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What It Is and How We Got It
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able acid acre activator added addition amount animals applied Association bacteria better bone calcium called carbonate carried cause cent CHAPTER chemical clay compost condition contains course covered crops cultivate deficiency difference disease drainage earth earthworm easily effect elements fact farms feed fertilisers fertility forking fruit fungi garden give given grass green ground grow grown growth heap heavy humus important instance keep kind known land layer leaves lime live manure material means method million minerals moisture mulch mycelium natural necessary never nitrogen organic matter plant foods plants plot possible potash prevent produced quantities result rich roots rotted sedge peat soil sometimes sq yd straw substances supply surface taken tons trees usually vegetable waste weed seeds weeds worms