Promoting Cassava as an Industrial Crop in Ghana: Effects on Soil Fertility and Farming System Sustainability

Table 3

Effect of crop sequence and N rate on (a) maize grain and (b) weed biomass associated with the maize crop at 8 weeks after planting on researcher-managed plots.

Crop sequence	N rate (Kg ha^−1)		Mean
	O	60
(a)
Speargrass fallow	1050	2848	1949
Cassava	3002	2738	2870
Pigeonpea	2422	2328	2697
Cowpea-maize-cowpea	1670	2128	1999
Mucuna-maize-Mucuna	2970	4195	3582
Maize-maize-maize	1380	2972	1754
Mean	2082	2868
SED: crop sequence (CS)=318.4; N Rate (NR)=115.3; CS×NR=375.8 P<F∶CS=0.001; NR=0.001; CS×NR=0.01
(b)
Speargrass fallow	585	790	686
Cassava	270	300	285
Pigeonpea	390	500	445
Cowpea-maize-cowpea	325	395	360
Mucuna-maize-mucuna	300	345	323
Maize-maize-maize	240	430	335
Mean	351	460
SED: Crop sequence (CS)=65.9; N Rate (NR)=52.4; CS×NR=112.1 P<F∶CS=0.001; NR=0.05; CS×NR=NS

Source: [14].