Grain Yield and Nitrogen Uptake of Maize (Zea mays L.) as Affected by Soil Management Practices and Their Interaction on Cambisols and Chernozem

Table 3

Analysis of variance of NDVI, grain yield, nitrogen uptake, and protein content of maize grown at the two sites.

Source variation	DF	Hawassa Zuria					Meskan
		NDVI	GY	GNC	GNU	GPC	NDVI	GY	GNC	GNU	GPC
TM	1	ns		ns	ns	ns	ns	ns	ns	ns	ns
CS	1						ns	ns
NF	3
TM×CS	1	ns	ns				ns	ns	ns	ns	ns
TM×NF	3	ns	ns				ns	ns	ns	ns	ns
CS×NF	3		ns	ns	ns	ns	ns	ns
TM×CS×NF	3		ns					ns	ns	ns	ns
Replication	2	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
Rep.×TM	2	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
Rep.×TM×CS	4	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
CV (%)		4.1	4.6	6.9	8.3	6.8	2.9	5.2	3.8	5.6	3.8

DF: degree of freedom; NDVI: normalized difference vegetation index; GY: grain yield; GNC: grain N-content; GNU: grain N-uptake; GPC: grain protein content; CV: coefficient of variation. Significant at  ≤ 0.05; significant at  ≤ 0.01; significant at  ≤ 0.001; ns: not significant.