Vegetable foliar fertilizer can timely supplement the nutrient demand lacking in the growth process of vegetables. Vegetable foliar fertilizer has the characteristics of small fertilizer, high utilization rate, quick effect and obvious effect, and can improve vegetable yield and quality. So, how to choose vegetable foliar fertilizer, how to use it? Let's take a look at it together. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Black Fungus Extract,Agaric Extract,Auricularia Auricula Extract,Auric Polysaccharide Shaanxi Zhongyi Kangjian Biotechnology Co.,Ltd , https://www.zhongyiherbs.com
First, how to choose vegetable foliar fertilizer
At present, there are many kinds of foliar fertilizers on the market, their chemical compositions are different, their properties are different, and the range of applicable vegetables is naturally different. Vegetables rich in edible stems and leaves, such as Chinese cabbage, cabbage, spinach, celery, bamboo shoots, leeks and other vegetables like nitrogen, foliar fertilizer is generally based on urea, ammonium sulfate and other water-soluble quick-acting fertilizers, urea concentration is controlled at 2% Within the range of 1.5%, the ammonium sulfate is controlled to be sprayed 2-3 times during the whole growth period, and 500 times of the edible vinegar is added during the spraying, and the effect is more remarkable.
Tomato, pepper, eggplant and various melon and fruit vegetables, foliar fertilizer should be based on NPK fertilizer or multi-component fertilizer, such as 0.3% potassium dihydrogen phosphate, 1% urea plus 2% superphosphate (leaching solution) adding 0.5% potassium sulfate solution and 0.08% rare earth micro-fertilizer solution, foliar treasure, photosynthetic micro-fertilizer, ammonium molybdate and other micro-fertilizers. It is usually sprayed once in the early and late stages of growth. According to the test, the effect of spraying multi-element fertilizer on melon and fruit vegetables is significant. For example, spraying sugar nitrogen liquid can not only increase the yield, but also significantly increase the disease resistance of plants and reduce the diseases such as vegetable downy mildew. .
Garlic, onion, radish, potato, taro and other root vegetables require more phosphorus and potassium. Foliar fertilizers are mainly phosphorus and potassium fertilizers, such as 0.3% potassium dihydrogen phosphate solution, superphosphate and grass ash immersion liquid, etc. Spray 3-4 times per season. According to the test, spraying 0.2% borax solution on root vegetables can effectively prevent the occurrence of physiological diseases; potato spraying 0.1% zinc sulphate plus 0.2% ammonium molybdate mixture has obvious improvement on tuber swelling and quality. Role.
Second, spraying vegetable leaf foliar four misunderstandings
1. Vegetable foliar fertilizer instead of fertilization
Because the foliar fertilizer is quick and effective, it is easy to use, and the winter temperature is low, and the root absorption capacity is reduced. Therefore, many vegetable farmers mention the fertilizer, and the first thing that comes to mind is foliar fertilizer. This approach is wrong. Although the effect of foliar fertilizer is much faster than that of the fertilizer, the amount of foliar fertilizer is small, which is insufficient to meet the nutrients required for a large number of vegetables. If the vegetable farmer relies too much on foliar fertilizer and the application of the fertilizer is insufficient, the roots of the crop will not be adequately nutrient, resulting in poor root development, affecting the further development of the plant, and even causing premature aging of the crop.
2. Vegetable foliar fertilizer and pesticides can be mixed admixture
It is very convenient to add foliar fertilizer when spraying drugs to prevent diseases, but foliar fertilizer is not mixed with any pesticide. For example, the inorganic nutrient foliar fertilizer should not be mixed with the copper preparation, because the copper preparation acts through the copper ion, and the various ions contained in the inorganic nutrient foliar fertilizer affect the release rate of the copper ion, thereby affecting the efficacy. . Foliar fertilizers such as amino acids and nucleotides are mostly weakly acidic and should not be mixed with alkaline pesticides. A small range of tests should be carried out before foliar fertilizers and pesticides are mixed.
3. Vegetable foliar fertilizer focus on the front of the leaf
Many vegetable farmers use the foliar fertilizer when they are applied to the front of the leaves. The cells on the front of the leaves are densely packed and covered with a cuticle, and the general fertilizer is difficult to absorb. Relatively speaking, the back of the blade is mostly sponge tissue, the cell gap is large, the water content is high, and the pores and water holes are mostly concentrated here. After using the foliar fertilizer, it can enter directly from the pores, water holes, etc., or directly penetrate into the It is very easy to be absorbed in cell tissue. Therefore, when spraying foliar fertilizer, it is necessary to spray the nozzle from the lower part of the vegetable to make it fully contact the back of the blade.
4. Vegetable foliar fertilizer is swept away with a sprayer
The longer the leaf is infiltrated by the foliar fertilizer, the higher the absorption rate. In order to meet this requirement, when applying foliar fertilizer, an appropriate additive for improving adhesion may be added, such as some special adhesives, or a neutral detergent such as washing powder, and the concentration is preferably 0.1%-0.2%.