期刊
CATENA
卷 137, 期 -, 页码 70-76出版社
ELSEVIER
DOI: 10.1016/j.catena.2015.08.014
关键词
Irrigation; Traditional tillage; Subsoil compaction; Freezing/thawing cycles; Wetting/drying cycles
资金
- National Natural Science Foundation of China [31171511]
- National Scientific Supporting Project [2013BAD051302]
- Sino-German Center for Research Promotion (SGC) [GZ 1149]
An adjusted irrigation regime may help to minimize the risk of soil compaction, which is a major yield constraining factor in global crop production, constituting a serious issue in the winter wheat-summer maize double cropping system of the North China Plain. Thus this study aimed to evaluate the natural changes of soil penetration resistance (PR) and soil bulk density (BD) caused by freezing/thawing (FT) and wetting/drying (WD) cycles. This was tested under full irrigation (FI) and deficit irrigation (DI) over three double cropping seasons from 2011 to 2014, following a conventional tillage sequence of shallow, deep and shallow tillage before the first, second and third season, respectively. The results showed that in the deeper soil layer FT during winter reduced the PR by 22.9%, 34.7% and - 18.7% under FI for the three seasons, respectively. The values under DI were 4.5%, 8.0% and - 33.8% for the three seasons, respectively. However the compaction alleviating effects due to FT were only of temporary nature. Furthermore FI caused a stronger recompaction after deep tillage compared to DI, mainly attributed to increased slumping of soil. On the contrary DI reduced the BD by 8.4% in the deep soil layer by fostering intensive cycles of WD over the three double cropping seasons. Results also showed that DI resulted in a higher physical quality of subsoil, expressed by the value of S, compared to FI It was concluded that irrigation intensity should be reduced after deep tillage to minimize and slow down subsequent recompaction. (C) 2015 Elsevier B.V. All rights reserved.
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