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| DOI： |
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| Comprehensive Benefit Evaluation of Walnut Trees with Different Irrigation Quota under Drip Irrigation |
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LI Dan， ZHAO Jinghua, FU Qiuping, HONG Ming, MA Yingjie
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College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China
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| Abstract: |
| In order to evaluate the comprehensive benefit of walnut trees, the field test was carried out with 8-year-old walnut trees as the research object. Through the comparison of canopy parameters under 3 levels of irrigation quota, such as 150 m3/hm2 (C1 treatment), 300 m3/hm2 (C2 treatment) and 450 m3/hm2 (C3 treatment) respectively, the best irrigation quota treatment was selected depending on the mathematics analysis method. The results indicated that during the fruit expanding process of walnut trees, C2 had a significant effect on leaf area index. However, the values of light transmittance, DSF and ISF under C1 and C3 treatments were much bigger than C2 treatment. At the middle growth stage and late growth stage, C2 and C3 treatments had obvious effects on radiant energy interception, while C1 treatment had a weak interaction. With the growing of fruits, there was an increase among leaf area index and radiant energy interception, till they were stable. The parameters of light transmittance, direct site factor and indirect site factor decreased continuously. Leaf area index and irrigation quota could significantly influence the production of walnuts. The experiment proved that the irrigation quota of 300 m3/hm2 under drip irrigation could make a strong guarantee for the optimal production and optimum economic benefit. |
| Key words: canopy parameters；principal component analysis；irrigation quota；drip irrigation；walnut |
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