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| DOI：10.13522/j.cnki.ggps.2019431 |
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| Modelling the Effect of Tillage on Soil Water Dynamics in Corn Field |
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DING Chaoming, WU Pengnian, YUE Ling, LI Yuhua, GUAN Xiaokang, WANG Tongchao
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1. Henan Agricultural University, Zhengzhou 450046, China;2. College of Life Science, Zhengzhou Normal University, Zhengzhou 450044, China
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| Abstract: |
| 【Background】The Huang-Huai-Hai plain is one of the most important agricultural bases in China, but water shortage and low water use efficiency has inhibited its sustainable production. Developing water-saving agronomic practices is hence critical to safeguard grain production in this region.【Objective】This paper presents the results of a study on impact of different tillages on soil water dynamic in corn field based on experiments and numerical modelling in attempts to provide guidance to improving water use efficiency of the limited water resources in this region.【Method】The study was based on a long-term experiment set up to compare the impact of continuous deep tillage, alternate tillage (two years of no-tillage followed by a deep-tillage) and continuous no-tillage on properties and functions of soil in a corn field. The experiment measured soil moisture content and soil evaporation at seedling stage, extraction stage, grout stage and mature stage, respectively. These data were used to calibrate the Hydrus-1D model, and the calibrated model was then used to simulate soil moisture dynamics under these tillages.【Result】Alternate tillage and no-tillage could both significantly improve soil water storage during the period from extraction stage to grouting stage; the difference in surface runoff between different tillages was not significant. Alternate tillage and no-tillage increased water leaching slightly but reduced soil surface evaporation by 12.84% and 5.07%, increased transpiration by 15.15% and 19.44%, and root uptake by 14.18% and 15.09% respectively, compared to the conventional tillage.【Conclusion】Alternating no-tillage and deep-tillage and continuous no-tillage can both significantly improve water distribution in soil and bioavailability of soil water for the summer maize to take. They also increased water infiltration and root water uptake, thereby improving water use efficiency due to the reduction in evaporation-transpiration ratio. |
| Key words: tillage; summer maize; evapotranspiration; root water uptake; Hydrus-1D model |
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