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| DOI：10.13522/j.cnki.ggps.2017.0214 |
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| Effects of Different Irrigations and Nitrogen Applications on Distribution of Water, Nitrogen and Salt in Saline Soil as Well as the Yield of Oat |
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ZHANG Peng, JIANG Jing, MA Juanjuan, YANG Zhiping, WANG Yongliang
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College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;Institute of Agriculture Environment and Resources Research, Shanxi Academy of Agricultural Science, Taiyuan 030031, China; Key Laboratory of Soil Environment and Nutrient Resources of Shanxi Province, Taiyuan 030031, China
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| Abstract: |
| 【Objective】 Excessive application of nitrogen fertilizer and irrigation is an issue facing agricultural production in inland arid temperate regions in China, and the aim of this study is to experimentally investigate the optimal fertigation schedule to control the contents of water, nitrogen and salt in root zone to safeguard oat production in salt-affected soils in these regions. 【Method】 The work was based on pot experiment and considered combinations of two irrigation schedules (sufficient irrigation, W1, and insufficient irrigation, W2) and three nitrogen applications (high, N60, medium, N30, and low, N10). In each treatment, we measured the contents of water, nitrogen and salt in the pots. 【Result】 Increasing nitrogen application led to an increase in soil salinity, and insufficient irrigation could significantly reduce salt accumulation. Insufficient irrigation at mature and seedling stages with high nitrogen application could reduce salt content by 14.3%. When the amount of nitrate and ammonium application was the same and at the high level, insufficient irrigation in treatment W2N10 increased nitrate and ammonium contents in the pots by 13.8% and 34.2% respectively compared with sufficient irrigation in treatment W1N10. We did not find noticeable reduction in dry yield after reducing nitrogen application from 60 kg/hm2 to 10 kg/hm2, and found that a combination of 30 kg/hm2 nitrogen application with 100~140 mm irrigation sustained high yield. 【Conclusion】 Reducing fertilizer application along with insufficient irrigation can safeguard oat production in salt-affected soils without giving rise to soil salinity in temperate regions in China. The results of our pot experiments indicated that the rational fertigation is 10 kg/hm2 of nitrogen and 100~140 mm of irrigation. |
| Key words: oat; nitrate; ammonium; electrical conductivity; water and nitrogen coupling; yield |
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