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磷是作物生长发育必需的三大营养元素之一,在作物体内磷和氮是相互伴生,相互促进的。由于氮素化肥施用量的增加,作物氮素营养水平的提高,需要从土壤中吸收较多的磷。在一些不缺磷的土壤,也逐渐出现禾苗返黄坐蔸,施磷肥后,增产效果显著。所以,磷肥在我区广泛施用。不论绿肥、水稻,以及其它作物,施磷都具有一定的增产效果。但是,有的地方连年季季作物施用磷肥,单位面积上磷肥用量较多,而磷在土壤里的移动性小,流失较少。磷的贮量必然增多,再继续施用磷肥,效果就逐渐降低。为了经济合理施用磷肥,节约农业投资,对不同类型水稻土磷的含量进行分析,结合磷肥田间试验,针对性地施用磷肥,是提高磷肥效果的重要措施。
Phosphorus is one of the three essential nutrients required for crop growth and development. Phosphorus and nitrogen in crops are associated and mutually reinforcing. Due to the increase of nitrogen fertilizer application, the improvement of crop nitrogen nutrition needs to absorb more phosphorus from the soil. In some not phosphorus-deficient soil, but also gradually emerged grasses return to sit Huang, phosphate fertilizer, the yield is remarkable. Therefore, phosphate widely used in our area. Whether green manure, rice, and other crops, phosphorus has a certain yield increase. However, in some places, the application of P fertilizer to the crops in successive seasons has more phosphate fertilizer per unit area, while phosphorus has less mobility and less loss in the soil. Phosphorus storage will inevitably increase, and then continue to use phosphate fertilizer, the effect is gradually reduced. In order to economically and reasonably use phosphate fertilizer and save agricultural investment, the content of phosphorus in different types of paddy soils is analyzed, and in combination with the field experiment of phosphate fertilizer, the targeted application of phosphate fertilizer is an important measure to increase the effect of phosphate fertilizer.