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我区磷肥施用得少,土壤缺磷严重,速效含磷量低于5ppm的面积占46.9％;土壤有机质含量偏低,旱地平均为1.41％,比六十年代下降0.33％;群众对小麦有单施氮肥,多次追肥的习惯。从1979年开始进行小麦配方施肥试验,取得明显效果:亩施纯氮7公斤,亩产121.1公斤;配施25公斤过磷酸钙后亩产上升到192.8公斤,增产58.3％。1981年后,在配方施肥的基础上又对施肥技术作了几点改进: 1.改无机氮磷配施为无机氮磷与有机肥配施。在土壤肥力较高(土壤碱解氮含量189.7ppm,速效磷4.1ppm)的情况下,亩施碳铵45公斤、过磷
In our district, there was little application of phosphate fertilizer, the soil was deficient in phosphorus, the available phosphorus content was less than 5ppm, accounting for 46.9%; the content of soil organic matter was low, averagely 1.41% in dry land and 0.33% less than in 1960s; Nitrogen fertilizer, many times the habit of dressing. From 1979 onwards, the experiment of formula fertilization of wheat has achieved remarkable results: 7 kg of pure nitrogen per mu and 121.1 kg of mu per mu were produced. After applying 25 kg of superphosphate, the yield per mu rose to 192.8 kg and the yield increased by 58.3%. After 1981, based on the formula fertilization and fertilization technology made a few improvements: 1. To change inorganic nitrogen and phosphorus with inorganic nitrogen and phosphorus fertilizer and organic fertilizer. In the case of higher soil fertility (189.7ppm of soil alkaline nitrogen content, available phosphorus 4.1ppm), 45 kg of ammonium bicarbonate, excessive phosphorus