夏玉米专用肥氮磷钾的适宜配比试验钱桂英翟兆民王胜亭马光辉王学成（安丘市农业局２６２１００）中图分类号Ｓ１４３．５１试验材料及方法１试验点选在高、中、低不同产量水平，地势平坦，肥力均匀，有水浇条件的地块。轮作方式：小麦—玉米，一年两作制。高中低产量水平... Appropriate proportioning test of nitrogen, phosphorus and potassium for summer maize special fertilizer Qian Guiying, Zhaisa Zhaomin, Wang Shengting, Ma Guanghui, Wang Xuecheng (Anqiu Agriculture Bureau, 262100) Materials and Methods of Test 1 The test points are selected as high, medium and low Different production levels, flat terrain, fertility uniformity, water conditions of the plots. Crop rotation: wheat - corn, two copies a year. High school low production level ...