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Effects of straw mulching on the soil aggregates in dryland wheat field under no-tillage.
- Source :
- Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao; Apr2012, Vol. 23 Issue 4, p1025-1030, 6p, 1 Chart, 4 Graphs
- Publication Year :
- 2012
-
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<superscript>-2</superscript> 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 (DR<subscript>0.25</subscript>) and of >0.25 mm water stable aggregates (WR<subscript>0.25</subscript>) 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<superscript>-2</superscript> of straw mulching. Straw mulching increased the soul organic matter content, and the latter had a significant positive correlation with the WR<subscript>0.25</subscript> content. All the straw mulching treatments decreased the soil unstable aggregate index (ELT) which was the lowest in treatment 6000 kg · hm<superscript>-2</superscript> 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<superscript>-2</superscript> had the best effect, being a reasonable straw mulching mode to be applied in the agricultural production in Weibei Loess Plateau. [ABSTRACT FROM AUTHOR]
Details
- Language :
- Chinese
- ISSN :
- 10019332
- Volume :
- 23
- Issue :
- 4
- Database :
- Supplemental Index
- Journal :
- Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao
- Publication Type :
- Academic Journal
- Accession number :
- 75377367