How Often Should You Spray Monopotassium Phosphate? Master the Correct Spraying Frequency

Monopotassium phosphate is commonly used for foliar spraying, generally sprayed once every 10-15 days. It is not recommended to spray it repeatedly in succession; too much spraying will cause the leaves to thicken. So, what are the precautions for using monopotassium phosphate?

1. Spraying timing: choose the peak period when the crop absorbs phosphorus and potassium nutrients, for example, the booting or heading and flowering stage of cereal crops such as wheat and rice; the bolting stage to flowering stage of rapeseed; before and after the flowering of cotton; the tuber bulking stage of root and tuber crops, etc.

2. Timing of spraying: do not spray on rainy days, do not spray when there is morning dew, do not spray at noon on sunny days; it is best to spray before 10 a.m. and after 4 p.m., and on cloudy days you can spray all day long.

3. When spraying, make sure both the front and back of the leaves can pick up more fertilizer solution. Do not walk too fast; keep it uniform and consistent.

4. It is recommended to reasonably mix monopotassium phosphate with some nitrogen fertilizers, micronutrient fertilizers and pesticides, which can save labor and increase fertilizer and pesticide efficacy. In fields where crops grow poorly and are deficient in nitrogen, phosphorus and potassium, mixed application is carried out; generally the suitable concentration of urea solution is required to be 1%-2%; for crops that are deficient in boron and respond noticeably to boron fertilizer, such as cotton, rapeseed and wheat, mixing monopotassium phosphate with boron fertilizer has a significant yield-increasing effect, and the boron fertilizer concentration is 0.1%-0.2%. Monopotassium phosphate can be mixed with non-alkaline pesticides for spraying, and can also be mixed with regulators for spraying.

5. Monopotassium phosphate promotes the reproductive growth of plants, so it should not be applied during the vegetative stage of the plant, to avoid causing phytotoxicity and waste.

6. Correctly judge whether the plant is deficient in phosphorus or potassium. Since these two elements, phosphorus and potassium, are highly mobile within the plant, deficiencies are often shown on the old leaves and flowering stems. Under normal circumstances, when a plant is deficient in potassium, the leaves at the base of the stem appear mottled or lack green, the leaf margins curl upward in a cup shape or become wrinkled, there are necrotic spots between the veins or at the leaf tips and margins, and the plant stems are thin and weak; when phosphorus deficiency is severe, the plant takes on a dark color, often turning red or purple, the basal leaves turn yellow, the stems are short and thin, and the veins of the young leaves lose their green color.

7. In addition, foliar feeding is only a supplement to plant fertilization and must never replace base fertilizer and root topdressing. Plant roots have a greater absorption capacity and absorption system. However, the maximum absorption of the leaves does not depend on the maximum absorption of the roots. Therefore, combining foliar fertilizer with root fertilization skillfully is the way to achieve higher benefits.

In the process of planting, fertilizing is a relatively important step. You should not carry out the operation without understanding the current growth stage of the crop and its fertilizer requirements.