华北麦区多半是两年三作或一年两作,肥料比较缺乏,在小麦播种前施用基肥数量也不大,所施的肥料是有机肥料。在播种后,因气温逐渐降低,肥料分解转化比较慢,因之肥效较迟。整个小 North China wheat is mostly two or three crops for two crops a year, the lack of fertilizer, the amount of base fertilizer applied before sowing wheat is not large, the fertilizer is applied organic fertilizer. After sowing, due to the gradual decrease in temperature, decomposition of fertilizer decomposition is relatively slow, so fertilizer later. The whole small