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

Table 4

The effects of tillage methods, cropping systems, and N-fertilization on NDVI, grain yield, N-content, N-uptake, and grain protein content of maize at the two sites

Investigated factors	Hawassa Zuria					Meskan
	NDVI	GY kg ha^−1	GNC g kg^−1	GNU kg ha^−1	GPC %	NDVI	GY kg ha^−1	GNC g kg^−1	GNU kg ha^−1	GPC %
Tillage methods
MT	0.74	3662.6^b	9.6	35.6^b	6.0	0.77	7064.0	12.4	89.0	7.8
CT	0.75	3855.5^a	9.9	39.1^a	6.2	0.78	7094.9	12.5	89.7	7.8
LSD (0.05)	ns	142.6	ns	1.89	ns	ns	ns	ns	ns	ns
Cropping systems
RCS	0.76^a	3835.1^a	10.6^a	40.9^a	6.6^a	0.78	7101.0	13.2^a	94.5^a	8.3^a
MCS	0.74^b	3683.5^b	9.0^b	33.7^b	5.6^b	0.77	7083.2	12^b	84.3^b	7.3^b
LSD (0.05)	0.02	128.8	0.4	3.8	0.24	ns	ns	0.03	5.6	0.2
Nitrogen fertilization
Control	0.72^b	3273.3^d	8.2^d	26.8^c	5.1^d	0.74^d	5987.9^d	11.2^d	66.9^d	6.9^d
20 t ha^−1 compost	0.72^b	3628.2^c	9.4^c	34.2^b	5.9^c	0.76^c	6469.2^c	11.8^c	75.8^c	7.4^c
46 kg N ha^−1 +10 t ha^−1 compost	0.77^a	3954.4^b	11.1^a	44.1^a	6.9^a	0.82^a	8169.4^a	13.8^a	112.5^a	8.6^a
92 kg N ha^−1	0.78^a	4180.5^a	10.5^b	44.1^a	6.6^b	0.79^b	7741.8^b	13^b	102.1^b	8.3^b
LSD (0.05)	0.03	113.7	0.6	2.62	0.35	0.02	310.4	0.04	4.2	0.25

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.