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据我省第二次土壤普查结果,全省土壤缺磷面积占71%,缺钾面积占42.7%,1984年我省小麦氮磷钾配方施肥面积达1146万亩,占小麦播种面积的55.6%,均取得了明显的增产效果。就我们试验看,具体表现为“两增一提高”。(1) 增产:NPK配方施肥的小麦单产540.0—573.3斤,比NP配方每亩增产小麦56.7—90斤,比NK配方每亩增产小麦113.4—146.7斤,增产分别达显著和极显著程度;(2) 增收:NPK配方施肥的小麦每亩净收入99.90—107.36元,比NP配方每亩增收10.3—17.76元,比NK配方每亩增收20.15—27.61元;(3) 提高氮肥利用率:据测定,氮肥利用率,单施N为29%,N+P为30.8%,N+K为41.4%,N+P+K为52.5%。
According to the results of the second soil survey in our province, the province’s soil phosphorus area accounted for 71%, potassium area accounted for 42.7%, 1984 wheat nitrogen, phosphorus and potassium formula fertilization area of 1146 acres, accounting for 55.6% of wheat sown area, , Have achieved significant yield increase. In our experiments, the concrete manifestation is “two increases and one increase.” (1) Production increase: The yield of wheat in NPK formula fertilization was 540.0-573.3 kg, 56.7-90 kg more than that of NP formula, and 113.4-146.7 kg more than that of NK formula. The yield increase reached significant and extremely significant level respectively. 2) Increasing income: The net income per mu of NPK formula fertilizing wheat is 99.90-107.36 yuan, which is 10.3-17.76 yuan more than that of NP formula and 20.15-27.61 yuan more than that of NK formula. (3) Increasing nitrogen utilization rate: According to the determination , Nitrogen use efficiency, N = 29%, N + P = 30.8%, N + K = 41.4% and N + P + K = 52.5%.