Evaluation of Two Irrigation Scheduling Methods and Nitrogen Rates on Corn Production in Alabama

Table 5

Summary of ANOVA for grain yield, aboveground biomass, N uptake, and NUE with respect to N rates (0, 202, 269, and 336 kg ha^-1), irrigation, and years (2014–2015) at TVREC.

Sources of variation	Grain yield (Mg ha^−1)	Aboveground biomass (Mg ha^−1)	Grain N concentration (g kg^−1)	Stover N concentration (g kg^−1)	Grain N uptake (g kg^−1)	Aboveground N uptake (kg N ha^−1)	Nitrogen use efficiency
							AEn^ǂ	REn^§	IEn^¶	PFPn^#
Irrigation (I)	Ns^£	Ns	Ns	Ns	Ns	Ns	Ns		Ns	Ns
N rate (N)	∗	Ns	Ns	Ns	Ns			Ns	Ns
Year (Y)		Ns			Ns
I x N	Ns	Ns	Ns	Ns	Ns	Ns	Ns	Ns	Ns	Ns
Y x N		Ns	Ns	Ns	Ns			Ns	Ns
Y x I	Ns	Ns	Ns	Ns	Ns	Ns	Ns		Ns	Ns
Y x I x N	Ns	Ns	Ns	Ns	Ns	Ns	Ns	Ns	Ns	Ns

^∗Significant at 0.05 probability level. ^£Nonsignificant at 0.05 probability level. ^ǂAEn: nitrogen agronomy efficiency. ^§REn: recovery efficiency. ^¶IEn: nitrogen internal efficiency. ^#PFPn: nitrogen partial productivity.