[8], Crop rotation is a required practice, in the United States, for farm seeking organic certification. In Your organic vegetable garden, preparing correct crop rotation plan is a major requirement of success. Crop rotation: The growing of different crops on a piece of land in a pre¬planned succession is known as crop rotation. Efficient fallow management is an essential part of reducing erosion in a crop rotation system. In addition to enhancing crop productivity, sequestration of atmospheric carbon has great implications in reducing rates of climate change by removing carbon dioxide from the air. ]VIany definitions of crop rotation given in textbooks, bulletins, dictionaries, and encyclopedias go beyond their field and lend to limit the term by defining good rotations or by bringing into the definition the attributes or purposes of a good rotation or the objects sought to be accom])lished by it. Crop rotation is based on growing a series of different types of crops in the same area in sequential seasons. Such weeds, however, give no trouble in cultivated fields devoted to corn, potatoes, etc.. Their cultivation helps to exterminate them. Examples of this practice might entail: a broccoli - winter wheat - sweet corn rotation; a wheat - fallow - alfalfa - potato rotation; a grass … As a rule, such excreta are not equally injurious to a different class of crops, and a rotation, therefore, lessens the injury. Rose CW, Freebairn DM. In this district, a two-year rotation in which four crops are grown is found to be quite successful. How much nitrogen made available to the plants depends on factors such as the kind of legume, the effectiveness of rhizobia bacteria, soil conditions, and the availability of elements necessary for plant food.[20]. The dense and far-reaching root systems give ample structure to surrounding soil and provide significant biomass for soil organic matter. Soil organic matter is a mix of decaying material from biomass with active microorganisms. Many crops which are critical for the market, like vegetables, are row crops (that is, grown in tight rows). [16] Increasing biodiversity also increases the resilience of agro-ecological systems.[7]. By requiring planting and harvesting of different crops at different times, more land can be farmed with the same amount of machinery and labour. Weeds make farmers less efficient when harvesting, because weeds like bindweeds, and knotgrass, can become tangled in the equipment, resulting in a stop-and-go type of harvest. The annual cost of seed and the preparation of the land for the crop is one-half or one-third as much if the crop is continued for two or three years respectively, as it is if allowed to remain only one year. These processes promote internal nutrient cycling and minimize the need for synthetic fertilizers and large-scale machinery. There will sometimes be a conflict between the harvest of wheat and hay, and the cultivation of corn, requiring a little extra labor at that time. However, many farmers have success managing rotations by planning sequencing and cover crops around desirable cash crops. Under crop rotation, the number of viable seeds in the soil is reduced through the reduction of the weed population. During a process called nodulation, the rhizobia bacteria use nutrients and water provided by the plant to convert atmospheric nitrogen into ammonia, which is then converted into an organic compound that the plant can use as its nitrogen source. He thus complies fully with the crop rotation requirement'. [15] The “Crop Rotation Practice Standard” for the National Organic Program under the U.S. Code of Federal Regulations, section §205.205, states, Farmers are required to implement a crop rotation that maintains or builds soil organic matter, works to control pests, manages and conserves nutrients, and protects against erosion. This improves soil health and provides crop benefits over the length of the rotation. Crimson clover may be seeded in the tomatoes at the last cultivation, and growth turned under the following spring for the benefit of a succeeding crop. Changelog: 1.1.0.49 Skydrive synchronization. Every seventh year they would not till, prune or even control insects.[3]. [26] The formation of soil aggregates is important for erosion control, as they are better able to resist raindrop impact, and water erosion. Pigweed, bindweed, foxtail, and crab-grass are common in corn and potato fields. Thus allowing them leisure during the remainder of the year. 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