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[1]HE Shaolang,HUANG Shangshu,ZHONG Yijun,et al.Effects of Tillage Depth on the Characteristics of Soil Water-Stable Aggregates in Sloping Farmland of Red Soil[J].Research of Soil and Water Conservation,2019,26(06):127-132.

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Effects of Tillage Depth on the Characteristics of Soil Water-Stable Aggregates in Sloping Farmland of Red Soil

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 06 Page number: 127-132 Column: Public date: 2019-10-17

Title:: Effects of Tillage Depth on the Characteristics of Soil Water-Stable Aggregates in Sloping Farmland of Red Soil

Author(s):: HE Shaolang¹, HUANG Shangshu¹, ZHONG Yijun^1,2, HUANG Qianru¹, CHENG Yanhong¹, ZHANG Kun¹, WU Lin¹, LI Xiaofei¹, YE Chuan³; 1. Jiangxi Institute of Red Soil, Nanchang 330046, China;
2. College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China;
3. Jiangxi Sericulture and Tea Research Institute, Nanchang 330202, China

Keywords:: tillage depth; sloping farmland of red soil; soil water-stable aggregate; aggregates stability

CLC:: S152.4

DOI:: -

Abstract:: In order to investigate the effects of tillage depth on the characteristics of water-stable aggregates of Quaternary red clay soil, the positioning field experiment was conducted from 2015 to 2017. The experiment was designed into four treatments, including no-tillage (NT), tillage 10 cm (P₁₀), tillage 20 cm (P₂₀) and tillage 30 cm (P₃₀). Soil samples were collected from the 0~15 cm and 15~30 cm soil layers of the plots of the four treatments. proportions of the aggregate sizes of 2~8 mm, 0.25~2 mm, 0.053~0.25 mm and <0.053 mm were determined by using the wet screening method., The amount of>0.25 mm aggregate (R_0.25), mean weight diameter (MWD), mean geometric diameter (GMD) and fractal dimension (D) of the fractions of soil aggregates were calculated, respectively. The results showed that the content of soil aggregate of 0.25~2 mm particle was the highest under the all experimental treatments, followed by the size of 0.053~0.25 mm; compared to NT, the content of soil aggregate of>2 mm decreased significantly under the treatments of P₁₀, P₂₀ and P₃₀ (p<0.05), and the content of microaggregate (<0.25 mm) increased under the treatments of P₁₀ and P₃₀ as a whole; the microaggregate (<0.25 mm) content changed little under P₂₀ treatment. The values of R_0.25, MWD, and GMD of the aggregates under NT and P₂₀ treatments were higher than those of P₁₀ and P₃₀, and values of D of soil aggregates under NT and P₂₀ treatments were lower than those of P₁₀ and P₃₀. It was indicated that the stability of soil aggregates under NT and P₂₀ treatment were more stable than P₁₀ and P₃₀ treatments. In addition, the peanut yield was significantly positively correlated with the content of soil aggregate of 0.25~2 mm under the treatment of P₁₀, P₂₀ and P₃₀ (p<0.01), and was significantly positively correlated with the values of R_0.25 and GMD of the aggregates (p<0.05). It could thus be concluded that the content of soil water-stable aggregate of 0.25~2 mm could be used as the physical indicator to evaluate fertility of red soil sloping field, and the values of R_0.25 and GMD of the aggregates could well indicate the soil fertility.

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