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| DOI：10.13522/j.cnki.ggps.20180108 |
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| Spatial Distribution of Water and Nitrogen under Different Strip-border Fertigation |
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GAO Jianmin, LYU Mouchao, DENG Zhong, LI Ying, HU Lan, ZHONG Zhibo
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1.Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences/Key Laboratory of Water-saving Agriculture of Ministry of Agriculture, Xinxiang 453002, China; 2.Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
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| Abstract: |
| 【Objective】The purpose of this paper is to estimate the optimal geometrical parameters of strip border fertigation of summer corn, as well as the associated spatial distribution of soil water and nitrogen. 【Method】Strip border with three widths - 1.5, 2.3 and 3.2 m - were studied. Fertilization ushered in when the surface water front reached 1/2, 1/3 and 100% of the border length respectively with the inflow of the fertigation cutting off when 85%, 90% and 95% of designed irrigation water was deemed to have flown into the border. The conventional border fertigation was used as the control. 【Result】 Spatial soil moisture distribution along the border length was significantly affected by the border width with a contribution rate of 94.36%. Along the same direction, the timing at which the inflow fertigation was cut off also had a significant effect on the uniformity of soil water and nitrogen distribution (DUWH and DUNH, DUNQ), particularly the nitrogen distribution, with a contribution rate of 23.9% and 91.74% respectively. Fertilization timing only significant affected DUWH and DUNQ , with a contribution rate of 56.09% and 27.41% respectively. 【Conclusion】 The spatial soil water and nitrogen distribution can be improved under strip-border fertigation by setting the border width at 1.5 m, and applying the fertilizer when the surface water front reached 1/2 of the border length, followed by cutting off the inflow when 95% of water was deemed to have flown into the border. The results presented in this paper provide a guidance for water and nitrogen management to improve their use efficiency under strip border irrigation/fertigation. |
| Key words: border irrigation; fertigation; fertilization timing; inflow cutoff; spatial distribution of water and |
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