【摘要】 氮肥利用率是关系到施肥、农产品生产和环境保护的重要指标,计算氮肥利用率的差减法与示踪法都存在有待进一步研究的问题,计算的氮肥利用率结果都偏低。分别总结了差减法和示踪法测定氮肥利用率的应用及计算方法,示踪法能够研究氮肥在土壤中的转化及移动问题,但是测定的氮肥利用率仅仅是15N的吸收利用率,是氮肥利用率的一个部分,不能代表氮肥的吸收利用率。详细论述了差减法计算氮肥利用率结果偏低的原因,还对已有的改进方法作了介绍和评述,提出了进一步改进的原则。更多还原

【Abstract】 The fertilizer nitrogen recovery rate was important to the fertilization,agricultural production and environmental protection.Both subtraction method and 15N tracer method should be further studied.The results calculated by customarily method of fertilizer nitrogen recovery rate was low.Here was a summary of the 15N tracer and subtraction calculation methods and the application of fertilizer nitrogen recovery rate.15N tracer method could be easily used to study nitrogen transformation and movement in soil,but was not adequate for the determination of fertilizer nitrogen recovery rate.Subtraction calculation method was discussed in detail for the reasons of low fertilizer nitrogen recovery rate results.A review on the improvement of the existing calculation methods was put forward.And several principles to improve the calculation methods were also mentioned.更多还原