2013•Dongbei Nongye Daxue xuebaoRequires access
Comparative research of evaluation nitrogen fertilizer efficiency between nitrogen use efficiency and fertilizer yield method
Wei Zhou
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Abstract
Fertilizer use efficiency and N fertilizer yield were calculated and valued in long-term fertilizer experiment,common fertilizer experiment and tracing experiment using data of wheat N fertilizer efficiency experiment in Henan Province based on the ecological balanced fertilization theory and universal model.Results showed that: ① N use efficiency and N fertilizer yield were stable in long-term fertilizer experiment;N use efficiency and N fertilizer yield in common fertilizer experiment were similar with that in long-term fertilizer experiment under optimum fertilization in common fertilizer experiment,but N use efficiency varied a lot under different experiments in common fertilizer experiment;N use efficiency or fertilizer yield coming from tracing experiment can not be scientific base of evaluating fertilizer efficiency and guiding fertilization;② N use efficiency underestimated N fertilizer efficiency and overestimated N fertilizer efficiency under no considering external N;using N fertilizer yield and external N was the method of scientific evaluation N fertilizer efficiency;③ using N fertilizer relative conversion to evaluate fertilizer efficiency and guide fertilization not considering external N when concrete practicing fertilization;guidance fertilization semi-quantitatively can be realized by referencing optimum nitrogen application rate of long-term experiment even without determining soil N using N fertilizer yield.