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In organic farming, nitrogen inputs may take the form of organic fertilizers, compost, cover crop seed, and fixation by legume cover crops. [8] This quality of cover crops is called fertilizer replacement value.
Supplying enough nitrogen and particularly synchronization, so that plants get enough nitrogen at the time when they need it most, is a challenge for organic farmers. [55] Crop rotation and green manure ("cover crops") help to provide nitrogen through legumes (more precisely, the family Fabaceae), which fix nitrogen from the atmosphere through ...
An organic garden on a school campus. The following outline is provided as an overview of and topical guide to organic gardening and farming: . Organic farming – alternative agricultural system that relies on fertilizers of organic origin such as compost, manure, green manure, and bone meal and places emphasis on techniques such as crop rotation and companion planting.
Rapeseed is also used as a cover crop in the US during the winter as it prevents soil erosion, produces large amounts of biomass, suppresses weeds and can improve soil tilth with its root system. Some cultivars of rapeseed are also used as annual forage and are ready for grazing livestock 80 to 90 days after planting. [22]
The use of cover crops to help control weeds also increases organic residue in the soil (and nutrients, when using legumes). [36] Cover crops then need to be killed so that the newly planted crops can get enough light, water, nutrients, etc. [37] [38] This can be done by rollers, crimpers, choppers and other ways.
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