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. 2017 Sep 1;1(3):367–381. doi: 10.2527/tas2017.0045

Table 2.

Effect of hybrid maturity class and harvest date on whole corn plant characteristics (yr 1)

Item Hybrid maturity class × Harvest1 SEM P-value2
MEM:1 MEM:2 MEM:3 MLM:1 MLM:2 MLM:3 F-test Int. Maturity Harvest
Plant DM, %3 37.56 44.50 – 34.05 40.30 – – – – – –
Actual Population4 62134 62134 62134 63454 63454 63454 588 0.98 1.00 < 0.01 NS
Grain Yield 11.284 12.26bc 12.00c 10.86d 12.79ab 13.01a 0.28 <0.01 <0.01 0.01 QMEM,MLM
Corn Stover Yield5,6 10.01 10.91 9.97 11.06 11.83 11.07 0.20 <0.01 0.85 < 0.01 Q
Whole Plant Yield5,6 21.29 23.17 21.97 21.92 24.62 24.08 0.36 <0.01 0.10 < 0.01 Q
Grain, %6 52.96b 52.84bc 54.57a 49.71d 51.96c 53.96a 0.33 <0.01 <0.01 < 0.01 QMEM, LMLM
Residue NDF, % 65.13 61.79 65.44 66.43 63.76 67.13 0.47 <0.01 0.76 < 0.01 Q
Residue NDFD, %7 34.83c 35.25bc 24.73d 38.87a 36.83b 25.59d 0.61 <0.01 0.02 < 0.01 QMEM,MLM
Residue TDN, % 48.98 50.95 42.05 49.47 50.49 41.04 0.41 <0.01 0.16 0.35 Q
Whole Plant TDN, % 72.35 73.23 69.84 71.21 72.60 69.09 0.20 <0.01 0.40 < 0.01 Q
TDN yield/ha8 15.37 16.98 15.39 15.48 17.86 16.59 0.31 <0.01 0.11 < 0.01 Q
a–d

Means with different superscripts differ (P < 0.05).

1

MEM = moderately early maturity, MLM = moderately late maturity; harvest dates: 1 = September 1, 2011; 2 = September 15, 2011; 3 = September 29, 2011.

2

F-test = overall F-test, Int = Interaction between hybrid maturity class and harvest, Maturity = P-value for the hybrid maturity class effect, Harvest = orthogonal contrast P-value for the harvest effect; NS = not significant (P > 0.05), L = linear response (P < 0.05), Q = quadratic response (P < 0.05).

3

Average plant DM as a reference for each hybrid maturity class × harvest combination (no data available for harvest 3).

4

Actual population in plants/ha.

5

Yield in t/ha.

6

Harvest Index, DM basis.

7

Residue in-situ NDF digestibility.

8

TDN yield/ha (t of TDN/ha) = whole plant TDN × whole plant yield.