复合肥的掺混除以磷酸铵为母体外,也有以硝磷酸铵为母体,这种复合肥所含的氮素约45%为硝酸态氮。硝酸磷肥以其生产成本低,不耗费硫酸而显示其优点,我国亦正扩充这类肥料的生产。但是,由于一向认为硝态氮在稻田,尤其南方稻田中易于流失,以及受反硝化作用而脱氮吸收利用率低等原因,至今没有在南方稻田上使用。然而,国外在60年代后期至70年代,经过大量田间试验证明,尽管硝态氮和铵态氮在土壤中的行为,以及水稻对这两种形态的氮素吸收利用有所不同,而其肥效则是一致的,并肯定可在稻田使用。随后我国也经过广泛的 Addition of compound fertilizer divided by ammonium phosphate as the mother, but also to ammonium nitrate as the parent, this compound fertilizer contains about 45% of nitrogen nitrate nitrogen. Nitrophosphate fertilizer shows its merit with its low production cost and no sulfuric acid consumption. Our country is also expanding the production of such fertilizers. However, it has not been used in paddy fields in the South until now due to the tendency of nitrate nitrogen to be easily lost in paddy fields, especially in southern paddy fields, and due to the low denitrification absorption and utilization rate. However, in the late 1960s to the 1970s, lots of field experiments abroad proved that although nitrate nitrogen and ammonium nitrogen behave in the soil and the nitrogen uptake and utilization of rice in these two forms is different, It is consistent, and certainly can be used in paddy fields. Then our country has also been extensive