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| Effects of subsoiling tillage on soil physical properties and infiltration characteristics |
| WANG Wanning, QIANG Xiaoman, LIU Hao, LI Wenxing, SUN Jingsheng* |
| Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences/ Ministry of Agriculture Key Laboratory of Crop Water Requirement and Regulation, Xinxiang, Henan453002, China |
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Abstract Subsoiling tillage(PS)is beneficial to improve soil structure and permeable capacity. To explore effects of PS on soil physical properties and soil moisture infiltration characteristics, field experiment was carried out under two conditions, namely subsoiling+PS and conventional tillage(CK), i.e. PS only, then soil bulk density, soil compaction, moisture content, saturated hydraulic conductivity and soil infiltration parameters were measured by making use of double-ring and the Aardvark Permeameter Module(APM)in various growth stages of winter wheat in North China Plain. The results showed that the soil bulk density and compaction were decreased in PS treatment by 6.58% and 31.29% and the soil moisture was increased by 12.11% compared to CK in 0-40 cm soil layer in the whole growth period. The soil saturated hydraulic conductivity was significantly increased by 116.65% and 83.69% in subsoiling(20, 40 cm)+PS treatments, but increased by 8.25% subsoiling(60 cm)+PS treatment in comparison with CK treatment. The soil initial, sTab. infiltration and accumulative infiltration rates were well improved by 21.52%, 31.75% and 11.56% before irrigation and by 61.54%, 68.42% and 12.63% after irrigation higher in subsoiling(20, 40 cm)+PS treatments than in CK treatment. The infiltration experiments were compared in terms of four infiltration models. The Kositiakov infiltration model could better fit every set of experimental data with a correlation coefficient between 0.92 and 0.96. The infiltration coefficient a and infiltration index b before and after border irrigation were obtained. The results in the paper has provided a reference for border irrigation simulation and determination of optimal technical parameters of irrigation in different tillage modes.
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Received: 06 April 2018
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