Plant Soil Environ., 2018, 64(11):517-522 | DOI: 10.17221/371/2018-PSE

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

Lin CHEN1, Liangjun FEI*,1, Zilu WANG2, Mohamed Khaled SALAHOU3, Le LIU1, Yun ZHONG1, Zhiguang DAI1,4
1 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
2 Yellow River Institute of Hydraulic Research, Zhengzhou, P.R. China
3 State Key Laboratory of Hydrology-Water Resource and Hydraulic Engineering, Hohai University, Nanjing, P.R. China
4 School of Hydraulic and Ecological Engineering, Nanchang Institute of Technology,

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

Published: November 30, 2018  Show citation

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CHEN L, FEI L, WANG Z, SALAHOU MK, LIU L, ZHONG Y, DAI Z. The effects of ploy (γ-glutamic acid) on spinach productivity and nitrogen use efficiency in North-West China. Plant Soil Environ.. 2018;64(11):517-522. doi: 10.17221/371/2018-PSE.
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