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Key Technical Points for Flower and Fruit Retention in Citrus Cultivation
The 2-3 months from bud emergence to fruit set stabilization is the most important period of the year for citrus trees. For a good harvest, comprehensive flower and fruit retention measures must be taken according to the growth conditions of the citrus trees and changes in weather. 1. Reasonable fertilization: For citrus orchards that were not fertilized last winter, organic fertilizer should be supplemented as soon as possible. For adult trees, apply 5-10 kg of chicken manure or 1-2 loads of farmyard manure per tree, plus an appropriate amount of urea, and bury it around the root zone. The fertilization principle during the flower and fruit retention period is: nitrogen-based in the early stage, emphasis on potassium with phosphorus supplementation in the later stage; combining soil fertilization with foliar feeding. For the post-bloom fertilizer, apply compound fertilizer plus an appropriate amount of urea during the flower-falling period to promptly replenish nutrients consumed during flowering; for the fruit-setting fertilizer, apply potassium fertilizer plus an appropriate amount of phosphorus fertilizer; for the fruit-swelling fertilizer, apply compound fertilizer plus potassium fertilizer. For foliar feeding, spray 0.2% monopotassium phosphate twice from spring bud break to before flowering, spray nucleotides during rainy days, and add 0.1% borax to one of the applications; during the young fruit stage, spray foliar fertilizer 2-3 times in combination with pest and disease control or fruit retention, with the first foliar spray including 0.1% magnesium sulfate and 0.1% zinc sulfate.</p><p>2. Soil management: Repair drainage ditches inside and outside the orchard to remove standing water, so that waterlogging on rainy days does not affect root growth or even cause root rot leading to flower and fruit drop. During continuous dry and hot weather lasting more than 10 days, irrigate promptly to keep the soil moist and loose, which helps the root system absorb water and nutrients.</p><p>3. Scientific use of growth regulators: Plant growth regulators commonly used for citrus fruit retention include 2,4-D, fruit-retention hormone, triacontanol, 920, and fruit-retention agents. Use them 2-3 times after flower drop, spraying once every about 15 days. Alternating different growth regulators gives better results. For seedless and few-seeded citrus varieties, using 920 or triacontanol for fruit retention gives better results.</p><p>4. Pest and disease control: During the flowering and fruiting period, the main pests and diseases include red spider mites, rust mites, aphids, citrus blossom midges, tortrix moths, anthracnose, and scab. For aphid control during the spring shoot stage, use omethoate or monocrotophos; in early to mid-April (or early March if drought occurs), control red spider mites, and in mid-to-late April control rust mites, using acaricides or biological pesticides for spraying; spray organophosphorus pesticides at the early bud stage to kill citrus blossom midges and tortrix moths; for diseases, focus on prevention, using fungicides such as copper oxychloride or thiophanate-methyl.</p><p>5. Control early summer shoots: From May to mid-June, promptly remove early summer shoots to avoid competition between shoots and fruit for nutrients, which benefits young fruit development and reduces fruit drop. For vigorous trees with few flowers and few fruits, girdle the trunk 25 days after flower drop to retain fruit, which can also control summer shoots.</p>
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Detailed Explanation of the Key Points of Artificial Cultivation Techniques for Cordyceps sinensis
Is there artificial cultivation of Cordyceps sinensis now? Is artificial cultivation of Cordyceps sinensis very difficult? Wild Cordyceps sinensis is truly very rare, and people are now researching how to carry out artificial cultivation of Cordyceps sinensis. In recent years, research on artificial cultivation of Cordyceps sinensis at home and abroad
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Detailed Explanation of Flowering Period Regulation Techniques for Mango Cultivation
Mangoes in Guangdong generally bloom around February each year. At this time, they often encounter the influence of cold air from the north moving south, with low temperatures, continuous rain, and high air humidity, causing anthers not to split open, stigma damage, and even flower panicle mildew and death, affecting that year's fruiting. According to expert
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Detailed Explanation of Fertilization Techniques for Fruiting Mango Trees
Fertilization of fruiting mango trees should follow the principle of reasonably adjusting the contradiction between vegetative growth and reproductive growth. It is necessary both to promote flowering and fruiting in the current year and to control excessive summer shoot growth, and also to promote the sprouting and robust growth of autumn shoots, so as to lay a good foundation for continued bumper harvests in the following year. Fertilization
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6 Key Techniques for Apple Seedlings to Survive After Planting
1. Scientific storage, planting at the right time. For seedlings, winter storage (heeled-in) and planting in spring when local apple buds begin to swell are best. For heeling in, choose a shaded spot that does not collect water and dig a trench, maintaining stable and suitable moisture and temperature; when heeling in, make sure the roots are in close contact with moist sand (soil). 2. Do
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Detailed Explanation of Key Technical Points for Soil Management in Apple Orchards
I. Ridge raising and mulching. 1. Dig fertilization pits (this can be done together with the application of base fertilizer). On the inner side, 30-40 cm vertically below the extended branches on the outer periphery of the tree canopy, dig 2-4 fertilization pits each 40 cm long and 40 cm wide and 50 cm deep (the depth for topdressing is 20 cm). 2. Dig trenches and raise ridges. Outside the fertilization holes, along the row direction
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Technical Key Points for Applying Biogas Fertilizer to Apple Trees
In addition to being rich in the major elements nitrogen, phosphorus and potassium, biogas fertilizer also contains trace elements such as boron, copper, iron, manganese, calcium and zinc that play an important role in fruit tree growth, as well as large amounts of organic matter, various amino acids and vitamins. In addition, applying biogas fertilizer can significantly
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Key Technical Points for Planting and Management of Winter Jujube Trees During the Dormant Period
In November, winter jujube trees enter the dormant period, which is a favorable time for planting winter jujube. The main work this month includes applying base fertilizer, protecting the tree body, and building new orchards. 1. Applying base fertilizer: Applying base fertilizer at this time, when ground temperature is high and soil moisture is abundant, allows fertilizer to decompose quickly and facilitates root absorption.
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How to Graft a Jujube Tree? A Detailed Guide to Practical Grafting Techniques
Jujube tree grafting can still be carried out from July to September, and at this time, because the jujube branches grow vigorously and the graft buds develop plumply, the grafting survival rate is relatively high. I. Bark grafting method Collecting scions Select new-growing jujube shoots of excellent varieties suitable for local cultivation that are 1 to 2 years old
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Key Technical Points for Soil, Fertilizer and Water Management in Jujube Orchards
After jujube trees enter the full fruit-bearing stage, doing a good job of soil, fertilizer and water management and maintaining a good tree vigor are the prerequisites for high yield and quality. The soil, fertilizer and water management of jujube trees in the full fruit-bearing stage can be summarized as two tillages, four fertilizations and three waterings. The two tillages refer to deep plowing and intertillage. Deep plowing can loosen the soil in the jujube orchard,
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