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

Table 5

Interaction effects of soil tillage, cropping systems, and nitrogen fertilization on NDVI, grain N-content, N-uptake, and protein content of maize grain.

Investigated factors			Hawassa Zuria				Meskan
			NDVI	GNC (%)	GNU (kg ha^−1)	GPC (%)	NDVI
MT	RCS	Control	0.74^b	0.97^bc	31.20^bc	6.07^c	0.74^c
		20 t ha^−1 compost	0.71^b	1.05^b	38.74^b	6.60^bc	0.78^bc
		46 kg N ha^−1 +10 t ha^−1 compost	0.74^b	1.23^a	48.26^a	7.69^a	0.84^a
		92 kg N ha^−1	0.74^b	1.16^ab	47.24^a	7.24^ab	0.78^bc
	MCS	Control	0.71^b	0.74^cd	23.66^d	4.59^cd	0.72^d
		20 t ha^−1 compost	0.75^b	0.79^cd	27.43^c	4.96^cd	0.78^bc
		46 kg N ha^−1 +10 t ha^−1 compost	0.78^a	0.91^c	34.35^b	5.67^c	0.81^ab
		92 kg N ha^−1	0.79^a	0.85^cd	33.53^b	5.33^cd	0.73^cd
CT	RCS	Control	0.72^b	0.89^c	29.93^bc	5.58^c	0.74^c
		20 t ha^−1 compost	0.65^c	0.95^bc	35.01^b	5.90^c	0.80^ab
		46 kg N ha^−1 +10 t ha^−1 compost	0.80^a	1.13^ab	46.73^a	7.05^ab	0.80^ab
		92 kg N ha^−1	0.80^a	1.09^b	49.86^a	6.80^b	0.75^c
	MCS	Control	0.71^b	0.68^d	22.32^d	4.23^d	0.74^c
		20 t ha^−1 compost	0.78^ab	0.97^bc	35.65^b	6.06^c	0.78^bc
		46 kg N ha^−1 +10 t ha^−1 compost	0.77^ab	1.18^ab	47.13^a	7.39^a	0.82^a
		92 kg N ha^−1	0.78^ab	1.11^ab	45.80^a	6.94^ab	0.78^bc

Values of a parameter means followed by the same letter did not differ significantly across the tillage methods, cropping systems, and N-fertilization at  ≤ 0.05 according to the LSD test.