Once you start exploring the body of information of organic, natural, pesticide/herbicide free gardening and agriculture, you will come across an important subject: soil food web. An understanding of the concepts regarding the food web seems essential to success. Once you start looking into it, you will find one name come up again and again, Dr. Elaine Ingham. She is the diva of chemical free growing. I have happened upon a you tube video of her main presentation that i am sharing here. In the comments, I will post a link to her courses.