The influence of high temperature on the leaves of apple trees can cause sagging, curling, withering, and even shedding. In response to this problem, the reporter interviewed Li Bingzhi, a professor at the College of Horticulture, Northwest Agriculture and Forestry University. He said that a scientific response should be made to this issue to avoid high temperature hazards.
Timely irrigation When drought occurs, it can be irrigated with a small amount of time to keep the soil moist. It is also possible to spray water on the crown several times before 9 o'clock in the morning or after 4 o'clock in the afternoon to reduce the fruit drop caused by high temperature and water shortage.
Covering gardens to conserve water to make full use of straw, weeds, etc., to cover the orchard with tree trays. If weeds grow in the garden during this period, do not perform weeding work. Weeds can be used to cover the water, and water retention can slow the evaporation of water. You can also use water-retaining agent, 150 grams of trees, 50 to 100 grams of trees. Li Bingzhi said that it would be better to cover the mulch at this time to have better water retention effect. After the water retaining agent expands, it can provide moisture to the fruit trees slowly.
Timely fattening Li Bingzhi said that prolonged high temperature and drought will cause the tree to be weak, and the fruit will have less water content. After the drought is relieved, a 0.2%~0.4% potassium dihydrogen phosphate should be sprayed in time to increase the potassium content of the tree. Li Bingzhi also suggested that in case of a small amount of rainfall, the fruit grower should immediately apply a nitrogenous fertilizer to restore the tree vigor and prevent heavy rains from happening once the drought hits, triggering a large number of crackers.
Prevention of pests and diseases After high temperature and drought, the tree vigor is generally weak, which can easily lead to the occurrence of diseases and insect pests. According to the disease occurrence rule of different fruit trees, a carbendazim, thiophanate-methyl, acetaminophen, broom, and a Pharmaceutical agents such as bacteriocin and triazotin are used to prevent the occurrence and harm of pests and diseases and to avoid causing early defoliation and restore the tree vigor as soon as possible.
The pruning of the fruit trees when the pruning of the high temperature and drought is reasonable can cause the new wounds of the branches to increase the transpiration of the tree body and thus aggravate the high temperature hazard. Li Bingzhi also reminded fruit growers, but they must trim some of the branches and branches of pests, weak branches, and legged branches. When pruning, they should be as short as possible and not recut to ease the tree vigor and reduce the amount of water consumed by vegetative growth. At the same time, in the growing period of fruit trees, excess sprouts can be wiped out in time to remove redundant shoots, in order to reduce the number of branches and leaves, reduce water transpiration, prevent excessive evaporation and burning of leaf surface water, and reduce the impact of drought on the fruit.
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