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In conventional farming, this nitrogen is typically applied in chemical fertilizer form. 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. [9]
Leguminous green manures such as clover and vetch contain nitrogen-fixing symbiotic bacteria in root nodules that fix atmospheric nitrogen in a form that plants can use. This performs the vital function of fertilization. Depending on the species of cover crop grown, the amount of nitrogen released into the soil lies between 40 and 200 pounds ...
Nitrogen fertilizer being applied to growing corn in a contoured, no-tilled field in Iowa.. Nutrient management is the science and practice directed to link soil, crop, weather, and hydrologic factors with cultural, irrigation, and soil and water conservation practices to achieve optimal nutrient use efficiency, crop yields, crop quality, and economic returns, while reducing off-site transport ...
Plants that contribute to nitrogen fixation include the legume family – Fabaceae – with taxa such as clover, soybeans, alfalfa, lupins, peanuts, and rooibos.They contain symbiotic bacteria called Rhizobia within nodules in their root systems, producing nitrogen compounds that help the plant to grow and compete with other plants.
Rhizobium: Symbiotic nitrogen fixation by Rhizobium with legumes contributes substantially to total nitrogen fixation. Rhizobium inoculation is a well-known agronomic practice to ensure adequate nitrogen. [5] [6] One of the most widespread species is R. leguminosarum. Bradyrhizobium spp. (in particular Bradyrhizobium japonicum). [7]
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Cover crops are also grown to enrich soil as a green manure through nitrogen fixation from the atmosphere; [33] as well as phosphorus (through nutrient mobilization) [34] content of soils. Fertilizer trees aid organic farming by bringing nutrients from the depths of the soil, and by assisting in the regulation of water usage. [35]
They require less tillage and often have longer roots, reducing soil erosion and tolerating drought. Such varieties are being developed for rice, wheat, sorghum, pigeon pea, barley, and sunflowers. These can be combined with a leguminous cover crop such as alfalfa to fix nitrogen, reducing fertilizer inputs. [23] [24]
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