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Tianshui City , Gansu Province , is located in the transition zone of Longdong Loess Plateau and the western Qinling Mountain , densely populated , mountainous Sichuan less obvious contradiction between people and land , serious soil erosion , drought , agricultural production basically is constrained by natural conditions unfavorable situation. Existing research and practice show that grass crop rotation to improve soil , land raise land , improve the comprehensive benefits of farmland , crops to obtain high and stable yield , sustainable land use, and provides excellent fodder for the livestock industry to ease草畜contradiction is agricultural animal husbandry, combined with the bond , the agricultural structure adjustment measures ; based on this , the hilly area in the the Tianshui Loess Plateau gully on the role and status of the grass crop rotation in rainfed agriculture , analysis , research area grass crop rotation model for replication and distribution area , the following main arguments : ( 1 ) analysis of production conditions and the status quo of the dry farming areas in Tianshui City , Gansu Province , grass crop rotation is a scientific farming systems suitable for the conditions of the agricultural production in the area , agriculture can one of the basic measures of sustainable development . (2) The grass crop rotation to promote the principles of hilly area in Tianshui, Loess Plateau gully should adhere to the local conditions , Nourishing advantageously proper arrangements and work closely with other measures of principle . (3) The proposed mainly for Tianshui city of love to restore soil fertility , soil and water conservation -based and forage and livestock -based three grass crop rotation mode and its appropriate distribution area . ( 4 ) In accordance with the basic principles of the agricultural cycle , recommended the establishment of a \coordinated economic development, agriculture and animal husbandry sustainable development model organic combination .
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