Effect of Orychophragmus violaceus incorporation on nitrogen uptake in succeeding maize

L. Yang, W. Cao, K. Thorup-Kristensen, J. Bai, S. Gao and D. Chang
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L. Yang: Graduate School, Chinese Academy of Agricultural Sciences, Beijing, P.R. China
W. Cao: Graduate School, Chinese Academy of Agricultural Sciences, Beijing, P.R. China
K. Thorup-Kristensen: Department of Agriculture and Ecology, Faculty of Life Sciences, University
J. Bai: Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, P.R. China
S. Gao: Graduate School, Chinese Academy of Agricultural Sciences, Beijing, P.R. China
D. Chang: Graduate School, Chinese Academy of Agricultural Sciences, Beijing, P.R. China

Plant, Soil and Environment, 2015, vol. 61, issue 6, 260-265

Abstract: Winter Orychophragmus violaceus (OV)/spring maize is a novel eco-agricultural system in North China Plain, but little is known about OV's nitrogen (N) effects on succeeding maize growth and its contribution to maize N uptake and utilization during the growth. A pot experiment using 15N was conducted, including five treatments: (1) Control - without OV incorporation and N fertilizer; (2) G - high 15N labelled-OV incorporation; (3) 50%G - lower 15N labelled-OV incorporation; (4) F - 15N labelled urea fertilizer merely; (5) G + F - high OV incorporation combined with urea fertilizer. Increasing OV incorporation rate increased maize dry matter, yield, and total N uptake. Approximately 84-97% of the released OV's nitrogen was absorbed before the V8 (the 8th leaf fully expanded) stage in G and 50%G treatments. However, only 19% of the released OV's nitrogen was taken up at this period in G + F, and the rest was absorbed from V8 to maturity. G treated maize doubled the OV's nitrogen uptake than the 50%G at maturity, and also had higher percentage contribution of OV's N to total N accumulation. The G and 50%G maize obtained similar OV's nitrogen use efficiency of 30%; however, this efficiency was further improved to 43% in the G + F. And more, G + F treatment further improved the maize yield by 9% compared to F treatments.

Keywords: green manure; nitrogen sources; Zea mays L.; cover crops (search for similar items in EconPapers)
Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:61:y:2015:i:6:id:178-2015-pse

DOI: 10.17221/178/2015-PSE

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