hekun,weizhengying,chenxueli,et al.温度与压力对水肥一体化滴灌灌水器堵塞影响研究[J].灌溉排水学报,0,():-.
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西安交通大学 机械学院
关键词:  温度;施肥;灌溉;灌水器;堵塞
Investigation on the Effect of Eemperature and Pressure on the Clogging of Emitters with Integrated Water and Fertilizer Drip Irrigation
hekun1,2,3, weizhengying1,2,3, chenxueli1,2,3, weicaixiang1,2,3
1.Xi'2.'3.an Jiaotong University
【Background】Compared with the traditional irrigation and fertilization mode, water-fertilizer integrated drip irrigation has the advantages of even fertilization, water saving and fertilizer saving, and precise control. As the key equipment of drip irrigation system, the clogging problem of emitter has been restricting the promotion of the integration of water and fertilizer. There are many factors affecting the clogging of the emitter, but there is little research on the irrigation water temperature.【Objective】To investigate the influence of temperature on the blockage of emitter in the process of water-fertilizer integrated irrigation. Inquire the effects of different irrigation water temperature under low -pressure and normal pressure conditions on the integrated water and fertilizer of water and fertilizer on the emitters, and provide a certain basis for irrigation fertilization mode in different regions and seasons.【Method】To market the commonly used a plain channel emitteris as the research object,short-cycle intermittent irrigation clogging test was carried out with four temperature gradients (15℃, 20℃, 25℃, 30℃) and two working pressures (low pressure 50 kPa, normal pressure 100 kPa). The type of experimental fertilizer uses common ammonium phosphates in large fields, and experimental water uses water quality residents with good water quality. After each experiment, the average relative relative flow of the emitters is recorded. After the experiment, the structure and composition of the clogging material were analyzed by sem. And, disassemble the drip irrigation band, observe and record the blocking position of the blocking substance in the emitters.【Results】The test results showed that diammonium-phosphate had a significant effect on accelerating clogging, and the average relative flow of the emittersirrigator decreased to 15.03%~34.02% after the irrigation. The increase in temperature can increase the average relative flow, and the degree of increased at low pressure conditions is larger than under normal pressure conditions. When the temperature rises from 15℃ to 30℃, the decline rate of the average relative flow decreases. After the irrigation, the average relative flow increases by 18.55% under low pressure and 14.88% under normal pressure. Temperature does not affect the main components of the clogging material, which is mainly phosphate precipitation. Its blockage mechanism is the physical blockage of flocculation and the replacement of ions for the formation of flocculation and the replacement. However, with the increase of temperature, the flocculation phenomenon weakens and the complexity of the plugging material surface decreases. In the emitter, the blockage location is mainly concentrated in the transition zone, the channel head and the tail of the channel, accounting for 29.75%, 22.31% and 22.31%, respectively. Changing the temperature does not affect the distribution of the blockage location. Therefore, it is recommended to optimize the structure of the transition zone, the Channel head, and the tail of channel to alleviate the blockage of the irrigation device.【Conclusion】Under different pressure conditions, iIncreasing the temperature of fertilizer solution can relieve the blockage of irrigator emitters to a certain extent.
Key words:  Temperature; Fertilization; Irrigation; Emitter; Blockage