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In agriculture, cover crops are plants that are planted to cover the soil rather than for the purpose of being harvested.Cover crops manage soil erosion, soil fertility, soil quality, water, weeds, pests, diseases, biodiversity and wildlife in an agroecosystem—an ecological system managed and shaped by humans.
Cover crops then need to be killed so that the newly planted crops can get enough light, water, nutrients, etc. [34] [35] This can be done by rollers, crimpers, choppers and other ways. [36] [37] The residue is then planted through, and left as a mulch. Cover crops typically must be crimped when they enter the flowering stage. [38]
In agriculture, a living mulch is a cover crop interplanted or undersown with a main crop, and intended to serve the purposes of a mulch, such as weed suppression and regulation of soil temperature. Living mulches grow for a long time with the main crops, whereas cover crops are incorporated into the soil or killed with herbicides.
The United States aims to double the country's cover crop plantings to 30 million acres by 2030 under a new Department of Agriculture (USDA) conservation program launched on Monday.
Cover crops may be used to manage soil erosion, soil fertility, water content, weeds, pests, agricultural diseases, and biodiversity on land that is repeatedly farmed. They are commonly off-season crops planted after harvesting a cash crop in order to help conserve the integrity of the land through a fallow period.
Crop rotation and cover crops prevent soil erosion, by protecting topsoil from wind and water. [32] Effective crop rotation can reduce pest pressure on crops, provides weed control, reduces disease build up, and improves the efficiency of soil nutrients and nutrient cycling. [128] This reduces the need for fertilizers and pesticides. [127]
Integrating certain crops, especially cover crops, into crop rotations is of particular value to weed management. These crops crowd out weeds through competition. In addition, the sod and compost from cover crops and green manure slows the growth of what weeds are still able to make it through the soil, giving the crops further competitive ...
Single-species cover cropping, in rotation with cash crops, increases agroecosystem diversity; a cover crop polyculture further increases that diversity, and there is evidence, using a range of cover crop treatments with or without legumes, that this increases ecosystem functionality, in terms of weed suppression, nitrogen retention, and above ...
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