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Fruit trees planted in the agricultural structure in China account for a large proportion of the cultivated area of ??more than 870 million ha, yield more than 72 million tons, is an important part of agricultural production. However, according to the survey showed that Chinese fruit tree planting in general continuation of the traditional clean tillage system. The clean tillage system can reduce the nutrition competition of weeds and fruit trees, but it can also destroy the orchard environment, reduce soil nutrient supply capacity, inhibit the growth of fruit trees, such as to cause soil compaction, soil erosion, organic matter decline, while clean tillage system can not be fully use of the orchard land resources, resulting in waste of land resources. Orchard grass as a green ecological orchard planting pattern, can effectively improve the the clean tillage orchards ecological and environmental issues, which will help fruit trees healthy growth and product quality improvement. In this study, the Pudong New Area, Nanhui new town Taoyuan planted three different varieties of grass - alfalfa (Medicago sativa L.), white clover (Trifolium repens Linn.) And chicory (Cichorium intybus L.), around the students grass orchard microclimate, soil physical and chemical properties, fruit growth, fruit quality, orchard-point source pollution control, between the grass and clean tillage, as well as the differences between the different forage species, the following main results: 1 clear grass Taoyuan microclimate features. The results show that, with grass in the hot season can significantly reduce soil temperature, improve soil moisture, the hot season in July and August, grass 5cm layer of soil temperature lower than the control 8.0-12.3 ° C ,0-10cm soil soil water content increased by 0.83% -20.62%. 2 reveals the variation of the the grass Taoyuan soil physical and chemical properties. The grass can reduce surface soil bulk density, increase the surface soil organic matter content and improve soil PH value. And the alfalfa soil improvement effect is better than chicory and white clover; vigorous growth in fruit trees, fruit nutrient accumulation period (6-8 months), grass reduces the 0-10cm of soil available phosphorus content, but the difference was not significantly during fruit ripening and fruit, planting alfalfa improve soil available phosphorus and ammonia nitrogen content, but the grass reduces soil nitrate content, while reducing the activity of urease and peroxide and catalase , reducing the role of soil organic matter decomposition. Suitable grass can promote the growth of fruit trees and fruit quality. Taoyuan planting alfalfa significantly promote the growth of new branches, the rate of increase of 24.1%, had no significant effect on the growth of planted clover new branches of peach, and planted chicory peach new branches inhibit the growth. Grass have a certain impact on fruit quality, clover and alfalfa significantly increased the soluble sugar content, but also significantly decreased the content of soluble protein in the fruit. Grass can effectively reduce the the Taoyuan surface runoff, reduce non-point source pollution, tests proved grass significantly reduce the surface runoff, planting chrysanthemum lettuce, alfalfa and white clover the surface diameter flow, respectively, compared with the control reduced 41.6%, 35.0% and 58.4%, N: P: K fertilizer application rate for acres 20kg / 10kg / mu and no fertilizer, grass area nitrogen loss decreased by 73.0%, 23.1% and 51.4%, respectively, phosphorus loss dropped by 63.3% , 73.4% and 71.2%, respectively. 5 Consolidated grass the Taoyuan microenvironment, soil physical and chemical properties, the role of the peach tree growth and fruit quality, the effect of alfalfa most obvious, followed by clover, chicory relatively low.
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