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Acta Prataculturae Sinica ›› 2016, Vol. 25 ›› Issue (3): 245-250.DOI: 10.11686/cyxb2015201

• Orginal Article • Previous Articles     Next Articles

Decomposition characteristics of a Vulpia myuros cover crop in an orchard soil and its effect on N supply

LIANG Bin1, DONG Jing2, SUI Fang-Gong1, LIU Qing-Hua1, LI Jun-Liang1, *   

  1. 1.Collage of Resources and Environment, Qingdao Agriculture University, Qingdao 266109, China;
    2.Shouguang Agricultural Bureau, Shouguang 262700, China
  • Received:2015-04-17 Online:2016-03-20 Published:2016-03-20

Abstract: Cover cropping in orchard is an efficient soil management technique for improving soil fertility and reducing soil erosion. However, the effect of cover crops on nutrient supply is not well understood and a concern for growers. An experiment was conducted to investigate the decomposition characteristics of a cover crop (Vulpia myuros) and its effect on N supply in orchard soil. The decomposable organic C in straw of V. myuros accounted for 51% of organic C; the remainder increased soil C sequestration by 1 t/ha per year. Application of exogenous N fertilizer had no effect on annual net C sequestration, although it increased the decomposition rate of V. myuros straw. During decomposition, immobilized N ranged from 39-65 mg/kg. Consequently an additional 60-100 kg N/ha should be applied during V. myuros decomposition in low fertility soils in the first few years to avoid competition between soil microbes and crop trees, and to improve soil fertility.