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

Author:
Huang, Min, Jiang, Peng, Zhou, Xuefeng, Zou, Yingbin
Source:
Weed biology and management 2018 v.18 no.3 pp. 105-109
ISSN:
1444-6162
Subject:
aboveground biomass, conventional tillage, demonstration farms, ecosystem services, fallow, field experimentation, nitrogen, nitrogen content, no-tillage, rice, soil, weeds, China
Abstract:
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.
Agid:
6117445