What adverse effects will the climate of drought first and then waterlogging have on apple trees? How to deal with it?

In the climate of drought before waterlogging, because of the low relative humidity of air and dry climate, the flowering period will inhibit the pollination of apple trees, resulting in the slow flowering of apple trees. If it is serious, it will also affect the growth of the fruit, leading to yellowing of the fruit and an increase in cracks. Because the high temperature in the climate of drought before waterlogging will increase the transpiration rate of plants and make the water in trees unbalanced, when the fruit trees are short of water, they will absorb water from the fruits to maintain their nutritional needs, leading to fruit wilting.

For the prevention and control measures of apple trees in dry climate before waterlogging, the first thing is to water the garden in time to keep the soil suitable for humidity and nutrients. Avoid improper root absorption of fruit trees due to water shortage, which will affect fruit growth. Straw can be used to cover the bottom of the apple tree, and some nitrogen fertilizer can be applied properly, which can not only reduce the water evaporation of the apple tree, but also help to lower the surface temperature, thus achieving the purpose of regulating the overall temperature of the orchard. Alginate fertilizer can be sprayed at night, which can replenish nutrients for apple trees and cool them down, which is beneficial to the root respiration of apple trees and make them better absorb nutrients for growth.

Applying lime solution to the trunk of apple tree can obviously reduce the surface temperature of apple tree and reduce the sunburn of apple tree. Some desiccant can be properly sprinkled on the roots of apple trees. Desiccant has strong water absorption and retention, and can form a barrier on the surface in a dry environment, so that when watering the apple tree, the apple tree can absorb water for a longer time to prevent water evaporation. For the climate of drought before waterlogging, it is necessary to strengthen the management of fruit forest, cut off redundant branches, burnt leaves and severely sunburned fruits, reduce the transpiration of apple trees and restore their vitality. If the density of apple trees in orchard is high, reasonable pruning amount should be increased to ensure the ventilation of apple tree crown and reduce the loss of water and nutrients of fruit trees.