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| DOI：10.13522/j.cnki.ggps.20190263 |
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| The Effects of Drip Irrigation with Reclaimed Wastewater on Chlorophyll, Photosynthesis, Yield and Quality of Cucumber |
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WANG Lulu, TIAN Juncang, XU Guihong, SHENG Hui, YAN Xinfang
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1. School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China; 2. Engineering Technology Research Center of Water-Saving and Water Resource Regulation in Ningxia, Yinchuan, China; 3. Engineering Research Center for Efficient Utilization of Modern Agricultural Water Resources in Arid Regions, Ministry of Education, Yinchuan 750021, China
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| Abstract: |
| 【Objective】Irrigating with treated domestic and urban wastewaters has been in increase over the past decade and the purpose of this paper is to investigate the effects of irrigation amount and scheduling on photosynthetic traits, yield and quality of cucumber.【Method】We compared three irrigation amounts: 1 890 m3/hm2, 2 835 m3/hm2 and 3 780 m3/hm2, with each having a control that was irrigation with the same amount of clean water. In each treatment, we measured photosynthetic traits, chlorophyll content and yield. 【Result】In all treatments and controls, the four photosynthetic traits - net photosynthetic rate, transpiration rate, stomatal conductance and intercellular carbon dioxide concentration - as well as the chlorophyll content and yield all increased with the irrigation amount, while the “grouped” water use efficiency decreased inversely with the irrigation amount. When the irrigation amount was the same, irrigating with reclaimed wastewater increased average of the four photosynthetic indexes and chlorophyll content by 7.32%, 2.99%, 4.19%, 3.07% and 5.54%, and the average of “grouped” yield and water use efficiency by 8.9%. 8.86% respectively, compared with the controls. As irrigation amount increased, the soluble sugar and solids content of the fruits decreased while the vitamin C and total acid mass fraction increased. When the irrigation amount was the same, irrigating with reclaimed wastewater increased the average vitamin C content, soluble sugar content and soluble solids content by 1.14%, 12.64% and 5.8% respectively, while reduced the average total acid content of the fruit by 8.72%, compared to the controls. 【Conclusion】In terms of photosynthetic indexes and yield, the optimal irrigation scheduling for the reclaimed wastewater was: Irrigating 3 780 m3/hm2 of water in 21 times with each irrigation being180 m3/hm2. |
| Key words: reclaimed wastewater; drip irrigation; cucumber; photosynthesis; fruit quality; water use efficiency |
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