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

Table 5.

Effect of hybrid maturity class and population on whole corn plant characteristics (yr 2)

Item	Hybrid maturity class × Population¹								SEM	P-value²
Item	MEM:49,421	MEM:69,189	MEM:88,958	MEM:108,726	MLM:49,421	MLM:69,189	MLM:88,958	MLM:108,726	SEM	F-test	Int.	Maturity	Population
Actual Population ³	43892^e	58125^d	72715^c	93167^a	45208^e	59798^d	75586^b	91253^a	801	<0.01	0.02	0.09	Q^MEM, L^MLM
Grain Yield	10.12^e	12.38^c	13.43^ab	13.81^a	11.40^d	12.88^bc	13.56^ab	13.54^ab	0.31	<0.01	0.04	0.04	Q^{MEM, MLM}
Corn Stover Yield ⁴^,⁵	8.92	10.11	9.84	10.27	9.75	9.93	10.22	10.65^a	0.27	<0.01	0.32	0.06	L
Whole Plant Yield ⁴^,⁵	19.05	22.49	23.27	24.08	21.15	22.81	23.79	24.19^a	0.51	<0.01	0.18	0.03	Q
Grain, % ⁵	53.18^e	55.12^cd	57.86^a	57.41^ab	53.84^de	56.45^abc	56.99^abc	55.88^bc	0.67	<0.01	0.02	0.76	Q^{MEM, MLM}
Residue NDF, %	60.29^d	61.28^d	63.70^c	66.34^b	64.17^c	67.39^ab	68.08^a	68.97^a	0.61	<0.01	0.02	< 0.01	L^MEM, Q^MLM
Residue NDFD, % ⁶	32.57	31.66	29.98	31.24	33.52	32.09	31.58	33.03	1.00	0.25	0.83	0.01	Q
Residue TDN, %	48.74	48.41	46.98	45.99	47.14	45.45	44.94	44.72	0.66	<0.01	0.48	< 0.01	L
Whole Plant TDN, %	72.27	73.00	73.65	72.91	71.88	72.48	72.38	71.78	0.30	<0.01	0.33	< 0.01	Q
TDN yield/ha ⁷	13.77	16.50	17.13	17.60	15.30	16.51	17.24	17.39	0.41	<0.01	0.12	0.23	Q

^a–d

Means with different superscripts differ (P < 0.05).

MEM = moderately early maturity, MLM = moderately late maturity; harvest dates: 1 = August 23, 2012; 2 = September 6, 2012; 3 = September 24, 2012.

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).

Actual population in plants/ha.

⁴

Yield in t/ha.d

⁵

Harvest Index, DM basis.

⁶

Residue in-situ NDF digestibility.

⁷

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