一、为什么要“以磷增氮”我国磷肥資源非常丰富,磷矿分布遍及全国,这为我国农业生产的发展,提供了一項极其重要的肥源。磷肥肥效各地反映不一,有的地区和单位,施用磷肥能收到一定的增产效果,但多数地区和单位,施用磷肥效果不显著,因此,目前磷肥还没有在生产上广泛施用。农业科学研究結果証明:磷肥肥效因土壤、作物和施用技术不同而异。我省磷肥試验资料表明:磷肥肥效在酸性土壤上高于中性、碱性土壤;缺鈣土壤高于合鈣土壤;在豆科作物上高于禾本科作物;直根性作物高于須根性作物;作种肥、基肥的高于不作种肥和基肥的;与有机肥、氮肥混用的高于单施的;迟效配合速效的高于不配合的……等 First, why should “increase nitrogen by phosphorus” China’s phosphate fertilizer resources are very rich, phosphate distribution throughout the country, which for the development of China’s agricultural production, providing an extremely important source of fertilizer. Phosphate fertilizer efficiency varies from place to place. In some areas and units, the application of phosphate fertilizer can receive a certain stimulation effect. However, in most areas and units, the effect of applying phosphate fertilizer is not significant. Therefore, at present, phosphate fertilizer has not been widely used in production. Agricultural science research results show that: fertilizer efficiency due to soil, crop and application techniques vary. According to the experimental data of phosphate fertilizer in our province, the fertilizer efficiency of phosphate fertilizer is higher than that of neutral soil and alkaline soil in acid soil, that of calcium deficiency soil is higher than calcium soil, higher than that of gramineous crops in leguminous crops, ; As a kind of fertilizer, the base fertilizer is higher than the non-seed fertilizer and basal fertilizer; and organic fertilizer, nitrogen fertilizer is higher than the single application;