Impact of N Application on the Yield of Alfalfa,N Accumulation and Nitrogen Use Efficiency

doi:10.7668/hbnxb.2014.06.037

Abstract

Abstract: This study was to evaluate the impact of N application on the yield of alfalfa(one of the major feedstuffs),nitrogen(N)accumulation and N use efficiency with five treatments including CK,chemical N fertilization(CF),chemical N and cattle manure(DM1),chemical N fertilizer and digestate(DT),reduced chemical N fertilization and cattle manure(DM2).Results showed that N fertilization not only enhanced the yields and N accumulation of alfalfa,also might have a potential of reducing the period among two cuttings and increased the total cuttings during a year;Meanwhile,application of organic manure or digestate can further increased the yield but it cannot replace the chemical N fertilization.Furthermore,it was found that the N use efficiency of chemical N fertilizer was 46.7%-48.1%,9.1% for cattle manure and 13.8% for digestate,indicating the N use efficiency of organic fertilizer was lower than chemical N fertilizer.

Key words: Alfalfa, In-organic and organic N fertilization, Biomass yield, Nitrogen accumulation, N use efficiency

CLC Number:

S143.1

HAN Si-xun, WANG Sen, GAO Zhi-ling, WANG Dian-wu. Impact of N Application on the Yield of Alfalfa,N Accumulation and Nitrogen Use Efficiency[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(6): 220-225. doi: 10.7668/hbnxb.2014.06.037.

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http://www.hbnxb.net/EN/Y2014/V29/I6/220

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