The main goal of the pear fruit orchard is to preserve the 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?
First, the moisturizing of the pear orchard after fruit harvest is very important. Because the wounds of the tree body are caused to varying degrees during the fruit harvest, such as the stalk, part of the leaf bump and other wounds, it is very easy to volatilize water. Because the pear needs a large amount of effective water supply during the ripening process, the physiological function of the pear tree is concentrated. Effective water supply to the fruit, and the fruit is picked artificially. Under the condition that the pear tree is unprepared, the tree body still supplies water to the fruit, and because the fruit leaves a wound after the fruit is picked, the water is lost from the wound and the water is consumed. We usually see that the leaves of the fruit shrunk after harvest, which is 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 defoliation of 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, which will affect the next year's pear output and economic loss.
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 function of the tree, within 15-20 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. Within 15-20 days after harvest, before the vitality of the tree body is not restored, do not use chemical weeding in the orchard, especially not spraying weeds with glyphosate, because glyphosate weeding mainly destroys the green part 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 of pear grass competing 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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