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| DOI： |
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| Correlation Between Indexes of Uniformity in Low Pressure Drip Irrigation |
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LI Wen， HUANG Xiuqiao ， HAN Qibiao， LI hao ， LI Hongyan， SUN Xiulu， NAN Xi
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Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences/Key Laboratory of Water Saving Agriculture of Henan Province, Xinxiang 453002, China; Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
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| Abstract: |
| Four drip-irrigation tapes under low pressure were tested under four laying lengths: 30 m, 60 m, 90 m and 120 m. The factors that affected and the variations of the uniformity indexes were analyzed and correlationsbetween the indexes were calculated. The results showed that the uniformity coefficient varied with the pressure as well as the length of the laying, but the impact of the pressure was insignificant. Both Christiansen uniform coefficient and distribution-uniform coefficient depended negatively on the laying length, while the variation coefficient was positively related to the laying length. There was a close linear relationship between the three indexes with the coefficient of determination higher than 0.96, remaining almost unchanged under both low pressure and normal pressure. |
| Key words: drip irrigation; uniformity; laying length; low pressure; relevantrelations |
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