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雁北地区种植春麦历史悠久,但因耕作管理粗放,产量较低,全区平均亩产仅百斤左右,一般好地亩产可达四、五百斤。施肥一般不多,但也存在着肥料利用率不高,施肥后经济收益不大等问题。1977年我们进行了春小麦施用有机肥和氮、磷化肥的田间试验和土壤分析工作,在全区取得近百份资料的基础上,将土壤养分与施肥之间的关系归纳如下。
The cultivation of spring wheat in Yanbei has a long history. However, due to extensive farming and management and low yield, the average yield per mu in the entire region is only about 100 jin. Generally, it can produce 4 or 5 jin of mu per mu. Fertilization is generally small, but there are also problems of low utilization of fertilizer, economic benefits after fertilization and so on. In 1977, we conducted field experiments and soil analysis of spring wheat with organic manure and nitrogen and phosphorus fertilizers. Based on the data obtained in the whole region, the relationship between soil nutrients and fertilization was summarized as follows.