Alley cropping soil productivity and nutrient recycling
Abstract
In the past few decades has been growing concem about the exhaustibility of non-renewable soil resources in developing countries in the tropics to meet the needs of present and future generations
Land degradation is a major problem in many parts of the tropics, including sub Saharan Africa, mainly owing to overexploitation of vegetation and and soil resources and adoption of inappropiate farming methods
The challenge is to increase the sustainable agricultural productivity of the land with acceptable inputs to meet increasing human needs, while maintaining the soil resource base and minimising environmental degradation
One technology that can meet this need for rainfed upland farming with low extemal chemical inputs is the alley cropping system
This technology integrates trees and shrubs in spatial zonal arrangements with food crops in the production system
The presence of woody species in the alley cropping production system has been shown to contribute to (1) nutrient recycling, (2) reduction in soil nutrient leaching losses, (3) stimulation of higher soil faunal activities , (4) soil erosion control, (5) soil fertility improvement and (6) sustained levels of crop production
These experiences can be utilised in developing sustainable and environmentally friendly agroforestry systems