Farmers are required to demonstrate that they use appropriate tillage and cultivation practices without negative impacts on soil structure, and manage crop nutrients and fertility using crop rotations, cover corps, and application of organic materials. There is also a requirement that soil organic matter be maintained or improved in a manner that does not contaminate crops, soil, or water by plant nutrients, pathogenic organisms, heavy metals, or prohibited materials. The farmer must have a system for monitoring all practices and procedures, as well as records for all farm inputs, harvest products, and storage facilities.