The effects of sunburn
Effects on leaves In June and July, under high temperature and low humidity conditions, the temperature reaches 35°C or more, and the outer leaves with thin leaf curtain layer are exposed to strong direct light, and the leaf edges will become chlorosis, followed by partial wilting and death, resulting in leaf burns.
Effects on the fruit Strong light and high temperature will continue, and the peel and pulp of the part where the strong light is directly exposed will cause burns and necrosis of the tissues, resulting in secondary fruit and easy fruit drop.
Prevention
Controlling the amount of fruit-hanging trees is overloaded with fruit-hanging, especially for varieties that are not vigorous or resistant. Controlling the amount of fruit-hanging is an effective measure to reduce or eliminate sunburn. When the swelling of the fruit is not large and the growth is obviously slow, the fruit should be thinned at any time to reduce the load.
Setting up a sunshade net to cover the sunshade net is also an important means. Moderate use of a sunshade net with a shading rate of 25%-50% can effectively alleviate the harm of high temperature and strong light in summer to the kiwifruit, but excessive shading has a negative impact.
When pruning in summer, leave 2 to 3 more leaves in the top fruit to block direct sunlight.
Grass or mulch in orchards can be used to cover the rows of kiwi fruit orchards with straw, straw or wheat straw to reduce soil moisture evaporation, or plant vetch and clover and other green manure crops in kiwi orchards, and use weeds and straws to cover. The root system of kiwi fruit is generally shallow. Avoid repeated rotation and weeding during the high temperature period to avoid damage to the root system of kiwi fruit.
Fruit bagging is prone to sunburn during the high temperature period. Fruit bagging or shading can be used to prevent sunburn, focusing on the southwest and upper fruits. Bagging should be carried out in the morning after the dew has dried up or the liquid medicine has dried. It is not advisable to bag up immediately after the rain. Bagging should be done after the fruit noodles are dried.
Irrigation should be done in time when it is dry to reduce the temperature of the whole orchard and reduce the occurrence of sunburn. If the orchard is dry, kiwifruit leaves will wilt from 12 noon to 4 pm on a sunny day. The main reason is that the temperature is too high and the leaf transpiration is too strong, and the root system cannot meet the needs of leaf transpiration. The stomata of the leaves are closed and the leaf wilt. Irrigation should be avoided at noon high temperature time. Irrigation can be divided into small borders. Drip irrigation and sprinkler irrigation can be used for orchards with conditions to avoid flood irrigation.
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