<P> Farmers are required to implement a crop rotation that maintains or builds soil organic matter, works to control pests, manages and conserves nutrients, and protects against erosion . Producers of perennial crops that aren't rotated may utilize other practices, such as cover crops, to maintain soil health . </P> <P> In addition to lowering the need for inputs by controlling for pests and weeds and increasing available nutrients, crop rotation helps organic growers increase the amount of biodiversity on their farms . Biodiversity is also a requirement of organic certification, however, there are no rules in place to regulate or reinforce this standard . Increasing the biodiversity of crops has beneficial effects on the surrounding ecosystem and can host a greater diversity of fauna, insects, and beneficial microorganism in the soil. <Some studies point to increased nutrient availability from crop rotation under organic systems compared to conventional practices as organic practices are less likely to inhibit of beneficial microbes in soil organic matter . </P> <P> While multiple cropping and intercropping benefit from many of the same principals as crop rotation, they do not satisfy the requirement under the NOP . </P> <P> Multiple cropping systems, such as intercropping or companion planting, offer more diversity and complexity within the same season or rotation, for example the three sisters . An example of companion planting is the inter-planting of corn with pole beans and vining squash or pumpkins . In this system, the beans provide nitrogen; the corn provides support for the beans and a "screen" against squash vine borer; the vining squash provides a weed suppressive canopy and discourages corn - hungry raccoons . </P>

Name and describe two method of increasing crop production