In this Newsletter you will find articles concerning: possibilities for maintenance of soil fertility in low external input farming, intensive agricultural use of the humid tropical forests, how to reform shifting cultivation into sustainable agriculture, and the “in-situ” rainwater harvesting technique of CPATSA/EMBRAPA
Table of contents:
1 - 1written by Meine van NoordwijkIntegration of farming systems in the world economy puts a stress on possibilities for maintenance of soil fertility under 'low external input' circumstances, as increased losses by export of farm products have to be compensated. Some alternatives to fertiliser use may, however, be present, depending on the local situation. Several non-agricultural "developments" interfere with traditional techniques for maintaining soil fertility. If sufficient labour is available, losses from the system can be reduced and recirculation increased. Contrary to the high-input fertiliser option, no general "green-revolution" recipes are possible. A solution for each situation will have to start with an analysis of strong and weak points of the present situation.
1 - 4written by ILEIA editorial teamAn interview with Ir. J. van der Heide.
5 - 8written by Erik van der WerfIn the West African country Ghana, the ecosystem and hence the food production are standing under severe pressure. Population growth and decreasing rainfall are main causes for this. To feed more mouths means that more food has to be produced. For this reason more land has to be put into production. But in an agricultural system of shifting cultivation the consequence is that there is less possibility for fallow.