| 低压滴灌施肥条件下温度对滴头堵塞的影响 |
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| 引用本文： | 王浩翔,张新燕,牛文全,刘敏,李斌.低压滴灌施肥条件下温度对滴头堵塞的影响[J].灌溉排水学报,2020(3):63-71. |
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| 作者姓名： | 王浩翔 张新燕 牛文全 刘敏 李斌 |
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| 作者单位： | 西北农林科技大学水利与建筑工程学院;西北农林科技大学水土保持研究所 |
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| 基金项目： | “十三五”国家重点研发计划项目(2016YFC0400202)。 |
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| 摘 要： | 【目的】探究低压滴灌施肥条件下温度对滴头堵塞的影响。【方法】采用短周期间歇灌水试验方法,考虑温度、运行压力、肥料质量浓度等因素,展开完全随机试验,研究滴头堵塞过程,寻求适宜的加肥质量浓度阈值。【结果】温度越高、运行压力越大、加肥质量浓度越低滴头堵塞风险越小;温度40℃时,运行压力50kPa、加肥质量浓度3g/L的处理具有最高的平均相对流量、均匀度系数以及最低的堵塞率;不同温度下加肥质量浓度阈值不同,温度10、20、30、40℃时加肥质量浓度阈值分别为4、5、7和8g/L。【结论】升高温度、提高运行压力、降低加肥质量浓度能有效降低滴头堵塞风险;升高温度还能提高加肥质量浓度阈值及水流携带固体颗粒的能力,但升高温度对滴头堵塞风险的降低程度随着压力的升高而减弱。
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| 关 键 词： | 低压滴灌 温度 施肥 堵塞 加肥阈值 |
The Effect of Temperature on Emitter Clogging in Low-pressure Drip Fertilization System |
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| WANG Haoxiang,ZHANG Xinyan,NIU Wenquan,LIU Min,LI Bin.The Effect of Temperature on Emitter Clogging in Low-pressure Drip Fertilization System[J].Journal of Irrigation and Drainage,2020(3):63-71. |
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| Authors: | WANG Haoxiang ZHANG Xinyan NIU Wenquan LIU Min LI Bin |
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| Institution: | (College of Water Conservancy and Architectural Engineering,Northwest A&F University,Yangling 712100,China;Institute of Soil and Water Conservancy,Northwest A&F University,Yangling 712100,China) |
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| Abstract: | 【Background】Drip fertigation is an effective way to concurrently replenish water and nutrients to meet the demand of crops,and precising fertigation can improve water and fertilizer use efficiency.As the key component in drip irrigation system,the emitter is to dissipate the pressurized water ensuring that water is supplied to the root zone uniformly and steadily.However,the emitter is also susceptible to clogging due to its narrow channel through which water flows.Emitter clogging is affected by many factors and what is less understood is the role of temperature.【Objective】The purpose of this paper is to experimentally investigate the effects of temperature on emitter clogging in low-pressure drip fertigation system.【Method】Using a short-cycle intermittent irrigation test method,a completely randomized experiment considering temperature,operating pressure and fertilizer concentration was conducted to study emitter clogging in attempts to find a threshold fertilizer concentration beyond which the emitter is susceptible to clogging.【Result】Rising temperature and operating pressure while lowing fertilizer concentration reduced the risk of emitter clogging.When the working pressure was 50 kPa and fertilizer concentration was 3 g/L, the dripping rate of the emitter peaked at temperature 40 ℃, the clogging rate was the leastand the irrigation uniformity was the highest. The threshold fertilizer concentration varied with temperature, being 4g/L, 5 g/L, 7 g/L and 8 g/L when the temperature was 10 ℃, 20 ℃, 30 ℃ and 40 ℃ respectively. 【Conclusion】Rising temperature and operating pressure, along with reducing fertilizer concentration, can effectively reduce therisk of emitter clogging. While rising temperature increased the threshold of fertilizer concentration and the ability ofthe water to carry solid particles, the efficacy of rising temperature in alleviating emitter clogging decreased as waterpressure increased. |
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| Keywords: | Low-pressure drip irrigation system temperature fertilization emitter clogging fertilizer concentration threshold |
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