The effects of ploy (γ-glutamic acid) on spinach productivity and nitrogen use efficiency in North-West China

Lin Chen, Liangjun Fei, Zilu Wang, Mohamed Khaled Salahou, Le Liu, Yun Zhong and Zhiguang Dai
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Lin Chen: State Key Laboratory of Ecological Water Resource in Northwest Arid Region Co-sponsored by Province and Ministry, Xi'an University of Technology, Xi'an, P.R. China
Liangjun Fei: State Key Laboratory of Ecological Water Resource in Northwest Arid Region Co-sponsored by Province and Ministry, Xi'an University of Technology, Xi'an, P.R. China
Zilu Wang: Yellow River Institute of Hydraulic Research, Zhengzhou, P.R. China
Mohamed Khaled Salahou: State Key Laboratory of Hydrology-Water Resource and Hydraulic Engineering, Hohai University, Nanjing, P.R. China
Le Liu: State Key Laboratory of Ecological Water Resource in Northwest Arid Region Co-sponsored by Province and Ministry, Xi'an University of Technology, Xi'an, P.R. China
Yun Zhong: State Key Laboratory of Ecological Water Resource in Northwest Arid Region Co-sponsored by Province and Ministry, Xi'an University of Technology, Xi'an, P.R. China
Zhiguang Dai: State Key Laboratory of Ecological Water Resource in Northwest Arid Region Co-sponsored by Province and Ministry, Xi'an University of Technology, Xi'an, P.R. China

Plant, Soil and Environment, 2018, vol. 64, issue 11, 517-522

Abstract: Recently, with the problem of low utilization rate of nitrogen fertilizers in farmland, agriculture practices have shifted towards the development of environmentally friendly nitrogen fertilizers. Ploy (γ-glutamic acid) is a new plant growth regulator with characteristics of water and fertilizer conservation. In this study, pot experiments were conducted to investigate the effects of ploy (γ-PGA) on the yield, nitrogen use efficiency and soil aggregate of spinach (Spinacia oleracea L.). The results indicated that γ-PGA (0.1%) increased plant growth (as measured by fresh and dry plant weight). However, increasing γ-PGA significantly decreased spinach quality parameters. The nitrogen utilization and use efficiency were increased with increasing γ-PGA. Ploy was stronger in water coagulation which effectively increased soil porosity and improved soil structure. The results suggest that 0.1% of γ-PGA has positive effects on spinach growth.

Keywords: soil amelioration; spinach N uptake; spinach yield; N fertilization; soil water-stability of aggregates (search for similar items in EconPapers)
Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:64:y:2018:i:11:id:371-2018-pse

DOI: 10.17221/371/2018-PSE

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