Managing soil fertility in organic farming systems

TLDR

Organic farms rely on complex interactions among components, making soil fertility inseparable from production and environmental factors. Crop rotation, incorporating legumes, managed manures, crop residues, short‑term leys, and diverse rotations, integrates soil fertility with crop and livestock production while reducing pests and weeds. Organic fertility management requires a long‑term integrated approach, contrasting with the short‑term targeted solutions of conventional agriculture. Abstract.

Abstract

Abstract. Complex relationships exist between different components of the organic farm and the quantity and quality of the end products depend on the functioning of the whole system. As such, it is very difficult to isolate soil fertility from production and environmental aspects of the system. Crop rotation is the central tool that integrates the maintenance and development of soil fertility with different aspects of crop and livestock production in organic systems. Nutrient supply to crops depends on the use of legumes to add nitrogen to the system and limited inputs of supplementary nutrients, added in acceptable forms. Manures and crop residues are carefully managed to recycle nutrients around the farm. Management of soil organic matter, primarily through the use of short‐term leys, helps ensure good soil structure and biological activity, important for nutrient supply, health and productivity of both crops and livestock. Carefully planned diverse rotations help reduce the incidence of pests and diseases and allow for cultural methods of weed control. As a result of the complex interactions between different system components, fertility management in organic farming relies on a long‐term integrated approach rather than the more short‐term very targeted solutions common in conventional agriculture.