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How Earthworms Help Soils
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absorbed acid soils added aeration agricultural alkaline American Bait Farms amount animal annelidic annelidic consumption areas available to plants bacteria beds biodegradable BIOLOGY OF EARTHWORMS burrows calcium carbonate caliginosa capsules carbon dioxide carbon-to-nitrogen ratio cells Chapter chemical clay soils coelomic color commercial compost compounds contain crops decay decomposition deficiency earthworm castings earthworm channels earthworm population Ecology effects of earthworms enzymes excreted factors feed fertilizers garden growers humus increase infiltration intestine ions large number layer leaching Lumbricus terrestris magnesium manganese manure manure worm material micro-organisms microbial activity minerals moisture mulch nephridia nephridium nightcrawler nitrate nitrogen North American Bait nutrients organic matter oxygen percent phosphate phosphorus photosynthesis plant growth plant nutrients plant roots potassium production protein red worm sandy soil soil particles soil pH soil solution soil structure soil types soluble studies sulfur temperature terre topsoil vegetables vermiculture waste yields zinc