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Control Methods and Technical Key Points for Apple Little Leaf Disease
Apple little leaf disease occurs mostly in orchards with poor soil and good permeability. Because of low zinc content, soluble zinc salts leach away and the disease becomes severe; frequent watering and rainfall cause large losses of soluble zinc; excessive nitrogen fertilizer use increases the tree's zinc requirement; in saline-alkali soil the pH
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What are the key points of apple autumn pruning techniques?
I. Autumn physiological characteristics: 1. In the late stage of new shoot nutrition (August to November), leaf photosynthates are transported downward in large quantities into buds, fruits, branches and trunks, and roots. 2. In the fruit ripening stage, including early, mid and late maturing varieties. 3. In the late stage of flower bud differentiation,
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Detailed Explanation of Key Technical Points for Soil, Fertilizer and Water Management in Apple Orchards
1. Soil management For the soil management of mature fruit tree orchards, the clear-root method or tree-disk mulching method should be adopted. From spring to before the rainy season each year, after combining fertilization and irrigation, carry out intertillage and loosening of the soil. Weed 1-2 times to keep the soil loose and free of weed growth. In the rainy season, cut grass and cover the tree disk 1-2 times. In autumn, after the fruit trees shed their leaves, carry out autumn plowing. Use an iron shovel to deep-turn the tree disk to 15-20 cm, then apply additional organic fertilizer. Apply topdressing three times, respectively before and after sprouting, after flower drop, and during the fruit enlargement stage, using nitrogen, phosphorus and potassium elements in combination. The ratio is 1:0.6:1.5.
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Detailed Explanation of Key Techniques for Autumn Management of Apple Trees
The peak period of flower bud differentiation in apple trees occurs in autumn. Doing a good job of autumn management of apple trees can lay a solid foundation for high, stable and high-quality yields in the following year. Fertilizer and water management For non-bearing trees, 0.15-0.25 kg of diammonium phosphate can be applied per tree; for large bearing trees, according to the planned yield for the following year, 0.7 kg of pure nitrogen and 0.7 kg of available phosphorus can be applied per 100 kg of fruit. Topdressing for young trees can significantly increase the sprouting rate in the following year. For large trees in full bearing period, applying fertilizer in autumn year after year, under the same amount and types of fertilizer, compared with topdressing in early summer, can increase the yield by about 50 kg per tree.
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Detailed Explanation of Key Points of Autumn Fertilization Techniques in Apple Orchards
1. Fertilization principles: On the premise of increasing the application of organic fertilizer and building up soil fertility, emphasize potassium, increase nitrogen, stabilize phosphorus, and supplement micronutrients, and vigorously promote soil-testing-based formula fertilization. 2. Fertilization types: (1) Organic fertilizers mainly include: manure and urine, barnyard manure, compost, cake fertilizer, straw,
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What are the control methods for apple fruit cracking disease?
In the late stage of apple growth, fruit cracking disease is common and causes relatively serious damage, severely affecting the commercial value of apples and deserving sufficient attention. Apple fruit cracking disease is caused by slow expansion of fruit flesh cells during the early drought period of apple growth, and rapid cell expansion when rain occurs in the middle and late stages of apple growth
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What should be noted before and after bagging apples?
Bagging fruit can make the fruit surface fine and smooth, with bright and beautiful color, prevent pests and diseases, reduce pollution from pesticides and dust, produce pollution-free high-quality premium fruit, and effectively enhance the commercial value of the fruit. However, some fruit growers' bagging techniques are not standardized, and measures are not fully implemented,
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What are the control methods for calcium deficiency in apple trees?
Symptoms of calcium deficiency in apple trees: bitter pit formed in the early stage, with a spongy texture under the skin but without rotting. The red spots and black spots formed before harvest should be distinguished as to whether they are an infectious disease or a physiological disorder. The red spots and black spots formed by infectious diseases rapidly expand and penetrate deep into the flesh and
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How to do winter pruning of apple trees? Detailed explanation of key pruning measures
In the training and pruning of apple trees, the choice of tree shape model must be targeted. For newly built orchards, the high spindle modern cultivation training method should be adopted. For old overcrowded orchards, a decision must also be made to carry out renovation. The renovation of overcrowded apple orchards mainly adopts the principles of thinning out, raising the trunk,
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What to do when bagged apples develop shriveling and cracking
Bagged apples tend to develop micro-cracks and shriveled skin after the bags are removed. This phenomenon falls into two cases: first, the fruit has already developed shriveling and cracking inside the bag, and once the bag is torn off it becomes even more severe; second, there is no abnormality when the bag is torn off, but soon after coloring, micro-cracks, shriveled skin, softening and other undesirable phenomena occur.
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