Function: In agriculture, it promotes nutrient absorption and photosynthesis and also improves stress resistance. It has the effect of promoting plant growth, fruit growth and certain fruit strengthening effects.
Instructions for use: Generally, the flushing irrigation rate can be 1,000 times or 2-3 kilograms per acre (depending on the base fertilizer).
Notes: The effective period of spraying should be chosen during the peak period for the crops to absorb potassium and phosphorus nutrients. When spraying, the front and back sides of the leaves should be able to get the fertilizer and water.
1. The role of potassium dihydrogen phosphate
1. The main role of potassium dihydrogen phosphate is in agriculture, medicine, food and chemistry. In agriculture, it is mainly used to promote nutrients. Absorption and photosynthesis also improve stress resistance, which can promote fruit strengthening and plant growth.
2. It is used in medicine as a culture agent for penicillin or streptomycin.
3. It can be used in the chemical industry as a microorganism, treatment agent, fungus culture agent for water quality, and can also be used as a deiron agent for talc powder.
2. How to use potassium dihydrogen phosphate
1. The irrigation ratio of potassium dihydrogen phosphate can be 1000 times or 2-2 times per mu of land. 3 kg (depending on the base fertilizer). Some researchers from Southwest University have conducted root irrigation tests on tomato seedlings using potassium dihydrogen phosphate. When the concentration is 25-20 times, root irrigation has an inhibitory effect on tomato seedlings. When the concentration is lower than 20 times, seedlings will burn. situation, that is to say, if the concentration of potassium dihydrogen phosphate is too high, it will cause fertilizer damage.
2. Recommended concentrations for foliar spraying of various crops: 100 grams of foliar spray mixed with 50 kilograms of water; cash crops such as vegetables and cotton, leguminous crops such as peanuts, wheat, rice, corn, etc. For grass crops, flowers, tea leaves, and tobacco leaves, 100 grams should be mixed with 30 kilograms of water; when flushing, the dosage per mu should be 1-3 kilograms; when root irrigation, 50-150 grams should be mixed with 50 kilograms of water, and evenly irrigated at the roots of the crops; when soaking, soak the seeds. After 12 hours, take it out and dry it before sowing. The solution can be applied; when dressing the seeds, sprinkle it on the seeds and mix well, and then use it after drying. The specific concentration used depends on the specific local conditions. The above concentration is for high-purity potassium dihydrogen phosphate, and the chlorine content does not exceed the standard concentration.
3. Precautions when using potassium dihydrogen phosphate
1. Spraying should be done at the right time. Do not apply when there is morning dew or do not apply on rainy days. , do not apply at noon on sunny days, but can be sprayed all day on cloudy days. The time should be chosen before 10 a.m. and after 4 p.m.
2. The effective period of spraying should be selected during the peak period when crops absorb potassium and phosphorus nutrients, such as the heading and flowering and booting periods of cereal crops such as rice and wheat; the tuber expansion period of potato crops; and the growth period of rapeseed. Moss stage to flowering stage, etc.
3. It is recommended to mix potassium dihydrogen phosphate with some micro-fertilizers, nitrogen fertilizers and pesticides in a reasonable manner, which can increase fertilizer and drug effects and save labor. Potassium dihydrogen phosphate can also be sprayed mixed with non-alkaline pesticides or regulators. In crops that are deficient in boron and are effective in boron fertilizers, such as rape, cotton, wheat and other crops, using potassium dihydrogen phosphate mixed with boron fertilizer has a significant effect on increasing yield. The concentration of boron fertilizer is 0.1-0.2; in crops with poor growth, phosphorus deficiency, etc. Nitrogen and potassium fields are mixed, and the appropriate concentration of urea solution is generally required to be 1-2.
4. When spraying, the fertilizer and water should be accessible to both the front and back sides of the leaves. The walking should not be too fast and should be even.
5. Potassium dihydrogen phosphate should not be applied during the vegetative stage of plants. It can only promote the reproductive growth of plants to avoid phytotoxicity and waste.
6. Since potassium dihydrogen phosphate is relatively expensive in the market, you need to identify the authenticity when purchasing. Generally, good quality potassium dihydrogen phosphate is white crystal. After adding lime water (or plant gray water), There is no smell of ammonia, and the appearance and feel should be colorless or white glossy orthorhombic crystals or crystalline powder. The aqueous solution of potassium dihydrogen phosphate should be slightly acidic. The pH of a 1% aqueous solution is about 4.5. By pH You can also get a rough idea with test strips.
7. Since the two elements phosphorus and potassium are highly mobile in the body, deficiencies often appear on old leaves and flower stems. It is necessary to correctly judge whether plants are deficient in phosphorus or potassium. When phosphorus deficiency is severe , the plant is dark in color, long red or purple, the stem is short and thin, the leaves at the base are yellow, and the veins of the young leaves are chlorotic; when the plant is deficient in potassium, the leaf edges are cupped or wrinkled, and the leaves on the base stem are variegated or variegated. Chlorosis, the plant's stems are thin and weak, and there are necrotic spots between the leaf veins or at the leaf tips and leaf edges.
8. Spraying foliar fertilizer with potassium dihydrogen phosphate is only a supplement to plant fertilization. It cannot replace base fertilizer and root top dressing. The roots of plants have a larger absorption system and absorption capacity. Therefore, foliar fertilizer and root fertilization are cleverly combined to achieve higher efficiency.