No‐tillage increases nitrogen scavenging by fallow weeds in a double‐season rice cropping system in China,Weed Biology and Management

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No‐tillage increases nitrogen scavenging by fallow weeds in a double‐season rice cropping system in China
Weed Biology and Management ( IF 1.4 ) Pub Date : 2018-06-28 , DOI: 10.1111/wbm.12152
Min Huang ₁ , Peng Jiang _{1,

2} , Xuefeng Zhou ₁ , Yingbin Zou ₁

Affiliation

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.

更新日期：2018-06-28

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