How often is potassium dihydrogen phosphate sprayed?

Potassium dihydrogen phosphate is often used for foliar spraying, usually once every 10-15 days. It is not recommended to spray several times in a row, too much spraying will thicken the leaves. So, what are the precautions for using potassium dihydrogen phosphate?

1. The period of validity of spraying: choose the peak period of phosphorus and potassium uptake by crops, such as the booting or heading and flowering stage of cereal crops such as wheat and rice, the moss stage to flowering stage of rape, before and after flowering of cotton, the tuber expansion period of potato crops, and so on.

2. to grasp the spraying time, it is not applied in rainy days, dew in the morning and noon in sunny days, it should be sprayed before 10:00 in the morning and after 4 o'clock in the afternoon. It can be sprayed all day in cloudy days.

3. When spraying, it is necessary to make more fertilizer and water on both the front and the back of the leaves. Don't walk too fast, be uniform.

4. Advocate reasonable mixed application of potassium dihydrogen phosphate and some nitrogen fertilizers, micro-fertilizers and pesticides, which can save labor and increase fertilizer and drug efficacy. In the fields with poor crop growth and lack of nitrogen, phosphorus and potassium, the suitable concentration of urea is generally required to be 1%-2%. In crops such as cotton, rape, wheat and other crops that are deficient in boron and have obvious effect on boron fertilizer, the effect of mixed application of potassium dihydrogen phosphate and boron fertilizer is significant, and the concentration of boron fertilizer is 0.1%-0.2%. Potassium dihydrogen phosphate can be sprayed mixed with non-alkaline pesticides or regulators.

5. Potassium dihydrogen phosphate promotes the reproductive growth of plants, which should not be applied in the nutritional stage of plants, so as to avoid drug damage and waste.

6. correctly judge the deficiency of phosphorus and potassium in the plant, because the two elements of phosphorus and potassium have high fluidity in the body, so when they are deficient, they are often shown on the old leaves and stems. In general, when the plant is potassium deficient, the leaves of the basal stem are variegated or green, the leaf margin is cup-shaped or wrinkled, there are necrotic spots between the veins or the tip and margin of the leaf, and the stem of the plant is thin and weak; when the phosphorus deficiency is serious, the plant is dark and red or purple, the basal leaf is yellow, the stem is short and thin, and the vein of the tender leaf is green.

7. In addition, foliar fertilizer spraying is only a supplement to plant fertilization, and must not replace base fertilizer and root topdressing. Plant roots have greater absorptive capacity and absorption system. However, the maximum absorption of leaves does not depend on the maximum absorption of roots. Therefore, foliar fertilizer is skillfully combined with root fertilization in order to achieve higher benefits.

Fertilization is an important step in the process of planting. You can't operate without understanding the current growth period of crops and the characteristics of fertilizer requirements.