Vegetable leaf fertilizer fertilizer technology question and answer

May 09, 2019

1. What are the benefits of using foliar dressing in vegetables? Foliar dressing is a common method of fertilizing vegetables and has many unique advantages:
(1) The foliar dressing can make the crop directly obtain effective nutrients through the leaves. When using the top dressing, some nutrients are often easily fixed by the soil to reduce the utilization rate of the plants.
(2) The rate of absorption and transformation of leaf nutrients is faster than that of the root; taking urea as an example, the topdressing of the root for 4 to 5 days can be effective, and the foliar spraying can be effective on the same day.
(3) The foliar dressing can promote the absorption of nutrients in the root and improve the effect of root fertilization.
(4) After foliar spraying of certain nutrient elements, it can regulate the activity of enzymes, promote the formation of chlorophyll, enhance photosynthesis, and improve the quality and yield. In short, foliar dressing is a fertilization method with low cost, quick effect, simple method and easy popularization. However, the crops absorb mineral nutrients mainly by the roots, and the foliar fertilizer can only be used as an auxiliary means. The production should still be based on root fertilization. When using foliar fertilizers, it must be done on the basis of adequate base fertilizer and timely fertilizer application. In this way, the desired effect can be achieved.
2. Which fertilizers are suitable for foliar dressing? Fertilizers suitable for foliar application are often called leaf fertilizers, foliar fertilizers or foliar nutrient solutions. According to the composition can be divided into nitrogen fertilizer, phosphate fertilizer, potash fertilizer, phosphorus and potassium compound fertilizer, NPK fertilizer, trace fertilizer, rare earth micro-fertilizer and foliar fertilizer added with plant growth regulator, etc.; common vegetable fertilizer on the surface of urea, Potassium sulphate, superphosphate, potassium dihydrogen phosphate, borax, ammonium molybdate, zinc sulphate, rice vinegar, sucrose, rare earth microelement fertilizer, and leaching of plant ash. These fertilizers have the characteristics of being stable and not damaging the blades.
3. How to reasonably select the appropriate foliar fertilizer according to the characteristics of different vegetables need fertilizer?
(1) Leafy vegetables (such as Chinese cabbage, Chinese cabbage, spinach, celery, etc.): The main foliar dressing is mainly urea, and the spray concentration is 0.3% to 0.5%, spraying 75 to 100 kg per 667 square meters, for a total growth period. Spray 2 to 3 times; can also spray 0.3% rice vinegar solution, spray about 50kg per 667 square meters.
(2) fruits and vegetables (such as cucumbers, tomatoes, eggplant, pepper, beans, beans, etc.): Top dressing with nitrogen, phosphorus, potassium or multiple compound fertilizer, such as 0.2% ~ 0.3% of dihydrogen phosphate Potassium solution, 0.5% urea+2% superphosphate+0.3% potassium sulfate solution, 0.05% rare earth micro-fertilizer solution, etc., usually sprayed 2~3 times during the growth period; sprayed Shibao, Yemianbao, photosynthetic fertilizer, etc. The application of fruits and vegetables also has a good effect. In addition, when cucumbers are sprayed with 1% glucose or sucrose solution, the sugar content of cucumbers can be significantly increased. The “sugar nitrogen solution” consisting of 0.2% urea+0.2% potassium dihydrogen phosphate+1% sucrose can not only increase Yield, but also enhance the plant's resistance to disease, reduce the incidence of downy mildew and other diseases.
(3) Garlic, root vegetables, yam vegetables (such as garlic, onion, radish, carrot, potato, etc.): The top dressing is mainly phosphorus and potassium fertilizers, such as 0.2% potassium dihydrogen phosphate solution, superphosphate And ash leaching liquid. At the same time, according to the lack of trace elements in the soil, spray trace element fertilizer. Such as radish, mustard sprayed 2 to 3 times 0.1% to 0.2% borax solution, can increase production, but also prevent heartache, improve quality; potato spray 0.1% zinc sulfate + 0.1% ammonium molybdate mixture, generally available Increase production by about 10%.
4. What problems should be paid attention to when dressing vegetable foliage?
(1) The spray concentration should be appropriate: The foliar dressing must control the spraying concentration. If the concentration is too high, it will be prone to damage and cause unnecessary losses. Especially for trace element fertilizers, the critical range between the deficiency and the excess of vegetables is very narrow, and stricter control is required. If the concentration is too low, it will not achieve the desired effect.
(2) The spraying time should be appropriate: One of the main factors affecting the effect of foliar dressing is the moistening time of the fertilizer solution on the leaf surface; the longer the moistening time, the more nutrients the leaf surface absorbs and the better the effect. Therefore, the foliar dressing must be based on the weather conditions, select the appropriate spraying time; generally sunny, early or late or cloudy for the best. Before the rain or the rain, the foliar dressing cannot be carried out; after 3 h, the rain is sprayed. After the sunny day, the spray should be sprayed once, but the spraying concentration should be reduced appropriately.
(3) Appropriate fertilizers should be mixed: When foliar fertilizers are used, a reasonable mix of two or more types of foliar fertilizers will be more effective, and the time for spraying and labor can be saved. However, after the fertilizers are mixed, they must have no adverse reactions or do not reduce the fertilizer efficiency, otherwise they cannot achieve the purpose of mixing. In addition, when the fertilizer is mixed, it is also necessary to pay attention to the concentration of the solution and pH; under normal circumstances, the pH value of the solution is favorable for leaf absorption when the pH is 6-7.
(4) The quality of spraying should be ensured: the foliar dressing requires fine droplets and uniform spraying, with special attention paid to the growth of the upper leaves and the back of the blades. Because the new leaves absorb the nutrients faster than the old leaves and the back of the leaves, the absorption capacity is strong.

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