At present, due to the influence of strong convective weather, severe weather such as high temperature and rain frequently occurs, and this period is a crucial period for fruit tree management. Grasping the management during this period is critical to the growth of fruit trees and the improvement of the fruit-setting rate of fruit trees. In the past few days, the newspaper has received readers' questions about the management of fruit trees one after another. To this end, after an integrated review of the newspapers, the reporter interviewed the relevant management priorities of pear, apple, and peach trees and interviewed the Northwest A&F University. Several experts sought to answer readers' questions and dispel doubts. The key to pear yellow leaf disease is "supplementing iron" Li Xin said that pear yellow leaf disease is caused by iron deficiency, and the prevention and treatment methods should be based on iron supplementation. With the addition of organic fertilizers, organic manures can be used in addition to intercropping green manure crops, improving soils, increasing soil organic matter content, and promoting conversion of trivalent iron to divalent iron in soil. An orchard with severe yellow iron leaf disease can be combined with fertilization and divalent iron salts in autumn. Li Xin said that according to the age of the tree, the fruit grower generally applies 0.5 to 2 kg of ferrous sulfate or chelated iron to each plant. It is best to mix iron fertilizer and organic fertilizer in a ratio of 1:5 to bury the plant. Before spraying the iron-fermented pears, apply 0.3% to 0.5% of the ferrous sulfate solution to the branches, or mix the ferrous sulfate, copper sulfate, quicklime, and water in a ratio of 1:1:2.5:300. Liquid spraying has a significant effect on the control of disease occurrence, but its effective period is short. Apple early defoliation with "medicine attack" Some growers believe that Apple can do everything after bagging. It is not true that Apple should continue to prevent and control early-stage defoliation and other pests after bagging. Only by completely controlling the damage of various pests and diseases can Apple's yield and quality be guaranteed. The second year of flower bud formation. Han Mingyu said that after bagging, it should continue to do a good job of chemical control and protection. The recommended agents are: 200 times Bordeaux fluid, 1 to 2 times; 800 times, or 70 times. % Mancozeb WP800 times, or 12.5% ​​diniconazole WP800 times, etc.; in the early orchard where heavy berry disease occurs, use therapeutic bactericides such as: 50% puhai WP1500 times, or 70% imported methyl Topoxine WP1000 times. Every 12 to 15 days after spraying, pay attention to alternate medication and alternate medication. Zhang Zhicheng, a fruit specialist and senior engineer at the Northwest A&F University: Peach Fertilization Grips Key "Times" In the peach tree cycle, the absorption of nitrogen, phosphorus and potassium nutrients by peaches generally increases from the beginning of June, increasing with the fruit's growth and absorption, and the absorption of nutrients during fruit expansion increases sharply in early July. The absorption of potassium increased more significantly; by the middle of July, the absorption of the three elements peaked until a slight decrease before harvest. Therefore, topdressing at this time has an important effect on the growth and results of peach trees. Top dressing should be carried out from late June to early July when the fruits are inflated and fruits are harvested. The amount of top dressing is based on 250 g nitrogen absorption per 100 kg of fruit, and phosphorus, potassium fertilizer is applied in a ratio of nitrogen, phosphorus and potassium (2:1:3). Zhang Zhicheng reminded the fruit growers that topdressing should be applied 3 times, and the amount of topdressing fertilizers should account for 30% to 60%, 20% to 50%, and 20% of the total. Nuts are a group of cleistoses that have a hard skin and contain a single seed. It is the essence of plants, rich in nutrition, containing higher minerals, vitamins, oil and protein, eating more can promote growth and development, increase physical fitness. Common nuts include walnuts, peanuts, almonds, cashews, macadamia nuts, pistachio nuts and so on. Nuts, Almonds,Walnuts,Pistachio nuts,Macadamia nuts Xi'an Gawen Biotechnology Co., Ltd , https://www.seoagolyn.com
College of Plant Protection, Northwest Agriculture and Forestry University Professor Li Xin:
Li Xin pointed out that if yellow leaf disease is found during the growth period of pear trees, it can be treated with iron spray fertilizer in a timely manner, usually 7 to 10 days, until the leaves turn green. Applicable agents include 200-300 times of available iron, 500-600 times of Huangyeling, 200-300 times of ferrous sulfate, etc., and about 1% of urea can be properly added into the liquid during spraying.
Han Mingyu, Professor, College of Horticulture, Northwest A&F University: