AN EVALUATION OF THE PERFORMANCE OF MAIZE AND COWPEA IN SOLE AND INTERCROPPING SYSTEMS AT TWO SAVANNA ZONES OF GHANA: A SIMULATION STUDY.
Similar analysis at Tamale indicated that sole cowpea was the most preferred cropping system under the natural soil fertility condition whereas a modest application of nitrogen fertiliser increased the gross margins of sole maize and intercropping, the latter being the preferred choice. With the introduction of a relatively high level of nitrogen fertiliser (about 80 kg N ha-1), sole maize became the “best” cropping alternative.
The multi-criteria analysis considered the performance of the alternative cropping systems under both economic (gross margins) and sustainability factors such as soil cover, the quantity and quality of crop residue and the potential for nitrogen leaching. The results indicated that for a sustainable production, intercropping maize and cowpea together with a modest fertiliser application was generally the ‘best’ cropping system for both Accra and Tamale.