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| Preliminary study on variation of dissolved oxygen concentration in drip irrigation system at different oxygation concentrations |
| RAO Xiaojuan1,2,3, WANG Zhiguo2, FU Yanbo2, MENG Ajing2,FENG Yaozu2, JIANG Ping′an1 |
| 1.College of Pratacultural and Environmental Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China; 2.Research Institute of Soil, Fertilizer and Agricultural Water Conservation, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China; 3.School of Biotechnology, Xinjiang Agricultural Vocational Technical College, Changji, Xinjiang 831100, China |
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Abstract To study decay rate of dissolved oxygen at different oxygen concentrations in an irrigation system and provide a guide for technology of oxygation in mulch drip irrigation, irrigation water was aerated by using micro-nano bubble generating device and then injected into the irrigation system at a higher pressure. There were four oxygation concentrations, 0% O2(CK, no aeration), 21% O2(air aeration), 30% O2(oxygen aeration)and O2 50%(oxygen aeration). The results show that the dissolved oxygen concentration in irrigation water rises significantly with increasing oxygation concentration, but decreases along the irrigation pipe, and the decay rate of dissolved oxygen increases with increasing oxygation concentration. The dissolved oxygen concentration in irrigation water at 1.38 L/h flow rate is lower than that at 3.20 L/h, the reduction in dissolved oxygen concentration gets large with increasing oxygation concentration and drip irrigation belt length. The lower the dripper flow rate, the more decrease the dissolved oxygen concentration in irrigation water. A different dripper flow rate can result in a different dissolved oxygen concentration. The dissolved oxygen concentration in irrigation water at 1.38 L/h flow rate is much lower than that at 3.20 L/h.
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Received: 31 October 2016
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