Years ago, I learned at an ECHO conference (https://www.echonet.org/) that sustainable agriculture needed to be integrated. For example, rabid folks, for decades, have claimed that cattle are a waste of the land. That's a high stack of bovine manure. Kine and even more goats can graze on rocky lands. Regardless, they maintain the health of prairie lands which would need a substantial movement of organic materials and work to convert into intense vegetable production. By moving chickens (via tractors) into the lastly grazed areas, the land heals quicker. Such pairie lands are a vital part of a macro-eco-system. These lands then facilitate the possibility of maximizing of nearby crop production.