The foliar spray fertilizer of cotton has the advantages of provincial fertilizer, quick effect, and not limited by soil conditions. It is an important increase measure for the rapid nutrient supplementation of cotton plants in the later period of cotton growth, especially after the beginning of autumn. Why do you say this way?
Many studies have shown that the nutrient absorbed by the leaves can be run and assimilated in the body just like the nutrient absorbed in the root. Top dressing outside the root is a way for the plant to obtain nutrients. Spraying the leaves at later stages can also slow down the aging of the roots. Further studies have shown that there are many fine structures on the outer wall of the leaf epidermal cells, such as fine structures in the cells of the cells of the pores, at the base of the leaf hairs and around, and on the epidermal cells of the veins. These pores make the cell protoplasm directly related to the outside world. It is the passage of nutrients into the cell's protoplasm and is an active process of absorption.
After the beginning of autumn, cotton has entered the late stage of flowering. The ability of roots to absorb nutrients has been weakened. The upper cotton buds have continued to grow and develop. There are many fertilizer-less fields in the fertilizer-lost cotton fields or in the middle and lower parts, and the upper malnutrition cotton fields are positive. It is an important plot of foliar spray fertilizer. In the cotton fields where potassium fertilizer is not applied or where early rain is large, the symptoms of potassium deficiency have already appeared in the old leaves of the lower part. With the increase of the number of bells and the increase of rainfall, the shortage of potassium will be further aggravated. If the available potassium is not timely supplemented, it will Causes premature onset of illness, small bells, and poor boll opening, and even serious cotton plants die. Therefore, spraying potassium at the later stage is a necessary increase in production technology in most cotton fields.
Potassium fertilizers are most suitable for high-quality potassium sulfate, and high-quality potassium sulfate is also called first-grade potassium sulfate and contains more than 50% potassium oxide (K2O). Dosage form should be selected as water-soluble powders or microcrystals. Any other potassium-containing foliar fertilizer cannot reach the potassium content of potassium sulfate. Therefore, potassium sulfate is the most affordable and safest type of foliar spray fertilizer. Such as the Russian-made "Aip", potassium sulfate up to 52% potassium, very soluble in water (at 30 °C, every 100 grams of water can be dissolved in 13 grams of potassium sulfate). According to the mu spray 3 times, each spray fertilizer 0.6 kg/mu, and the utilization rate of 70%, potassium can be absorbed and used 0.66 kg/mu. These potassium can meet the need of 15 kg of seed cotton per mu.
Spraying method When spraying fertilizer, both sides of the cotton leaf should be sprayed wet. From the perspective of leaf structure, the epidermis under the epidermis of the leaf blade is spongy, relatively loose, with large intercellular spaces and more cells in the perforation. The structure of the epidermis on the leaf surface is denser, the absorption of nutrients is less than that on the back of the leaf, and it is slow, so when spraying, strive to seek Both sides of the blade are fully covered with solution. Per mu of spray should not be less than 30 kg, of which potassium sulfate 0.6 kg (2% of the concentration), mainly sprayed on both sides of the top half of the cotton plant.
Spraying time is the most suitable for windless weather in the late afternoon. The longer the fertilizer liquid is, the longer the wetted leaves are. It is generally required that the wetting time be maintained for 0.5 to 1 hour, so it is best to spray in cloudy weather or cloudy days in the evening.
Single Hand Crutches,Aluminum Crutches,Adult Aluminum Crutches,Medical Crutches
Hebei Dingli Medical Apparatus and Instrument Co., LTD , https://www.dinglimed.com