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密云县西田各庄示范区土壤良性循环研究初探１试验情况（１）田间试验：试验安排在本示范区大辛庄村东南一块地上，共６亩，分９个小区，每区面积１５×２６．６８ｍ２．按二年三熟粮油倒茬方式，三年时间中施肥重复４季。观测项目包括作物生长情况、土壤养分（有机质、ＮＨ－?
Preliminary study on the virtuous cycle of soil in Nishidagezhuang demonstration zone in Miyun County 1 Test situation (1) Field experiment: The experiment was arranged on a piece of ground in the southeast of Daxinzhuang village in this model area, with a total area of 6 acres and 9 subdivisions, each with an area of 15 × 26. 68m2. According to two years cooked three-way grain crop upside down, three years of fertilization repeated four seasons. Observations include crop growth, soil nutrients (organic matter, NH-?