Residual Nitrogen Contributions from Grain Legumes to the Growth and Development of Succeeding Maize Crop

Table 5

Effect of previous legume crops and nitrogen fertilizer levels on dry weight of succeeding maize crop at Samaru, Zaria, Nigeria during 1998 cropping season.

Treatments	Weeks after sowing
	8	12
Previous Crops (P)
Soyabean	52.21b	164.53e
Cowpea	49.52b	181.41cd
Lablab	65.85a	246.72a
Groundnut	52.41b	197.99b
Previous maize	36.80d	154.99e
Fallow	49.03bc	185.91bc
SE±	3.89	4.95
Nitrogen (kg N ha^-1)
0	36.82d	127.29d
40	44.55c	182.44c
80	56.93b	216.10b
120	65.62a	228.54a
Interaction (P × N)	NS	*

Means followed by the same letter(s) within the same treatment group and same week are not statistically different using DMRT (P = 0.05).