1 IntroductionWith the establishment of Three Gorges Dam, 632 km2 land will be submerged, more than 1 million local people must immigrate to other places, and almost 430 thousand hm2 farmland will be returned back to ...
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1 IntroductionWith the establishment of Three Gorges Dam, 632 km2 land will be submerged, more than 1 million local people must immigrate to other places, and almost 430 thousand hm2 farmland will be returned back to forests and grassland in the next five years. The grassland, as one of the important factors in restoring vegetation in this reservoir, developed fast and played key role in ecological construction. While forage varieties being adapted to this region are very limited, and the lands to be used as grassland are much different in soil fertility, the perennial artificial grassland seriously degenerated and the grass composition was unstable. The object of this paper is to study theProductivity of newly established artificial grassland in different kinds of pre-crop lands along the Changjiang River.
Introduction The variety of Aohan alfalfa(Medicago sativa L. cv. Aohan)originally produced in Chifeng region, the cultivated history has been more than 50 years. It displayed some good characteristics, such as cold-re...
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Introduction The variety of Aohan alfalfa(Medicago sativa L. cv. Aohan)originally produced in Chifeng region, the cultivated history has been more than 50 years. It displayed some good characteristics, such as cold-resistance, drought-resistance, and high production. It has been played an important role in the local economic, especially in meat industry, animal husbandry, forage production, as well as fiber industry. The carrying capacity is only about 3.49 million animals on the area of 5.25 million hectares of nature pasture, but the domestic animals has developed 10.2496 million in 1995, that is to say, there is till 2557.5 million kg deficient in forages. So the urgent problem for the development of animal husbandry is to improve the degenerated pasture, to diminish grazing pressure, and to plant high yield and high quality alfalfa to increase the productivity of the natural and the sown pastures.
Mineral nutrition in grazing systems is vital to optimum growth and health of plants and animals. Minerals deficiencies can lead to diminished plant growth and nutritional disorders in livestock while excesses can res...
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Mineral nutrition in grazing systems is vital to optimum growth and health of plants and animals. Minerals deficiencies can lead to diminished plant growth and nutritional disorders in livestock while excesses can result in nutritional imbalances and environmental pollution. Nitrogen fertilization promotes growth of grasses, increases tillering and rate of forage maturation, can alter botanical composition, and increases crude protein in livestock diets. Excess nitrogen can lead to nitrates in ground water and nitrate toxicity in livestock. While nitrogen-to-sulfur ratios are important in plants and animals, form of dietary sulfur may have more impact on ruminant nutrition. Sulfur fertilization of forages can increase dry matter digestibility and improve nitrogen metabolism by ruminants and may reduce bonding of lignin with structural carbohydrates. Magnesium, essential
IntroductionManagement of mixed-grazer foraging is one of the most difficult issues facing the grazing-land scientist and manager today. It is difficult to develop a model that mimics system response at all the tempor...
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IntroductionManagement of mixed-grazer foraging is one of the most difficult issues facing the grazing-land scientist and manager today. It is difficult to develop a model that mimics system response at all the temporal and spatial scales represented by the mixed-grazing issue. It is difficult, if not impossible, to capture the dynamics of a system at a level meaningful to managers.A number of approaches to this knotty problem have been offered in the past. The Cooper rider and Bailey (1981) model allocated forage to specified grazing-animal groups. This approach has not been applied by either managers or scientists because environmental conditions change and animal populations ebb and flow as a result
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