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No-tillage increases nitrogen scavenging by fallow weeds in a double-season rice cropping system in China

文献类型： 外文期刊

作者： Huang, Min 1 ; Jiang, Peng 1 ; Zhou, Xuefeng 1 ; Zou, Yingbin 1 ;

作者机构： 1.Hunan Agr Univ, Sothern Reg Collaborat Innovat Ctr Grain & Oil CI, 1 Nongda Rd, Changsha 410128, Hunan, Peoples R China

2.Sichuan Acad Agr Sci, Inst Rice & Sorghum, Luzhou, Peoples R China

关键词： fallow season; Japanese foxtail; rice field; soil tillage; weed N uptake

期刊名称：WEED BIOLOGY AND MANAGEMENT （ 影响因子：1.059； 五年影响因子：1.276 ）

ISSN： 1444-6162

年卷期： 2018 年 18 卷 3 期

页码：

收录情况： SCI

摘要： Naturally occurring fallow weeds are an alternative strategy for reducing nitrogen (N) loss from annual cropping systems by scavenging inorganic N from the soil. Soil tillage is a major factor affecting the growth of weed populations. This study was carried out to determine the effect of a no-tillage (NT) system on the N scavenging capacity of fallow weeds in a double-season rice cropping system. A fixed field experiment was carried out at the Experimental Farm of Hunan Agricultural University, Hunan Province, China, from 2008 to 2011. The results indicated that NT had 80% greater aboveground biomass of fallow weeds than conventional tillage (CT). There was no significant difference in N concentration in fallow weeds between NT and CT. N uptake by fallow weeds was 82% higher under NT than under CT. The stem density of fallow weeds was 50% higher under NT than under CT. The difference in the single-stem biomass of fallow weeds was not significant between NT and CT. These results suggest that the N scavenging capacity of fallow weeds in the double-rice cropping system can be increased by increasing the stem density and aboveground biomass through the adoption of NT farming. Our study identifies a potential new ecosystem service provided by NT farming.

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