文献类型： 外文期刊

作者： Xu, Z. ¹ ; Wan, Ch. ¹ ; Xu, X. ² ; Feng, X. ¹ ; Xu, H. ¹ ;

作者机构： 1.Nanjing Univ Technol, Coll Food Sci & Light Ind, State Key Lab Mat Oriented Chem Engn, Nanjing 211816, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Agr Resource & Environm Sci, Nanjing 210014, Jiangsu, Peoples R China

关键词： Poly (gamma-glutamic acid);fertilizer synergist;N use efficiency;soil microbial biomass nitrogen;soil enzyme

期刊名称：JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION （ 影响因子：3.872； 五年影响因子：3.771 ）

ISSN： 0718-9516

年卷期： 2013 年 13 卷 3 期

页码：

收录情况： SCI

摘要： Recently, with numerous environmental problems being caused by chemical fertilizer overuse, agricultural practices are shifting toward the development of environmentally friendly N fertilizers. In this study, pot and field experiments were simultaneously conducted to investigate the effect of poly (gamma-glutamic acid) (gamma-PGA) on the yield, N use efficiency, and soil microenvironment of wheat. Our study demonstrates a statistically significant increase in winter wheat, number of tillers, seed number per spike, yield, soil microbial biomass N (SMBN), and soil enzymes after gamma-PGA application. The highest grain yield of 7435.69 +/- 55.91 kg ha(-1) was obtained after gamma-PGA application in the field experiment, which was 7.17% higher than the urea control. The N recovery efficiency increased by 11.81%-14.00% and 11.30%-11.38% after the application of gamma-PGA in pot and field experiments, respectively. More mineral nitrogen in soil was immobilized by the microbes after gamma-PGA application at the early growth stage of wheat. The immobilized nitrogen was gradually released at the late growth stage. The results demonstrate that gamma-PGA can be used as a fertilizer synergist.