Potassium dihydrogen phosphate is a very commonly used foliar fertilizer. It is a high-quality, high-concentration chlorine-free phosphorus potassium fertilizer with extremely low salt value and high nutrient content. It is suitable for use on a variety of crops. It not only promotes fruit expansion, color change, and crop metabolism, but also improves crop rooting, frost resistance, and stress resistance. It is called a “universal fertilizer.”
Specific functions of potassium dihydrogen phosphate
1. Promote nitrogen and phosphorus absorption
Potassium dihydrogen phosphate can promote the absorption of nitrogen and phosphorus by crops, quickly replenish phosphorus and potassium, increase crop yield and thousand-grain weight, and can play a special role in the special physiological period of crops.
2. Promote photosynthesis
Potassium plays a role in byk adhesion promoter crop growth by enhancing crop photosynthesis and accelerating the production and transformation of nutrients.
3. Improve the stress resistance of crops
Potassium dihydrogen phosphate can improve the stress resistance of crops, such as drought resistance, dry and hot wind resistance, waterlogging resistance, frost resistance, damage resistance and promote healing. , Resist bacterial infection, etc.
4. Improve fruit quality
Spraying during the fruit expansion period can protect and strengthen the fruit, promote fruit expansion, improve fruit quality, increase coloring, and improve taste.
5. Regulate crop growth
Potassium dihydrogen phosphate has the function of a regulator, which can promote the differentiation of crop flower buds, increase the number of flowers, make the flower buds strong, strengthen the flowers and preserve the fruits, and improve the fruit setting. , and can effectively promote the growth and development of root systems.
However, some people may have been using potassium dihydrogen phosphate for more than ten years, and they may not necessarily know all the eight taboos about potassium dihydrogen phosphate!
First of all, in terms of chemical reactions, phosphate is insoluble in water when mixed with these metal ions.
In practical applications, it can also be mixed at low concentrations, but some need to be prepared and used immediately, and precipitation will occur if left for a long time. , and some will precipitate when mixed! Based on field tests from many aspects, you must pay attention to these eight taboos!
Eight taboos when using potassium dihydrogen phosphate
1. It is prohibited to mix it with alkaline products:
The pH of 1% potassium dihydrogen phosphate aqueous solution is around 4.6 , is slightly acidic, and chemical reactions will occur when mixed with alkaline fertilizers and pesticides. Abnormal chemical reactions such as flocculation, precipitation, discoloration, heat generation, and bubbles will occur. This will lead to the failure of the function of potassium dihydrogen phosphate.
Alkaline pesticides that cannot be mixed are Bordeaux mixture, lime sulfur mixture, copper hydroxide (which can be killed), and rosin mixture , sodium dipotassium tetrachloride, bensulfuron-methyl (weakly alkaline), sodium pentachlorophenate, alkaline fertilizers that cannot be mixed are: ammonia, lime, plant ash, calcium magnesium phosphate fertilizer, ammonium bicarbonate, etc.
2. It is prohibited to mix with products containing carbonate (CO3-).
Because carbonate and hydrogen ions of potassium dihydrogen phosphate react to produce carbon dioxide (CO2) gas. Such as potassium carbonate, ammonium bicarbonate, ammonium bicarbonate, sodium bicarbonate, etc.
3. It is forbidden to mix with products containing copper ions
Potassium dihydrogen phosphate cannot be mixed with copper hydroxide, basic copper sulfate, calcium copper sulfate, cuprous oxide, and copper hydroxide , quinoline copper and other copper preparations are mixed, these free copper ions will react with phosphate ions to form flocculation and precipitation.
Potassium dihydrogen phosphate + kasugamycin king copper precipitation
4. Medium and trace amounts in the free state are prohibited Elements (calcium, magnesium, zinc, iron) are mixed, and the sugar alcohol form is ready for use.
These free metal ions will react with phosphate ions to form flocculation and precipitation, such as calcium, magnesium, zinc, iron , manganese products.
Sugar alcohols are easily decomposed when exposed to light or high temperatures, and trace elements become free ionic states, which may also cause flocculent precipitation. It is recommended to prepare it now and not to keep it for a long time.
Inorganic salts are in free form, so they cannot be mixed with zinc sulfate, ferrous sulfate, manganese sulfate, copper sulfate, etc. Mix fertilizer products.
Pesticides such as mancozeb, mancozeb, vitriol, metalaxyl, mancozeb, etc. cannot be mixed! Mixing with mancozeb may cause precipitation and produce toxic gases.
The use of chelated EDTA will not react with potassium dihydrogen phosphate, because the chelated medium and trace elements It will complex these ions, making them more stable and will not produce free metal ions.
5. Excessive use in the early growth period is prohibited
Potassium will have an antagonistic effect with magnesium, calcium and other ions, affecting the absorption of these two types of ions, which is not conducive to the growth of plant cells and affects plant extraction. The longer the seedlings are, the greater the impact will be on later yields. Therefore, it is not recommended to use potassium dihydrogen phosphate during the seedling stage (1-3 leaves) and before the flowering stage of vegetables and beans to avoid damage to seedlings, flower and pod loss, and if used too early on soybeans, it will cause yield reduction.
6. It is forbidden to use potassium dihydrogen phosphate as a substitute for base fertilizer
Because potassium dihydrogen phosphate has very good water solubility and is easily dissolved when exposed to water. It will be washed away by rainwater and the effect will be short-lived, so it is not recommended to be used as a base fertilizer. It is better to use compound fertilizer as a base fertilizer, which is slow-release and long-lasting. Potassium dihydrogen phosphate has good water solubility and strong quick-acting effect. It can be used for leaf spraying and root flushing during critical periods such as flower bud differentiation.
7. It is prohibited to use it at high temperatures and at high concentrations
High temperature will cause potassium dihydrogen phosphate solution to As the concentration increases, it is easy to cause fertilizer damage. If the concentration is too high, it will also cause fertilizer damage, such as leaf burning and root burning.Potassium spraying time should avoid the high temperature period at noon, and it is best to use it before 10 a.m. or after 4 p.m. It is prohibited to use high-concentration foliar sprays during high-temperature seasons.
Grabine crops such as wheat and rice can be sprayed at a concentration of 300-500 times. For other crops, it is recommended to spray at a concentration of 500-800 times. The dilution ratio should not be less than 300 times, preferably 500 times. above.
8. It is forbidden to add EC first and then potassium dihydrogen phosphate
When mixed with EC pesticides, add EC last to avoid affecting the dissolution of potassium dihydrogen phosphate. Because the emulsifiable concentrate was put in first, and then the potassium dihydrogen phosphate was added without secondary dilution, the oil coated the potassium dihydrogen phosphate particles. Therefore, when dispensing, be sure to dissolve the powder and granules first, and finally add the emulsifiable concentrate.
Three recommendations for mixing potassium dihydrogen phosphate
One recommendation
Diphosphate Reasonable mixing of hydrogen potassium and some nitrogen fertilizers, micro-fertilizers and pesticides can save labor and increase fertilizer and drug effects.
In fields with poor crop growth and lack of nitrogen, phosphorus and potassium, mixed application is generally required. The appropriate concentration of urea solution is generally 1% to 2%.
Second recommendation
Mixed application of potassium dihydrogen phosphate and boron fertilizer. In crops that are deficient in boron and are sensitive to boron fertilizer, the mixed application of potassium dihydrogen phosphate and boron fertilizer has a significant yield increase effect. The boron fertilizer concentration is 0.05% to 0.1%.
Three Advocates
Potassium dihydrogen phosphate can be mixed and sprayed with trichlorfon, phoxim and pyrethroid pesticides. In addition, it can also be mixed with some growth hormones, such as naphthalene acetic acid and chlormequat.
The use of potassium dihydrogen phosphate has become very common. It not only promotes fruit expansion, color change, and crop metabolism, but also improves crop rooting, silicone oil frost resistance, and stress resistance. However, ultrafine potassium dihydrogen phosphate must be used rationally to achieve good results. Be sure to keep in mind the 8 taboos when using it.
