yorkville, IL in 2017. Trial means and hybrid yield ranges are shown for comparison. Hybrids are sorted by relative maturity within each brand. Each value is the average of four replications.

Row Spacing

30 inches

20 inches

Plant Population (plants/acre)

32,000

38,000

44,000

44,000

Seed Brand

Nitrogen Level (lbs/acre)

Hybrid

0

60

280

280

280

------------------------------------------ bushels/acre -----------------------------------------

Golden Harvest

SL5536ZL

191

198

212

222

225

229

G05B91-3010

205

251

260

253

273

280

G06Z97-3120

218

260

277

273

286

262

G07F23-3111

223

260

284

296

287

318

G09Y24-3220A

218

251

275

300

275

291

G09A86-3111

240

266

288

280

302

317

SK6405-3220

234

283

302

297

305

336

G10T63-3122

248

282

323

348

327

334

G12W66-3000GT

206

274

294

293

292

310

G14R38-3122

208

278

264

274

277

301

G15L32-3111

233

279

288

302

298

280

Channel

210-26STXRIB

238

266

268

280

291

283

212-20STXRIB

208

235

274

267

292

313

215-75STXRIB

228

253

273

283

279

356

DeKalb

DKC60-87

212

247

263

274

261

294

DKC62-52

218

263

292

314

310

321

DKC63-21

202

254

280

291

280

296

DKC64-34

224

253

273

320

289

323

DKC65-94

239

265

295

320

327

360

DKC66-74

235

274

307

319

314

338

Stone

5848SSRIB

210

254

272

265

287

310

6188SSRIB

222

241

280

274

288

331

6538SSRIB

225

250

282

293

293

325

Dyna-Gro

D51SS54

201

246

271

272

272

307

D52SS63

243

245

277

295

299

265

D52SS91

234

241

272

308

312

309

D54DC94

200

244

282

279

285

310

D54VC52

249

263

299

306

305

316

D55VC45

233

270

293

322

312

352

D56VC46

243

275

303

328

320

319

D57VC51

227

248

281

273

279

329

D58VC65

240

267

285

295

300

311

Croplan

4488SS

219

261

277

290

295

279

4895SS/RIB

206

268

272

250

272

296

5887VT2P

220

252

274

285

296

289

6110SS/RIB

263

273

287

294

287

286

5290DGVT2P

246

327

319

337

336

333

6640VT3P

221

259

278

281

272

285

6594SS/RIB

210

264

298

287

299

298

5678VT2P

216

254

277

292

295

326

7927VT3P/RIB

235

285

333

356

327

379

8621VT2P/RIB

256

299

318

323

328

334

Pioneer

P1197AMXT

221

276

314

331

312

317

P1311AMXT

246

308

331

341

327

356

LSD (P ≤ 0.10)

30

30

30

30

30

36

Mean

225

263

286

295

295

311

Range

191-263

198-327

212-333

222-356

225-336

229-379

 

2017 Yield response to Low N at Yorkville, Illinois

2017 Yield response to high N at Yorkville Illinois

Figure 1a. Yield change due to low nitrogen supply (i.e., yield increase between 0 and 60 lbs N acre-1 at 32,000 plants acre-1), and the yield response to high nitrogen (i.e., yield increase between 0 and 280 lbs N acre-1) at Yorkville, IL in 2017.

 

 

2017 Yield response to intermediate population at yorkville, Illinois

2017 Yield response to high population at yorkville, Illinois

2017 Yield response to 20 inch row spacing at yorkville, Illinois

Figure 1b. Yield response to intermediate population (yield change between 32,000 and 38,000 plants acre-1 at 280 lb N acre-1), yield response to high plant population (yield change between 38,000 and 44,000 plants acre-1 at 280 lb N acre-1), and the yield response to narrower row spacing (yield change between 30 and 20 inch row spacing at 44,000 plants acre-1 and 280 lb N acre-1) at Yorkville, IL in 2017.

Champaign, IL

 

Table 11. Grain yield of the 44 hybrid entries grown under agronomic conditions of 32,000 plants acre-1, 0 lb N acre-1, and 30-inch row spacing at Champaign, IL in 2017. 

Rank

Hybrid

Grain yield

 

Rank

Hybrid

Grain yield

 

 

bu acre-1

 

 

 

bu acre-1

1

G18D87-3111

250.2

23

4895SS/RIB

208.7

2

5290DGVT2P

236.2

24

G11X64-3010

208.1

3

8621VT2P/RIB

233.2

25

6538SSRIB

208.1

4

5678VT2P

233.1

26

DKC64-34

207.8

5

D57VC51

230.3

27

DKC60-87

207.7

6

G09A86-3111

227.6

28

212-20STXRIB

207.0

7

SK6405-3220

227.5

29

D52SS91

204.9

8

G15L32-3111

227.0

30

P1311AMXT

204.7

9

D58VC65

226.5

31

G09Y24-3220A

204.6

10

G07F23-3111

223.3

32

P1197AMXT

203.5

11

215-75STXRIB

222.2

33

G14R38-3122

202.6

12

DKC66-74

221.1

34

D54VC52

201.1

13

SL8675-3110

220.1

35

D56VC46

200.9

14

210-26STXRIB

219.1

36

5848SSRIB

197.8

15

D51SS54

219.0

37

G14V04-3000GT

197.4

16

D54DC94 

218.3

38

G10T63-3122

190.2

17

D52SS63

218.2

39

DKC62-52

187.5

18

6110SS/RIB

216.4

40

G12W66-3000GT

185.1

19

G06Z97-3120

216.4

41

6594SS/RIB

184.9

20

6640VT3P

214.8

42

DKC63-21

184.3

21

6188SSRIB

212.9

43

G05B91-3010

181.9

22

7927VT3P/RIB

209.8

44

SL5536ZL

170.1

Mean

210.7

 

LSD (P ≤ 0.10)

31.5

 

 

 

 

 

Table 12. Grain yield of the 44 hybrid entries grown under agronomic conditions of 32,000 plants acre-1, 60 lb N acre-1, and 30-inch row spacing at Champaign, IL in 2017. 

Rank

Hybrid

Grain yield

 

Rank

Hybrid

Grain yield

 

 

bu acre-1

 

 

 

bu acre-1

1

SL8675-3110

286.3

23

DKC62-52

254.3

2

5290DGVT2P

280.4

24

P1197AMXT

251.4

3

G07F23-3111

280.0

25

D51SS54

250.8

4

G09Y24-3220A

279.9

26

D52SS63

250.8

5

5678VT2P

279.0

27

DKC60-87

248.9

6

D58VC65

275.8

28

6538SSRIB

248.9

7

8621VT2P/RIB

274.9

29

G06Z97-3120

248.7

8

212-20STXRIB

271.7

30

G15L32-3111

248.5

9

D57VC51

271.0

31

G11X64-3010

245.1

10

D56VC46

269.3

32

DKC64-34

244.8

11

G18D87-3111

269.1

33

P1311AMXT

244.6

12

D54VC52

263.8

34

7927VT3P/RIB

241.9

13

G09A86-3111

263.3

35

DKC63-21

241.7

14

6640VT3P

262.9

36

G12W66-3000GT

240.0

15

6110SS/RIB

261.9

37

G14R38-3122

239.7

16

6188SSRIB

261.4

38

4895SS/RIB

239.2

17

D54DC94 

261.1

39

5848SSRIB

238.7

18

SK6405-3220

260.7

40

G14V04-3000GT

236.1

19

G10T63-3122

260.2

41

DKC66-74

235.7

20

D52SS91

259.5

42

6594SS/RIB

229.7

21

215-75STXRIB

257.3

43

G05B91-3010

217.0

22

210-26STXRIB

255.0

44

SL5536ZL

206.7

Mean

254.7

 

LSD (P ≤ 0.10)

31.2

 

 

 

 

 

Table 13. Grain yield of the 44 hybrid entries grown under agronomic conditions of 32,000 plants acre-1, 280 lb N acre-1 and 30-inch row spacing at Champaign, IL in 2017. 

Rank

Hybrid

Grain yield

 

Rank

Hybrid

Grain yield

 

 

bu acre-1

 

 

 

bu acre-1

1

8621VT2P/RIB

314.2

23

210-26STXRIB

265.2

2

5678VT2P

302.6

24

G09A86-3111

264.3

3

SL8675-3110

296.1

25

DKC66-74

263.5

4

5290DGVT2P

291.7

26

DKC64-34

262.2

5

P1311AMXT

290.5

27

G14R38-3122

261.7

6

G18D87-3111

285.6

28

D56VC46

261.5

7

D54DC94 

284.6

29

G06Z97-3120

259.9

8

D58VC65

284.2

30

D52SS63

259.7

9

G09Y24-3220A

284.2

31

6538SSRIB

259.1

10

G10T63-3122

283.4

32

212-20STXRIB

259.1

11

G07F23-3111

282.5

33

P1197AMXT

258.7

12

DKC62-52

279.5

34

6110SS/RIB

258.2

13

DKC60-87

272.9

35

G11X64-3010

252.9

14

D54VC52

272.8

36

7927VT3P/RIB

250.6

15

SK6405-3220

270.7

37

D51SS54

244.4

16

6640VT3P

270.6

38

DKC63-21

243.2

17

215-75STXRIB

270.5

39

D52SS91

241.2

18

D57VC51

269.9

40

4895SS/RIB

238.1

19

5848SSRIB

269.7

41

G05B91-3010

236.2

20

G15L32-3111

267.6

42

6594SS/RIB

228.2

21

G14V04-3000GT

265.7

43

G12W66-3000GT

226.6

22

6188SSRIB

265.3

44

SL5536ZL

218.7

Mean

265.6

 

LSD (P ≤ 0.10)

31.8

 

 

 

 

 

Table 14. Grain yield of the 44 hybrid entries grown under agronomic conditions of 38,000 plants acre-1 at 280 lb N acre-1 and 30-inch row spacing at Champaign, IL in 2017. 

Rank

Hybrid

Grain yield

 

Rank

Hybrid

Grain yield

 

 

bu acre-1

 

 

 

bu acre-1

1

SL8675-3110

312.5

23

P1311AMXT

273.7

2

P1197AMXT

309.3

24

D52SS91

273.7

3

8621VT2P/RIB

301.8

25

212-20STXRIB

272.8

4

D57VC51

301.6

26

G07F23-3111

272.6

5

7927VT3P/RIB

300.3

27

D51SS54

272.0

6

G10T63-3122

297.1

28

DKC60-87

271.1

7

G09A86-3111

296.0

29

G15L32-3111

268.5

8

G18D87-3111

293.2

30

G14V04-3000GT

267.7

9

G09Y24-3220A

290.2

31

215-75STXRIB

267.4

10

SK6405-3220

283.8

32

D52SS63

264.7

11

210-26STXRIB

283.2

33

5678VT2P

261.6

12

D54DC94 

282.1

34

DKC62-52

261.6

13

5848SSRIB

281.0

35

4895SS/RIB

257.5

14

G11X64-3010

280.0

36

G12W66-3000GT

257.2

15

G14R38-3122

279.3

37

G06Z97-3120

254.8

16

6640VT3P

279.3

38

6188SSRIB

252.8

17

D56VC46

279.0

39

6110SS/RIB

245.1

18

D54VC52

277.0

40

6594SS/RIB

240.3

19

DKC64-34

277.0

41

DKC63-21

240.2

20

D58VC65

276.7

42

6538SSRIB

231.4

21

5290DGVT2P

276.2

43

G05B91-3010

230.0

22

DKC66-74

273.9

44

SL5536ZL

222.0

Mean

272.5

 

LSD (P ≤ 0.10)

35.5

 

 

 

 

 

Table 15. Grain yield of the 44 hybrid entries grown under agronomic conditions of 44,000 plants acre-1 at 280 lb N acre-1 and 30-inch row spacing at Champaign, IL in 2017. 

Rank

Hybrid

Grain yield

 

Rank

Hybrid

Grain yield

 

 

bu acre-1

 

 

 

bu acre-1

1

SL8675-3110

320.6

23

D51SS54

276.7

2

G09Y24-3220A

310.5

24

6188SSRIB

275.2

3

D58VC65

297.5

25

6538SSRIB

274.4

4

G09A86-3111

297.1

26

5678VT2P

274.3

5

D56VC46

297.0

27

G11X64-3010

273.2

6

G07F23-3111

296.9

28

DKC66-74

271.9

7

P1197AMXT

296.4

29

DKC60-87

271.0

8

212-20STXRIB

294.7

30

DKC64-34

270.7

9

5290DGVT2P

291.7

31

DKC62-52

270.3

10

G10T63-3122

290.7

32

G14R38-3122

270.0

11

8621VT2P/RIB

288.6

33

6110SS/RIB

266.7

12

D54VC52

287.5

34

D52SS63

265.7

13

210-26STXRIB

285.9

35

G14V04-3000GT

264.6

14

6640VT3P

284.8

36

G18D87-3111

262.4

15

D54DC94 

284.7

37

DKC63-21

261.2

16

7927VT3P/RIB

284.3

38

G06Z97-3120

257.9

17

D52SS91

281.8

39

P1311AMXT

253.3

18

D57VC51

281.7

40

6594SS/RIB

250.9

19

SK6405-3220

280.9

41

4895SS/RIB

249.2

20

5848SSRIB

280.9

42

G15L32-3111

248.0

21

215-75STXRIB

280.7

43

SL5536ZL

232.1

22

G12W66-3000GT

278.6

44

G05B91-3010

229.5

Mean

276.4

 

LSD (P ≤ 0.10)

32.8

 

 

 

 

 

Table 16. Grain yield of the 44 hybrid entries grown under agronomic conditions of 44,000 plants acre-1 at 280 lb N acre-1 and 20-inch row spacing at Champaign, IL in 2017. 

Rank

Hybrid

Grain yield

 

Rank

Hybrid

Grain yield

 

 

bu acre-1

 

 

 

bu acre-1

1

DKC64-34

328.4

23

G09A86-3111

282.1

2

G18D87-3111

320.6

24

5678VT2P

282.0

3

SL8675-3110

318.3

25

D57VC51

282.0

4

5848SSRIB

310.1

26

G11X64-3010

281.7

5

6188SSRIB

306.5

27

DKC63-21

280.9

6

G10T63-3122

303.7

28

D56VC46

279.7

7

P1197AMXT

303.2

29

G09Y24-3220A

278.7

8

DKC62-52

302.6

30

210-26STXRIB

275.9

9

G14V04-3000GT

301.4

31

215-75STXRIB

275.4

10

SK6405-3220

301.3

32

G14R38-3122

274.9

11

DKC60-87

299.8

33

G12W66-3000GT

273.4

12

5290DGVT2P