Advancing Biological Farming: Practicing Mineralized, Balanced Agriculture to Improve Soil & Crops - Paperbackby Leilani Zimmer Durand (Author), Gary Zimmer (Author) One of the leading authorities on biological farming, Gary Zimmer is recognized for improving farming by restoring soils. Arguing that an optimally productive soil contains a balance of inorganic minerals, organic materials and living organisms, he relies less on modern improvements than on "the things we've learned by improving fertility in a natural, sustainable way over many years." This book