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What are the control methods for nutrient deficiency diseases in citrus
Zinc deficiency causes mottled leaf disease. Citrus mottled leaf disease is a common disease, with the typical symptom being mottled small leaves. When new leaves begin to turn green, the main veins and lateral veins appear markedly green, while the remaining tissue is light green to yellowish white and glossy. In severe cases, only the area near the main vein or thick lateral veins is green, and the new leaves are narrow and mottled, mostly upright, with short internodes and clustered branches. Mottled disease is caused by zinc deficiency. Many soils are deficient in zinc, such as soils formed from granite, gneiss, and serpentinite, which contain little zinc; acidic sandy soils lose zinc easily; in alkaline soils zinc readily forms insoluble compounds, thus causing zinc deficiency. In addition, soil that is too dry or too wet, low humus content or excessive application of organic matter, which hinders contact between roots and soil, as well as heavy pruning, all make zinc deficiency likely to occur. Foliar fertilization can achieve fairly good results in controlling zinc deficiency. It is advisable to spray 0.2%-0.3% zinc sulfate solution (with an equal amount of lime) once during the tender shoot stage, and spray 2-3 times for severe zinc deficiency.</p><p></p><p>Copper deficiency or boron deficiency causes dieback disease. In the early stage of copper deficiency in citrus, new shoots are long, soft, and slightly curved, the leaves are large and dark, and fruiting is low, so it is easily mistaken for excessive vigor. In severe cases, the tips of the shoots turn tea-brown and die, short weak clustered branches appear, and they dry out and drop early and gum exudes; when the branches mature, the wounds are reddish brown, and parts of the leaves are reddish brown. Citrus has a very small copper requirement, and ordinary spraying of Bordeaux mixture is already sufficient. However, copper deficiency is likely to occur in peat soil, acidic sandy soil, soil with high organic matter content, as well as on abandoned grazing land and abandoned cemetery land; excessive application of barnyard manure and phosphate fertilizer also causes copper deficiency; newly reclaimed citrus orchards that have not been sprayed with Bordeaux mixture or other copper preparations for several years are prone to copper deficiency. Boron deficiency in citrus: the growing points of buds die continuously, forming clustered buds; leaf veins swell, become corky or split; the fruit is small and deformed, with thick hard peel, and brown resin deposits are present in the fruit center and spongy layer. Boron is easily lost from acidic soil, hence boron deficiency. In soil parent materials such as granite, gneiss, and schist, boron content is extremely low; in alkaline soil its solubility is poor, so boron is also deficient. Excessive application of phosphate fertilizer or lime, or soil drought, all affect the availability of boron and the absorption of boron by roots; sour orange has weak boron uptake, so citrus grafted onto sour orange rootstock is generally deficient in boron. For copper deficiency, Bordeaux mixture or other copper fertilizers can be sprayed. To supplement boron, soil application can be used, or 0.05%-0.1% boron fertilizer solution can be sprayed at the bud stage, flowering stage, and small fruit stage.</p>
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Detailed Explanation of Key Techniques for Fertilization and Nutrient-Water Management in Cauliflower
Cauliflower, also known as cauliflower, cauliflower, or cauliflower, is a cruciferous vegetable and a variety of cabbage. The head of cauliflower is a white inflorescence, similar to the head of broccoli. Cauliflower is more nutritious than ordinary vegetables. It contains protein, fat, carbohydrates
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What are the methods for growing green vegetables? A detailed explanation
Green vegetables contain multiple nutrients and are rich in vitamin C. Let's take a look at the cultivation techniques for green vegetables. 1. Choose the soil plot: Choose paddy fields and dry land with deep soil layers, good irrigation conditions, and no pollution of soil, water, or air. 2. Select good seeds: Make full use of the local
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What Nutrient Solution for Hydroponic Pothos? A Detailed Guide to Fertilizing Potted Plants
Pothos is one of the best air-purifying plants. It can be grown both hydroponically and in soil, but no matter which method you use, watering and fertilizing are very important if you want it to grow well. However, the fertilizing methods for hydroponics and soil culture are different, so how exactly do you fertilize potted pothos
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Where to Learn Soilless Cultivation Techniques? A Detailed Explanation of Nutrient Solution Formulas
Soilless cultivation is probably familiar to many people; in recent years it has become very common in our country and is a mature cultivation technique. One of the most important aspects of soilless cultivation is the work of mixing the nutrient solution, and there are some small tricks involved in this. Nowadays many people
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Why are grape berries small? Besides nutrient deficiency, there are also these factors
There are many reasons why grape berries are small, including variety issues, nutrient deficiency, too many berries, unreasonable fertilization and improper management. Solutions: Variety: learn more about varieties, and you will not buy a small-berry variety. Nutrient deficiency: spray promptly during the grape growing period
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New soilless cultivation techniques for cilantro: nutrient solution concentration control is key
For soilless cultivation of cilantro, the first choice is a good planting plot, with an adequate clean water source, sufficient electricity and good ventilation to build a greenhouse. Cilantro is suitable for sowing and raising seedlings in autumn and winter, because seed germination requires a certain temperature. After the seedlings are transplanted, different nutrient concentrations can be set according to different
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Sand Culture Vegetable Growing Techniques: Common Nutrient Film and Water-Vapor Sand Culture Methods
Abstract Nutrient film sand culture: grow in raised beds, dig a trench in the middle of the bed bottom, then install pipes for drainage and place a nutrient solution storage tank, irrigate with a micro pump. Water-vapor sand culture: use a trough-shaped structure, build the upper layer with a "two-four wall" (24 cm thick) and the lower layer with a "three-seven wall" (37 cm thick), stack with galvanized iron mesh
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Soilless cultivation formulas, including substrate formulas and nutrient solution formulas
Abstract Soilless cultivation substrate formula: sand, vermiculite, ceramsite, rock wool, perlite, sawdust, rice hulls, peat, etc. can be used. If cultivating tomato and cucumber vegetables, a mixed substrate of peat and vermiculite is better. Soilless cultivation nutrient solution formula: magnesium sulfate can be used
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How Do Coconuts Disperse Their Seeds? A Detailed Explanation of the Dispersal Method
Coconuts are deeply loved by people for their rich nutrition and delicious taste. They originated in southeastern Asia and are often planted in Hainan and Taiwan, China. So, how do coconuts disperse their seeds? 1. How do coconuts disperse their seeds? Coconuts disperse their seeds by water.
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