Effects of rice straw incorporation and tillage depth on soil puddlability and mechanical properties during rice growth period

文献类型： 外文期刊

第一作者： Yao, Shuihong

作者： Yao, Shuihong;Teng, Xiaolong;Zhang, Bin

作者机构：

关键词： Sinkage resistance;Penetration resistance;Tensile strength;Shrinkage capacity;Wetting and drying cycles;Paddy soil

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：5.374； 五年影响因子：6.368 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Soil puddlability, a measure of susceptibility of soil to puddling, affects regeneration of soil structure during the rice growth period, but the intrinsic controlling factors are unclear. It was hypothesized that rice straw incorporation and tillage depth influence soil puddlability and soil mechanical and hydraulic properties during the rice growth period as they influence soil organic carbon (SOC) in the plough layer. Using a three-year experiment, the objectives of this study were (1) to determine the effects of rice straw incorporation and tillage depth on root growth traits, sinkage resistance after puddling, and tensile strength, shrinkage capacity, water retention curve and penetration resistance during the rice growth period, and (2) to determine whether mechanical properties from puddling tillage, through the rice growth period, to harvest are correlated with SOC concentration. Rice straw was incorporated partially (Cl) and fully (C2) to different depths of plough layer by shallow tillage (ST) and deep tillage (DT). Compared with no rice straw incorporation (CO), rice straw incorporation decreased the sinkage resistance after puddling (C2 < C1 < CO) and increased SOC concentration and aggregate stability. Shallow tillage increased the penetration resistance more than deep tillage irrespective of rice straw incorporation. The difference in tensile strength and total porosity were small among the rice incorporation treatments at the 1st drainage (C2 > C1 > CO), but became more profound with increasing number of drainage because the tensile strength and total porosity decreased in CO, increased in C2, particularly under ST. The root weight was lower, and the root length was longer in Cl than in C2 particularly at the deeper depth of the plough layer under ST, suggesting the impedance of root growth due to higher sinkage and penetration resistances. SOC concentration was weakly correlated with the sinkage and penetration resistances and the tensile strength after the 1st drainage, but not with the tensile strength after the 2nd and 3rd drainages. In conclusion, rice straw incorporation is important to maintain SOC and then improve soil puddlability and the recovery of pore structure during the rice growth period. (C) 2014 Elsevier B.V. All rights reserved.

分类号： S1

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