International Scholarly Research Notices

Research Article

Nitrogen Fertilizer Rate and Cultivar Interaction Effects on Nitrogen Recovery, Utilization Efficiency, and Agronomic Performance of Spring Barley

Table 2

values from the analysis of variance for the effects of N rate and cultivar on grain yield and nitrogen use efficiency traits in spring barley. Year, replications within year, and their associated interactions were considered random effects.


Factor	Grain yield (kg ha⁻¹)	NUE (kg kg⁻¹N)	Total N uptake (kg ha⁻¹)	UtE (kg kg⁻¹N)	BPE (kg kg⁻¹N)	HI (%)	Grain N yield (kg ha⁻¹)

N rate (N)	<0.001	<0.001	<0.001	0.006	0.018	0.978	<0.001
N-linear	<0.001	< 0.001	<0.001	0.002	0.007	0.912	<0.001
N-quadratic	0.036	0.202	0.238	0.591	0.759	0.870	0.151
Cultivar (C)	0.566	0.795	0.402	0.002	0.189	0.004	0.829
N × C	0.001	0.185	0.967	0.163	0.414	<0.001	0.761

NUE: nitrogen use efficiency, grain yield per unit of available N (soil N + applied); Total N uptake: the total N uptake in the biomass at maturity; UTE: nitrogen utilization efficiency, final grain yield per unit of N uptake; BPE: biomass production efficiency, biomass yield per unit of N taken up; HI: harvest index, the ratio of grain yield to biomass at harvest maturity; grain N yield was grain yield × grain N concentration.