The main goal of pear orchard after pear harvest is to preserve leaves. Whether the leaves can be effectively retained is directly related to whether the stored nutrients of the pear tree can meet the nutrient needs of the next year's flowering, fruiting and other life activities. How can we do a good job of leaf preservation? Moisturizing work is the key.
First, the moisturizing work of the pear orchard after fruit harvest is very important
Because the fruit is harvested to varying degrees, wounds on the tree body, such as the handle mouth, part of the leaf bump and other wounds, are very easy to volatilize water. As the pear needs a large amount of effective water supply during the ripening process, the physiological functions of the pear tree are concentrated and effective. Water is supplied to the fruit, and the fruit is picked artificially. Under the condition that the pear tree is unprepared, the tree still supplies water to the fruit. However, since the fruit leaves a wound after the fruit is picked, the water is lost from the wound and the water is consumed. We saw that the leaves of the fruit shrank after harvest, which was caused by physiological water loss. In addition, fruit harvesting brings about changes in physiological functions. If water is insufficient, growth hormone will turn to abscisin, causing physiological deciduous pear trees. When the pear leaf shedding rate reaches about 80%, the flower buds and leaf buds will change from the latent state to Active state, the formation of autumn flowering and new shoots will consume the stored nutrients in the tree, thereby affecting the yield of pears in the following year.
The second is the things that should be paid attention to in the post-harvest moisturizing work
1. Do not apply high-concentration fertilizer within 15-20 days after harvest, which is what is usually called post-harvest fertilizer. According to the physiological functions of the tree, within 15 to 20 days after harvest is the recovery period of the tree's vitality. When the vitality of the tree is not restored, the application of high-concentration fertilizer is not only harmful to the recovery of the vitality of the tree, but it is counterproductive, causing the normal life activities of the tree to be destroyed, and it is easy to produce physiological leaf fall.
2. Do not use chemical weeding in the orchard within 15-20 days after harvesting before the tree's vitality is restored, especially not spraying weeds with glyphosate, because glyphosate weeding mainly destroys the green parts of weeds and causes weeds to die. After the weeds are sprayed with glyphosate, the stomata on the surface of the leaves are enlarged, and the amount of water evaporation is large. In order for the weeds to survive, they must desperately absorb a large amount of water from the soil to supplement, thus forming a situation where pear grass competes for water.
3. Avoid spraying high-concentration pesticides at noon high temperature within 15-20 days after harvest to avoid scalding the leaves.
4. Farmers with conditions after harvest can cover the pear trees with grass, green rice stalks and other straws to promote the moisturizing function of the pear orchard, keep the pear orchard soil moist, reduce water evaporation, and promote successful leaf preservation.
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