Soil Amendments and Rotation Effects on Soybean and Maize Growths and Soil Chemical Changes in Northern Ghana

Table 4

Economic benefits of soybean and maize rotation under different soil amendments in the northern savanna of Ghana.

Treatments	Gross benefit	Total variable cost GHS	Net benefit GHS	Benefit/cost ratio
2014
Maize after maize	2710	1624	1087	1.7
Maize after noninoculated soybean	1983	1551	432	1.3
Maize after inoculated soybean	2437	1596	841	1.5
Maize after inoculated soybean + P, K	2900	1643	1258	1.8
Maize after inoculated soybean + fertisol	3294	1682	1612	2
Maize after inoculated soybean + N, P, K	2497	1602	895	1.6
Maize after inoculated soybean + P, K + fertisol	2820	1635	1186	1.7
2016
Maize after maize	1576	1510	66	1
Maize after noninoculated soybean	2262	1579	683	1.4
Maize after inoculated soybean	1588	1511	76	1.1
Maize after inoculated soybean + P, K	1962	1549	413	1.3
Maize after inoculated soybean + fertisol	2250	1578	673	1.4
Maize after inoculated soybean + N, P, K	1888	1541	346	1.2
Maize after inoculated soybean + P, K + fertisol	2300	1583	718	1.5

GHS = Ghana cedis; 1 U$ = 3.9 GHS.