Impacts of long-term chemical and organic fertilization on soil puddlability in subtropical China

文献类型： 外文期刊

第一作者： Bi, Lidong

作者： Bi, Lidong;Yao, Shuihong;Zhang, Bin

作者机构：

关键词： Puddling tillage;Sinkage resistance;Soil clods;Long-term fertilization;Rice

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 measures the susceptibility of a soil to puddling, and can influence transplantation and the growth of rice plants. The effects of chemical fertilizers and organic amendments on soil puddlability of paddy soils are poorly understood. This study used two 26-year field experiments (1) to compare the effects of chemical and organic fertilization on soil puddlability by measuring sinkage resistance and hard clod content after puddling, (2) to characterize physical properties of hard clods and (3) to explain the change in soil puddlability. Each of the two experiments consisted of nine treatments of chemical fertilizers alone or in combination with organic amendments. The sinkage resistance and the content of hard clods were higher in the treatments with chemical fertilization alone than in the treatments with organic amendments. The sinkage resistance was positively correlated with the content of hard clods and negatively correlated to content of soil organic C (SOC) and mean weight diameter (MWD). The bulk density, water sorptivity and apparent porosity were similar among individual hard clods from different treatments, suggesting that the hard clods were formed under the same processes. The formation of hard clods was likely attributed to the breakdown of the compacted topsoil by puddling tillage, which formed due to clogging pores by fine particles produced during previous puddling tillage and due to shrinkage upon drying during rice growth period. Compared with the organic amendment treatments, the chemical fertilization treatments contained more and larger hard clods, indicating that the compacted topsoil was thicker due to higher soil dispersibility due to N fertilization and lower SOC content in the chemical fertilization treatments than in the organic amendment treatments. The study also suggests that continuous input of organic Cat an annual rate of >2.5 Mg ha(-1) is needed to maintain SOC content and soil structure under chemical fertilization in the study region. (C) 2015 Elsevier B.V. All rights reserved.

分类号： S1

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