Modelling long-term effects of crop residue management for sustainable farming systems

摘要: Field research has shown a significant yield increase with the use of millet crop residues (CR) as soil mulch. The short-term profitability this management practice is, however, low. This paper examines long-term effects mulching on fertility, decreasing accessibility fallow and, consequently, reduction in opportunity restoring fertility through using multi-period dynamic linear programming model. Depending an assumed discounting rate for future incomes, evaluation indicates that mulch application can be economically profitable compared to tested alternative uses such at lower rates and trade stover. Four scenarios were analysed which focused different land : labour ratios, discount rates, prices CR, specific combination working capital. importance is shown, well stover absence sufficient fallow. optimal fallow, producing consuming activities master shortage, are presented. However, all show CR alone, degradation cannot prevented.