ABSTRACT
This chapter reviews the state of knowledge concerning the impact of the C.R. system on prevention and alleviation of soil erosion in agriculture. Cropping sequences and rotations intended to prevent soil deterioration and promote soil rehabilitation are dependent on geographical environment. Crop yields are in the first instance dependent on water availability. Constraints on crop production in humid regions are primarily radiation, temperature, nutrition, sanitation, erosion, and waterlogging. Soil and water conservation managements are especially important to low-input dryland agriculture with 200- to 500-mm precipitation. Crop rotation benefits that maintain high productivity and conserve soil and water resources have long been recognized. Soil and water conservation practices are crucial for long-term sustainable agriculture. To ensure that these practices are implemented, there must be positive cooperation and interaction between research, regional planning, extension service, and government legislation.
