.:: Lao Knowledge Base on Conservation Agriculture ::.
In addition to their nutrient pump role, rotations of various plant species diversify the soil flora and fauna. Their roots secrete different organic substances that attract a diverse range of bacteria and fungi. These microorganisms subsequently play an important role with respect to nutrient availability for the crops. Crop rotations are especially important for integrated pest management since they upset the pathological cycles. Weeds are controlled through the effects of shade (competition for light) and/or allelopathic effects (competition between plants of different species via toxic substances excreted by the roots or leaves). Crop diversification also provides a range of different products (food for humans and livestock), thus enhancing economic stability.
