For animals the feed needs to be certified. With some small animal.welfare items. No use of certain drugs and some meat testing randomly.
For crops it’s soil testing a few random times a year. The land to get certified is 3 inspection to on after proof of no non approved chemical used for 7 years. Cant knowingly plant any gmo stuff there is seed contamination even though gmo is supposed to be terminator seeds. Certain farming practices like fencing you need to change to non treated posts as fencing fails.