Cropping system - Copy

Cropping system - Copy - Cropping system assignment...

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Cropping system assignment Instructor: Tr n Danh Thìn Student: Nguy n Tr ng Quý ID: 520521 Subject: From a case study of cropping system on your country, please analyze inter-relationship between its components as well as to other systems in the agri- ecosystem and solutions (if any) for improving the cropping system in term of economical, social and environment efficiency. Task: My hometown is on Hanoi countryside. So, we still have not very small area of land used for agriculture. In addition to plant cash crops such as yam, potato, and sesame, we also plant cover crops to prevent erosions and create an diversity cropping system. Besides allowing soil quality, cover crops slow runoff, compete with weeds, prevent nitrogen leaching, provide habitat for beneficial organisms. We even use cover crops as food for animal and for pharmaceutical. And the most popular cover crops in our land are legumes (sometimes other annual grasses relative of legumes). These crops provide nutrient especially nitrogen form the system, mixing grasses and legumes optimizes rapid soil cover and overall soil improvement. Legumes for crop and soil improvement. For optimum yield, crops require a supply of mineral nutrients, the most important of which is nitrogen. Exhausted soils are often low in nitrogen, meaning that farmers are normally applying inorganic fertilizers. However, as fertilizer costs increase, farmers struggle to obtain good yields. This problem can be addressed by incorporating legumes into the cropping system. Leguminous plants have a special relationship with nitrogen-fixing bacteria called Rhizobium. By biologically fixing nitrogen levels in the soil, Student: Nguy n Tr ng Quý / ID: 520521 1
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Cropping system assignment legumes provide a relatively low-cost method of replacing nitrogen in the soil, enhancing soil fertility and boosting subsequent crop yields. Legumes can be used as a green manure, a general term used for plants that enrich soil fertility. Green manuring with legumes involves growing the plants, then slashing the crop and leaving it on the soil surface. Leaving the crop on the soil surface has additional benefits, as it also reduces soil erosion and conserves soil moisture. A drawback with green manuring is that it involves the loss of a growing season, especially in areas where there is only one short growing season, since the grain is not harvested from the legume and it displaces the cereal crop. Also, because the grain is not harvested, growing legumes as green manures does not provide the benefits to human diets. However, when soil quality is low and fertilizer prices are high, green manuring is an option for farmers to consider, especially in regions with longer growing seasons. To overcome the loss of a full growing season, intercropping or relay
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This note was uploaded on 12/04/2010 for the course AGRONOMY PLB174 taught by Professor Michaelreid during the Spring '10 term at UC Davis.

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Cropping system - Copy - Cropping system assignment...

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