Potassium dihydrogen phosphate is a very commonly used foliar fertilizer. It is a high-concentration, high-quality, 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 "universal fertilizer".

The specific role of potassium dihydrogen phosphate

1. Promote the absorption of nitrogen and phosphorus

Potassium dihydrogen phosphate can promote the absorption of nitrogen and phosphorus by crops, quickly supplement phosphorus and potassium, increase crop yield and 1000-grain weight, and can play a special role in the special biological period of crops.

2. Promote photosynthesis

Potassium enhances crop photosynthesis during crop growth and accelerates the production and transformation of nutrients.

3. Improve crop resistance

Potassium dihydrogen phosphate can improve the stress resistance of crops, such as drought resistance, resistance to dry and hot wind, resistance to waterlogging, resistance to freezing, resistance to damage, and to promote healing

 Combination, resistance to pathogen infection, etc.

4. Improve fruit quality

Spraying during the fruit swelling period can preserve and strengthen the fruit, promote fruit swelling, improve fruit quality, increase coloring, and improve taste.

5. Regulate crop growth

Potassium dihydrogen phosphate has the effect of a regulator, which can promote the differentiation of crop flower buds, increase the number of flowering, strong flower buds, strengthen flowers and preserve fruit, improve fruit setting, and effectively promote the growth and development of roots.

However, some people may have used potassium dihydrogen phosphate for more than ten years, and these eight taboos of potassium dihydrogen phosphate may not necessarily be known!

First of all, in chemical reaction, phosphate and these metal ions are insoluble in water.

In practical applications, it can also be mixed at low concentrations, but some need to be prepared for immediate use, long-term storage will precipitate, and some mixed use it to precipitate! According to various field tests, these eight taboos must be paid attention to!

Eight taboos for using potassium dihydrogen phosphate

1. Do not mix with alkaline products:

The pH of 1% potassium dihydrogen phosphate aqueous solution is around 4.6, which is slightly acidic. It will occur when mixed with alkaline fertilizers and pesticides.

 Chemical reaction, there will be abnormal chemical reactions such as flocculation, precipitation, discoloration, heat generation, and bubble generation. At this time, it will cause the function of potassium dihydrogen phosphate to fail.

The alkaline pesticides that cannot be mixed are Bordeaux mixture, lime sulfur mixture, copper hydroxide (which can be killed), rosin mixture, dipotassium tetrachloride sodium, bensulfuron-methyl (weakly alkaline), and sodium pentachlorophenate. The alkaline fertilizers are: ammonia, lime, plant ash, calcium magnesium phosphate, ammonium bicarbonate, etc.

2. It is forbidden to mix with products containing carbonate (CO3-).

Carbon dioxide (CO2) gas is generated due to the reaction of carbonate and hydrogen ions of potassium dihydrogen phosphate. Such as potassium carbonate, ammonium bicarbonate, ammonium bicarbonate, sodium bicarbonate and so on.

3. It is forbidden to mix with products containing copper ions

Potassium dihydrogen phosphate cannot be mixed with copper preparations such as copper hydroxide, basic copper sulfate, copper calcium sulfate, cuprous oxide, copper complex, copper quinoline, etc. These free copper ions will react with phosphate ions to form flocs Knot, precipitation.

4. It is forbidden to mix with free medium and micro-elements (calcium, magnesium, zinc, iron), and the sugar-alcohol state is prepared for immediate use.

These free metal ions will react with phosphate ions to form flocculation and precipitation, such as calcium, magnesium, zinc, iron, and manganese products.

Sugar-alcohol state is easy to decompose when exposed to light or high temperature, and medium and small elements become free ion state, and flocculent precipitation may also occur. It is recommended that the current use is not long set.

Inorganic salts are in the free state, so they cannot be mixed with fertilizers such as zinc sulfate, ferrous sulfate, manganese sulfate, and copper sulfate.

Mancozeb, mancozeb, antitoxin, metalaxyl mancozeb, etc. in pesticides cannot be mixed! Mixing with mancozeb will cause precipitation and produce toxic gas.

However, the chelated EDTA will not react with potassium dihydrogen phosphate, because the chelated medium and small elements will complex these ions, which is more stable and will not produce free metal ions.

5. Excessive use in the early growth period is prohibited

Potassium has an antagonistic effect with magnesium and calcium ions, affecting the absorption of these two types of ions, which is not conducive to the growth of plant cells, affects the growth of plant seedlings, and has a greater impact on the later yield. Therefore, it is not recommended to use potassium dihydrogen phosphate at the seedling stage (1-3 leaves) of vegetables and legumes and before the flowering stage, so as to avoid damage to seedlings, flower and pod, and if used on soybeans too early, it will reduce yield.

6. It is forbidden to substitute potassium dihydrogen phosphate for basal fertilizer

Because potassium dihydrogen phosphate is very water-soluble, it is easy to dissolve in water, and it is easily washed away by rain when buried deep in the soil. The effect is short, so it is not recommended to be used as a base fertilizer. The base fertilizer should still be used as a compound fertilizer. effect. Potassium dihydrogen phosphate has good water solubility and strong quick-acting effect. It can be used for leaf spray during key periods such as flower bud differentiation and root flushing.

7. It is forbidden to use in high temperature time and high concentration

High temperature will increase the concentration of potassium dihydrogen phosphate solution and easily cause fertilizer damage. If the concentration is too high, it will also cause fertilizer damage to burn leaves and roots. The time for spraying potassium dihydrogen phosphate should avoid the noon high temperature period. It is best to use it before 10 am or after 4 pm. High-concentration leaf spray is prohibited in the hot season.

For gramineous crops, wheat, rice and other crops can be sprayed at 300-500 times. For other crops, it is recommended to spray at a concentration of 500-800 times. The dilution factor should not be less than 300 times, preferably more than 500 times.

8. It is forbidden to emulsifiable concentrate and potassium dihydrogen phosphate

When mixed with emulsifiable concentrate pesticides, add emulsifiable concentrates at the end to avoid affecting the dissolution of potassium dihydrogen phosphate. Because the emulsifiable concentrate was added first, and then potassium dihydrogen phosphate, there was no secondary dilution, so the oil encapsulated the potassium dihydrogen phosphate particles. Therefore, when dispensing the medicine, the powder and granules must be dissolved first, and the emulsifiable concentrate must be added last.

Three proposals for mixing potassium dihydrogen phosphate

Advocate

A reasonable mixture of potassium dihydrogen phosphate and some nitrogen fertilizers, micro-fertilizers and pesticides can save labor and increase fertilizer efficiency and medicine efficiency.

Mixed application is implemented in fields with poor crop growth and lack of nitrogen, phosphorus, and potassium. Generally, the appropriate concentration of urea solution is 1% to 2%.

Two advocate

Mixed application of potassium dihydrogen phosphate and boron fertilizer. In crops that are deficient in boron and have significant effects on boron fertilizers, the mixed application of potassium dihydrogen phosphate and boron fertilizer has a significant effect on yield increase, and 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 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 swelling, color change, and promotes crop metabolism, but also improves crop rooting, frost resistance, and stress resistance. However, it is necessary to use ultra-fine powder potassium dihydrogen phosphate to achieve good results. The 8 taboos must be kept in mind.