Abstract: 【Objective】China is the largest planting area and output in the world for kiwifruit which is vulnerable to extreme climate. It is considered one of the most serious natural disasters，which is characterized by the rapidly and suddenly onset, strong unpredictability, and significantly destructive power of hail. In recent years, frequently hail disasters have seriously threatened the safe production of kiwifruit. Anti-hail nets have become one of the effective measures for disaster prevention and reduction in production. Therefore, analyzing the effect of anti-hail nets in kiwifruit orchard is of great significance to prevent hail disasters, develop new materials and optimize structural design, guide the fine management and elevate the quality and efficiency of kiwifruit industry. 【Methods】 6-year-old Donghong kiwifruit trees were used as test materials at Shapo Village, Panlong Town, Shuicheng District, Liupanshui City in 2020 to 2021. On the same plot, white anti-hail nets were covered and open-air culture was used as the control. GSP-6 automatic temperature recorder was used to measure the orchard temperature, and so as AS823 illuminance meter to determine the orchard light intensity. The bud burst period, flowering period, maturity period, and leaf fall period of kiwifruit were analysised. Additionally,the bud spacing,bud germination rate on mother branches and the main flower number,single flower rate,orchard yield,fruit quality and leaf disease on bearing branches were measured on different length of bearing branches for 40-80cm, 80-120cm and above 120cm.The temperature, bud burst period, flowering period, maturity period,leaf fall period,bud spacing,bud germination rate,main flower number,single flower rate and leaf disease were compared inside and outside of anti-hail nets.【Results】Compared with the control, the temperature of kiwifruit orchard in the anti-hail nets was always higher than the control from February to April, up to 0.8 ℃, and was lower than the control from June to September, up to 2.1 ℃. The germination stage was delayed 3-5 days, the flowering stage was delayed 4-5 days, the maturity stage was delayed 7-8 days, and the defoliation stage was delayed 18-23 days. In 2020, the number of main flowers on bearing branches significantly decreased by 23.96%, 26.98% and 31.24%, and the single flower rate on bearing branches significantly increased by 95.39%, 103.31% and 105.76%. In 2021, the number of main flowers on bearing branches on different length of bearing branches significantly decreased by 24.52%, 22.43% and 28.37%, and the single flower rate on bearing branches significantly increased by 99.49%, 92.64% and 95.16%. Brown leaf spot disease rate, diseased leaf rate and disease index were 17.55%, 21.95%, 4.13% and 17.33%, 21.15%, 7.04% respectively lower than control for two years. The rate diseased plant, diseased leaf rate and disease index of gray spot were 6.73%, 20.73%, 6.02% and 9.04%, 25.66%, 8.63% respectively lower than the control. The rate of diseased plant, diseased leaf and disease index of black spot were 6.11%, 7.96% and 2.24% respectively lower than that of control. There were no significant effects on bud spacing and germination rate. 【Conclusion】Anti-hail nets can reduce the number of main flowers, promote the centralized opening of flowers and improve the single flower rate, reduce the incidence of leaf disease,but not affect the yield and quality of kiwifruit, and has a promoting effect on kiwifruit production. Anti-Hail nets is one of the effective measures to solve the contradiction between hailstorm disaster and airspace control, and it is expected to be popularized and applied in the production of high efficiency cash crops such as high-quality fruits and vegetables.
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