| Influence of urea on emitter clogging with muddy water fertigation |
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| DOI：10.7606/j.issn.1000-7601.2018.02.14 |
| Key Words: urea muddy water clogging of dripper fertigation dripper flow |
| Author Name | Affiliation | | GUAN Ya-hui | Institute of Soil and Water Conservation, Chinese Academy of Science & Ministry of Water Resources of the People's Republic of China, Yangling, Shaanxi 712100, China
University of Chinese Academy of Sciences, Beijing 100049, China
Instiute of Water-saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China | | NIU Wen-quan | Institute of Soil and Water Conservation, Chinese Academy of Science & Ministry of Water Resources of the People's Republic of China, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China | | LIU Lu | Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
Instiute of Water-saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China | | WANG Ya-qiong | Institute of Soil and Water Conservation, Chinese Academy of Science & Ministry of Water Resources of the People's Republic of China, Yangling, Shaanxi 712100, China
University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: |
| Three kinds of sediment concentrations (1.0, 1.5 g·L-1 and 2.0 g·L-1) and three concentrations of the fertilizers (1% , 2% and 3%) were set up to determine the effect of urea on the clogging of the drip in the process of fertigation, and intermittent irrigation clogging test was conducted. The amount of discharge sediment and deposits sediment in the capillary was analyzed. The results showed that the application of urea to muddy water drip irrigation had the effect of relieving drip clogging. The effect of fertilization on the clogging of the emitter and the location of the main clogging was small. After apply urea to muddy water, the number of completely clogged emitters had declined, while the number of partially clogged drippers had increased. The sediment content in the drip flow increased with the increase of irrigation times, then gradually slows down and tends to decrease. Application of urea to muddy water improved the drip sediment transport capacity, the greater the concentration of fertilization, the greater the capacity of the drip sediment transport, the greater the discharge sediment rate. The application of urea in the water had the effect of slowing the clogging of the drip and prolonging the effective irrigation times of the dripper. When the sediment concentration was 2.0 g·L-1, the number of effective irrigation with the urea concentration of 1%, 2%, and 3% was 11%, 89% and 100% higher than that of urea without adding urea. After application of urea to muddy water, changing the nature of the electrochemical properties and sediment particle surface of muddy water, muddy water stable aggregates sediment flocculation difficult to form, the ability to carry muddy sediment particles applied urea increased, thus play a role in slowing the emitter clogging. The current study can provide a way to alleviate the risk of drip clogging which using the Yellow River water and improve drip irrigation system efficiency. |
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