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Wang X.-J.,Northwest University, China | Wang X.-J.,Key Laboratory of Crop Physio ecology and Tillage Science in Northwestern Loess Plateau | Jia Z.-K.,Northwest University, China | Jia Z.-K.,Key Laboratory of Crop Physio ecology and Tillage Science in Northwestern Loess Plateau | And 9 more authors.
Chinese Journal of Applied Ecology | Year: 2012

A four-year(2007-2010) field experiment was conducted to study the effects of applying different amounts(7500, 15000, and 22500 kg·hm-2) of organic manure on the organic matter content, aggregate particle size distribution, and aggregate stability in different soil layers in a continuously cropped maize field on the Weibei Dry Land, Shaanxi Province of Northwest China. In 0-20 cm soil layer, the organic matter content in treatment 22500 kg·hm-2 of organic manure was 4.1% -4.6% higher than that in treatment 7500 kg·hm-2 of organic manure(P<0.05), and the organic matter content in treatments 15000 and 22500 kg·hm-2 of organic manure was 4.6%-11.2% higher than that in CK(chemical fertilization)(P<0.05). In the fourth year(2010) of applying 7500 kg·hm-2 of organic manure, the organic matter content in 0-20 cm soil layer was 4.7%-6.3% higher than that of CK(P<0.05). In 0-30 cm soil layer, all treatments with organic manure application had an increased amount of soil water stable aggregates(>5 mm), and the amount of the aggregates increased significantly with the increasing application rate of organic manure. Applying organic manure increased the amount of soil water stable aggregates(>0.25 mm), aggregate mean mass diameter, and aggregate stability in 0-30 cm soil layer, as compared with CK, and these three indices increased significantly with increasing organic manure application rate.

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