After the fruit trees are flooded, they are deprived of oxygen due to large moisture in the soil and poor air circulation, which can cause the roots of the fruit trees to become stagnant. In light cases, early defoliation, fine root rot, canopy dry top and bark darkening occurred, and the entire plant died. Therefore, effective measures must be taken for flooded fruit trees to promote the restoration of tree vigor as soon as possible.
First, the performance of fruit trees after flooding
All kinds of fruit trees have different degrees of tolerance. According to the survey, pears, jujubes, grapes, and apples are more tolerant; peaches, apricots, plums, and sweet cherries are the least resistant, and they die in water for 12-15 days. Different varieties of the same species of fruit have different responses to leeches. Taking pears as an example, Sour pears, pears, and Qiubai pears are more resistant to wolfberry; pears and crisp pears are secondary; Tire yellow pears are the most susceptible. In addition, the different types of rootstock have different responses to leeches, such as the most resistant cultivars of cypress rootstocks, followed by sea bream rootstocks. After the flooding of various fruit trees, roots suffocated due to lack of oxygen, resulting in fine roots and rot. After prolonged accumulation of water in the trunk, the cortex peels off and the wood changes color.
Second, management measures
1. Remove stagnant water. Between the rows of fruit trees, 1.5-2 meters away from the trunk, dig deep trenches 60-70 cm deep and 25-30 cm wide to allow water to infiltrate into the trenches. For the fruit trees that are overthrown, they must be upright, cultivated, reinforced and reinforced, and pillars can be set up when necessary.
2. Turn over the soil and dry it. Remove the sludge from the tree tray, and open the roots of the root and coarse root soil. You can also use the method of plowing and drying the air, that is, 1-1.5 meters away from the trunk, use iron shovels to turn the soil over to dry, in order to accelerate the dispersion of soil water, strengthen ventilation, conducive to soil microbial activity, restore root development, and promote root growth.
3. Increase fertilization. Combined application of phosphorus, potash and organic fertilizers. For fruit trees that have been suffering from a deficiency of nutrients, micro fertilizer should be sprayed in time. The use of Huimanfeng active liquid to dry it is also conducive to the restoration of tree vigor. The method is: for smooth skin of the epidermis, can directly apply 20 times Huimanfeng dilution; if the bark is too rough, it is necessary to scrape the old skin first. Apply it again. The general smear length is 80-100 cm.
4. Reasonably trim. For trees with long disasters and long flooding time, as some roots suffocate and the tree vigor is weakened, soil management should be strengthened to reduce the amount of results so that it can quickly restore tree vigor. During autumn harvest, it is only necessary to loosen or retract the dense branches. Upright branches. For trees with lighter locust plague, the long branches, upright branches, dense branches, diseased worm branches, and competing branches on the outside of the inner culprit can be cut off, and the tree branches can be retracted or thinned without cutting fruitless branches and auxiliary branches. Ventilate and transmit light to promote flower bud formation and improve fruit quality.
5. Control pests. After the fruit trees are flooded, the humidity of the soil and air is high, which creates favorable conditions for the occurrence of various diseases and insect pests. Therefore, we must pay close attention to the occurrence of pests and diseases and conduct timely and effective prevention and control. In addition, it is necessary to spray 2-3 times of tree-keeping agents and foliar chemicals to prevent the disease from spreading.
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