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- Title
Effects of straw mulching on the soil aggregates in dryland wheat field under no-tillage.
- Authors
Wang Hai-Xia; Sun Hong-Xia; Han Qing-Fang; Wang Min; Zhang Rui; Jia Zhi-Kuan; Nie Jun-Feng; Liu Ting
- Abstract
A field experiment was conducted to study the effects of full period and growth period straw mulching with an amount of 3000, 6000, and 9000 kg · hm-2 on the soil aggregates in a no-tillage dryland wheat field in Weibei Loess Pleateau of Shaanxi Province, taking no full period straw mulching as the control. In the o-40 cm soil layers, the content of >5 mm aggregates increased with depth, while that of 5< mm aggregates was in adverse. Under straw mulching, the total contents of >0.25 mm mechanical stable aggregates (DR0.25) and of >0.25 mm water stable aggregates (WR0.25) were significantly higher than the control, with an increase of 13.0%-26.4% and 18.6%-45.6%, respectively and the largest increment in the treatment 6000 kg · hm-2 of straw mulching. Straw mulching increased the soul organic matter content, and the latter had a significant positive correlation with the WR0.25 content. All the straw mulching treatments decreased the soil unstable aggregate index (ELT) which was the lowest in treatment 6000 kg · hm-2 of straw mulching. This study showed that straw mulching could increase the >0.25 mm aggregates and organic matter contents in 0-40 cm soil layer and improve the soil structural stability and mulching with an amount of 6000 kg · hm-2 had the best effect, being a reasonable straw mulching mode to be applied in the agricultural production in Weibei Loess Plateau.
- Subjects
EXPERIMENTAL agriculture; MULCHING; SOIL management; NO-tillage; HUMUS; ORGANIC compounds; SOIL structure
- Publication
Yingyong Shengtai Xuebao, 2012, Vol 23, Issue 4, p1025
- ISSN
1001-9332
- Publication type
Article