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| Effects of mist spray on photosynthetic characteristics, yield and quality of grape |
| ZHENG Ming, ZHANG Jianghui, BAI Yungang*, LIU Hongbo, DING Ping |
| Xinjiang Institute of Water Resources and Hydropower Research, Urumqi, Xingjiang 830049, China |
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Abstract In order to study the effects of drip irrigation(irrigation method)+ mist spray(cooling and humidifying measures)on the photosynthetic characteristics, physiological indexes, yield and quality of grape, three treatments(WP1, WP2 and WP3)and a control(CK)were set up in experiments. The photosynthetic characteristics, grain volume, yield and quality of grape in these treatments were measured during fruit swelling period. The results showed that the daily variation of intercellular CO2 concentration in the mist spray treatments was lower than in the control, and the lowest concentration of intercellular CO2 occurred in WP1 treatment. The net photosynthetic rate of all the treatments showed an M-shaped profile, i.e. the phenomenon called ″midday depression″ appeared at 14:00. In the mist spray treatments, however, the time for ″midday depression″ was shorter than in the control, further, the net photosynthetic rate in WP1 treatment decreased slightly at 14:00. The growth rate and fruit grain volume were in a rank of WP1, WP2, WP3 and CK from the largest to smallest, and the growth rate of fruit grain volume in each treatment reached the maximum on July 15. The yield and quality of each treatment were evaluated by using entropy method, and the corresponding scores were in a rank like WP1, WP2, CK and WP3 from the highest to the lowest. It was suggested that an appropriate mist spray could significantly improve net photosynthetic rate, growth rate of fruit grain volume and fruit grain vo-lume, yield and quality of grape. However, a longer mist spray could also reduce grape yield and qua-lity, so a mist spray for 1 hour per day was the best.
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Received: 14 October 2019
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