Nitrogen fertilizer is mainly for the growth of leaves, through the transformation of chlorophyll into various nutrients to meet the growth of crops, and to promote the growth of branches, straw, and stems. Phosphorus determines the differentiation of flower buds, the elongation of pollen tubes, and the number and yield of fruits.

However, if the potassium fertilizer is used too little, although the crop stalks and stalks become thicker, no matter how much nutrients are stored and how many fruits are produced, it will only be flowers but not fruit, and the yield and quality will be low. Therefore, it is particularly important to supplement phosphorus and potassium fertilizers.

Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) is an excellent root fertilizer. It is a high-quality chlorine-free phosphorus potassium fertilizer with a high concentration and a very low salt value. , Potassium oxide 34%), Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) 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.

The use of Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) has been very common. Although it is an acidic fertilizer, dihydrogen phosphate ions and potassium ions can be absorbed separately, so it is a physiologically neutral fertilizer. High-quality Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) also has good water solubility. At 20°C, 100 grams of water can dissolve 22.6 grams, and its nutrient content is P2O5: 52%, K2O: 34%, and it has a utilization rate of more than 90%, so it is the first choice for foliar potassium fertilizer.

Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) contains two key macroelements, phosphorus and potassium.

As a "production worker", phosphorus has the functions of rooting, promoting flower bud differentiation, and providing energy for fruit expansion;

Potassium, as a "porter", can slow down aging, improve photosynthesis, promote nitrogen absorption, make crops mature early, increase fruit sugar and water, and enhance disease resistance and drought resistance in the late growth period.

Therefore, high-quality Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) can improve the yield, quality and commerciality of fruits as a whole.

Why is foliar potassium supplementation easily overlooked?

Potassium fertilizer foliar supplementation is often easily overlooked. One of the reasons is that people always think that potassium fertilizer or potassium-containing compound fertilizer has been applied to the soil, and there is no need to do more. In fact, the use of foliar potassium fertilizers in the middle and late stages of crop growth makes up for the decline in fertilizer absorption capacity caused by root aging, as well as the loss or solidification of potassium fertilizers caused by changes in soil pH and other reasons, ultimately leading to "potassium equals no potassium" ", so doing this is not only useless work, but it has the effect of making a difference.

The correct use of Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) must pay attention to the following:

1. Generally, foliar spraying is the main method

The spraying concentration is 0.3-0.5%%, spraying 2-3 times with an interval of 5-7 days. Grass crops such as rice and wheat can be used at a certain high concentration, but when using Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) at an ultra-high concentration, it is especially necessary to avoid high-temperature time. Generally, high-concentration use is not recommended in high-temperature seasons. Grass crops For example, wheat and rice can be sprayed with 100 grams of water and 15 kilograms of water. The concentration of Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) sprayed on the leaves of other crops should be cautious, and it is generally not recommended to use higher concentrations.

2. The best time to spray

Choose to spray during the critical period or peak period of crop absorption of phosphorus and potassium, the effect is the best, compared to if the tree is in the flower bud differentiation period and young fruit to coloring period, it can achieve better results, so that the flower buds are enlarged, the fruit is enlarged, and the coloring is uniform , Reduce pests and diseases.

3. Spraying method

When spraying, it is mainly sprayed on the back of the leaves, especially the leaves near the fruit. It is advisable to spray evenly without dripping.

4. Mixing situation

Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) can not only be mixed with boron fertilizers (boric acid, sodium octaborate tetrahydrate), molybdenum fertilizer (ammonium molybdate), but also with chelated medium and trace element fertilizers. At the same time, it can also be mixed with most acidic and neutral fungicides and insecticides, which can play a synergistic effect.

Three Advocates and Three Prohibitions

Advocate 1: Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) and some nitrogen fertilizers, boron fertilizers and molybdenum fertilizers, chelated micro-fertilizers and pesticides should be mixed in a reasonable way, which can save labor and increase fertilizer and drug effects. In the fields where the crops grow poorly and lack nitrogen, phosphorus, and potassium, mixed application is carried out. Generally, the appropriate concentration of urea solution is required to be 0.5-1%.

Advocate 2: mixed application of Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) and boron fertilizer. In crops that are deficient in boron and have significant effects on boron fertilizer, the mixed application of Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) and boron fertilizer has a significant effect on increasing yield, and the concentration of boron fertilizer is 0.1%.

Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) can be mixed with boron fertilizers such as boric acid and sodium octaborate tetrahydrate. Since boric acid is an industrial dangerous control product, there are certain mandatory requirements for storage. It is rare to buy simple boric acid fertilizers on the market, so we generally recommend micro-boron and Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) (potassium phosphorus bank) to be used together. Micro-boron, the kind that dissolves in cold water, contains more than 20.5% pure boron, and is an efficient boron supplement preparation.

Advocate 3: Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) can be mixed with trichlorfon and pyrethroids for spraying. In addition, it can also be mixed with some growth hormones, such as naphthaleneacetic acid and chlormequat.

Prohibition 1: Alkaline products should not be mixed with Potassium dihydrogen phosphate (Monopotassium phosphate, MKP), such as Bordeaux mixture, copper hydroxide, etc. The pH of the aqueous solution of 1% Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) is about 4.6, which is slightly acidic. When mixed with alkaline fertilizers and pesticides, chemical reactions will occur, and abnormal phenomena such as flocculation, precipitation, discoloration, heat generation, and bubble generation will occur at this time. Lead to the failure of Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) function.

Prohibition 2: Products containing carbonate (CO3-) should not be mixed with Potassium dihydrogen phosphate (Monopotassium phosphate, MKP). Because the hydrogen ions of carbonate and Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) react to generate CO2 gas. Such as potassium carbonate, sodium bicarbonate, etc.

Prohibition 3: Products that can react with dihydrogen phosphate should not be mixed with Potassium dihydrogen phosphate (Monopotassium phosphate, MKP). Because this kind of product will react with dihydrogen phosphate ion to form flocculation and precipitation.

Potassium dihydrogen phosphate (Monopotassium phosphate, MKP) cannot be mixed with zinc sulfate, ferrous sulfate, manganese sulfate, copper sulfate and other fertilizer products. Even zinc sugar alcohol is not suitable for mixing with Potassium dihydrogen phosphate (Monopotassium phosphate, MKP).

Mancozeb, anti-virus alum, metalaxyl mancozeb, copper hydroxide, basic copper sulfate, copper calcium sulfate, Bordeaux mixture, cuprous oxide, and copper ammonia in pesticides cannot be mixed with Potassium dihydrogen phosphate (Monopotassium phosphate, MKP).