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为改善农村的环境和经济状况，利用白城子村５．７ｈｍ２幼龄苹果园和已建的４ｈｍ２鱼池对果树－牧草－养鱼系统的生产效果进行了研究。通过３年试验，证实了果树地种苜蓿，一方面可减少水分的蒸发，促进果树根系对水肥的吸收、转化、利用；另一方面苜蓿有良好的肥田作用，可增加肥源，促进果树生长，而生产的苜蓿用于养鱼，大大降低了饲料成本，每公顷水面可获纯利润１１６１０元。因此，利用果树地种植苜蓿，苜蓿喂鱼相互配合，是充分利用国土资源、发挥生物生产潜力的一种综合生产模式。
In order to improve the rural environment and economy, the production effect of the fruit tree-pasture-fish farming system was studied using the 5.7hm2 young apple orchard and the 4hm2 fish pond built in Baichengzi Village. After three years of experiments, it was confirmed that planting alfalfa with fruit trees could reduce the evaporation of water and promote the absorption, transformation and utilization of water and fertilizer by the root system of fruit trees. On the other hand, alfalfa has a good effect of fertilizing and increasing fertilizers and promoting the growth of fruit trees , While the production of alfalfa for fish farming, greatly reducing the cost of feed, water per hectare net profit will be 11,610 yuan. Therefore, the use of fruit trees planted alfalfa, alfalfa feeding fish mutual cooperation, is to make full use of land and resources, to play a potential biological production of a comprehensive mode of production.