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大城县东近北村是廊坊市农科所建立的橱窗村,已有十一年的历史。在此过程中,由于采取了以氮磷协调为核心的快速高产技术,使300多亩小麦单产由37公斤逐年递增到450公斤以上,成为本县知名的高产典型。但近三、四年来,产量却出现了滑坡,单产降到300—350公斤,成为当地干部群众共同忧虑的问题。为了解开这个滑坡之谜,我们于1993年对该村土壤进行了化验,结果土壤中钾已从八十年代的130PPm下降到现在的72PPm,镁、锌、锰等微量元素也都分别降到了4.63PPm、0.85PPm和4.86PPm,达到或接近临界值。这是长期单纯大量投入氮、磷化肥而忽视了钾肥和微肥的
County near East Village in Beijing is Langfang Agricultural Science established window village, has 11 years of history. In this process, due to the rapid and high-yielding technology with the coordination of nitrogen and phosphorus as the core, the output of 300 mu of wheat has risen from 37 kilograms to more than 450 kilograms per year, making this county a well-known high-yielding typical. However, in the recent three or four years, the yield has been on the decline and the yield has dropped to 300-350 kg, which has become a common concern among local cadres and the masses. In order to solve the mystery of the landslide, we tested the soil of the village in 1993, and as a result, the potassium in the soil dropped from 130PPM in the 1980s to 72PPM now. The trace elements such as magnesium, zinc and manganese also dropped to 4.63 PPm, 0.85 PPm and 4.86 PPm, reaching or approaching the critical value. This is a long time a large number of pure nitrogen, phosphorus fertilizer and neglect of potash and fertilizer