Cotton leaf surface spray in August
2022-10-21 11:11:44
Since the content of available potassium (including water-soluble potassium and available potassium) in the soil decreases year by year, effective potassium has become the first demand for cotton nutrition and physiology. When 30-40 kg of high-quality potassium fertilizer is applied to the base fertilizer, due to the consumption of cotton growth and development, and leaching after heavy rain, the effective potassium content in the soil will drop to the original level in August.
In August, with the deterioration of soil permeability and the decrease of ground temperature after cotton field closure, the soil potassium supply capacity is gradually weakened. If potassium fertilizer cannot be added in time, it will show obvious potassium deficiency. Potassium deficiency in cotton is first expressed from the lower old leaves. Generally, the veins remain green, while the mesophyll partially fades. Because potassium is more active in plants, it is concentrated in young, metabolically active parts. When cotton plants are deficient in potassium, potassium is first transferred from old leaves to young tissues. For example, in the middle of September, the potassium-deficient cotton field suddenly suffered from low-temperature rainfall, and the supply of available potassium in the soil was almost interrupted. When the basic potassium nutrition of cotton leaves could not be maintained, the cotton plants suddenly showed physiological failure, and the cotton leaves changed rapidly within two or three days. Yellow or red, then dry and fall off, stems die, cotton plants die, which is also known as red leaf stem blight, then it is too late to take any measures.
Therefore, mid-August is the key period for potassium supplementation in cotton, and foliar application of potassium is the most cost-effective method for potassium supplementation. Effective potassium supplementation must be applied before cotton plants are severely deficient in potassium. If the cotton plant is in a state of severe potassium deficiency in August, it will not be replenished in time, which will result in a decrease in the upper bell ringing or no bell, small bells, delayed bolls, reduced clothing scores, leaf loss, and even death of the whole plant. Serious consequences, there have been many painful lessons in previous years.
What kind of potash type is best for foliar spray? There are four principles of fertilizer selection: (1) the principle of high potassium; (2) the principle of high solubility; (3) the principle of easy absorption and utilization and safety; (4) the principle of low input. According to the above four principles, potassium sulfate is the best foliar spray fertilizer variety: (1) high-quality potassium sulfate contains more than 50% potassium oxide, which is much higher than any other compounded potassium fertilizer varieties. 1 kg, can provide cotton with the potassium needed to produce 10 kg of seed cotton; (2) soluble in water, at 30 ° C, can dissolve 13 g of potassium sulfate per 100 g of water, easy to spray under any conditions; It is easy to be absorbed and utilized by cotton, and it is safe and reliable in a certain spraying concentration; (4) Calculated according to the effective component of the unit, the price is lower than any other potash varieties.
Spraying method: the concentration is 2%, and the liquid spray is 60 kg. Only the upper part of the cotton plant is sprayed, and the front and back sides of the blade are sprayed wet. The spraying time should be avoided after 10 am to 3 pm. During the period of maximum evaporation, the finer the fog point is, the safer the cotton is. Be careful not to re-spray the cotton plants on the ground, spray once every seven or eight days, and spray three times. If mixed with pesticides, reduce the amount of fertilizer and increase the number of sprays. According to the practical experience of cotton farmers, the powdered potassium sulfate produced in Russia has the best effect, with potassium oxide up to 52%, fast dissolution and almost no precipitation. The large-particle potassium sulfate, which is not well soluble, is not suitable for foliar spray application. The second and third grade potassium sulfate has a low potassium content and a large amount of filler, which is not suitable for spraying fertilizer. Potassium chloride contains up to 60% potassium oxide and dissolves well, but cotton leaves are sensitive to chloride ions. For foliar spray fertilizer, 1% concentration should be used to ensure safety.
Potassium dihydrogen phosphate is an outdated cotton foliar fertilizer with low potassium content, high phosphorus content, low spray concentration and high input. It is suitable for cotton fields with less potassium in the 1970s and 1980s. In cotton fields with severe potassium deficiency, spraying potassium dihydrogen phosphate is far from satisfying the potassium craving of cotton plants. In prematurely depleted cotton fields, early-maturing cotton fields, and cotton fields with strong reproductive growth and weak nutrient growth, phosphorus can no longer be sprayed. Potassium dihydrogen phosphate is suitable for use in cotton fields where vegetative growth is excessive and late maturing.
Potassium nitrate is a gunpowder and industrial raw material. It is expensive and has a high input. It is suitable for cotton fields that are both potassium-deficient and nitrogen-depleted in the later stage.
The "potassium sulfate type compound fertilizer" is a compound fertilizer, not a potash fertilizer, and has a low potassium content, and cannot be used as a potash fertilizer.
In general, the cotton field is the easiest to spray high-quality potassium sulfate, and it is also economical. It has been proved that it can achieve better potassium supplementation.
In August, with the deterioration of soil permeability and the decrease of ground temperature after cotton field closure, the soil potassium supply capacity is gradually weakened. If potassium fertilizer cannot be added in time, it will show obvious potassium deficiency. Potassium deficiency in cotton is first expressed from the lower old leaves. Generally, the veins remain green, while the mesophyll partially fades. Because potassium is more active in plants, it is concentrated in young, metabolically active parts. When cotton plants are deficient in potassium, potassium is first transferred from old leaves to young tissues. For example, in the middle of September, the potassium-deficient cotton field suddenly suffered from low-temperature rainfall, and the supply of available potassium in the soil was almost interrupted. When the basic potassium nutrition of cotton leaves could not be maintained, the cotton plants suddenly showed physiological failure, and the cotton leaves changed rapidly within two or three days. Yellow or red, then dry and fall off, stems die, cotton plants die, which is also known as red leaf stem blight, then it is too late to take any measures.
Therefore, mid-August is the key period for potassium supplementation in cotton, and foliar application of potassium is the most cost-effective method for potassium supplementation. Effective potassium supplementation must be applied before cotton plants are severely deficient in potassium. If the cotton plant is in a state of severe potassium deficiency in August, it will not be replenished in time, which will result in a decrease in the upper bell ringing or no bell, small bells, delayed bolls, reduced clothing scores, leaf loss, and even death of the whole plant. Serious consequences, there have been many painful lessons in previous years.
What kind of potash type is best for foliar spray? There are four principles of fertilizer selection: (1) the principle of high potassium; (2) the principle of high solubility; (3) the principle of easy absorption and utilization and safety; (4) the principle of low input. According to the above four principles, potassium sulfate is the best foliar spray fertilizer variety: (1) high-quality potassium sulfate contains more than 50% potassium oxide, which is much higher than any other compounded potassium fertilizer varieties. 1 kg, can provide cotton with the potassium needed to produce 10 kg of seed cotton; (2) soluble in water, at 30 ° C, can dissolve 13 g of potassium sulfate per 100 g of water, easy to spray under any conditions; It is easy to be absorbed and utilized by cotton, and it is safe and reliable in a certain spraying concentration; (4) Calculated according to the effective component of the unit, the price is lower than any other potash varieties.
Spraying method: the concentration is 2%, and the liquid spray is 60 kg. Only the upper part of the cotton plant is sprayed, and the front and back sides of the blade are sprayed wet. The spraying time should be avoided after 10 am to 3 pm. During the period of maximum evaporation, the finer the fog point is, the safer the cotton is. Be careful not to re-spray the cotton plants on the ground, spray once every seven or eight days, and spray three times. If mixed with pesticides, reduce the amount of fertilizer and increase the number of sprays. According to the practical experience of cotton farmers, the powdered potassium sulfate produced in Russia has the best effect, with potassium oxide up to 52%, fast dissolution and almost no precipitation. The large-particle potassium sulfate, which is not well soluble, is not suitable for foliar spray application. The second and third grade potassium sulfate has a low potassium content and a large amount of filler, which is not suitable for spraying fertilizer. Potassium chloride contains up to 60% potassium oxide and dissolves well, but cotton leaves are sensitive to chloride ions. For foliar spray fertilizer, 1% concentration should be used to ensure safety.
Potassium dihydrogen phosphate is an outdated cotton foliar fertilizer with low potassium content, high phosphorus content, low spray concentration and high input. It is suitable for cotton fields with less potassium in the 1970s and 1980s. In cotton fields with severe potassium deficiency, spraying potassium dihydrogen phosphate is far from satisfying the potassium craving of cotton plants. In prematurely depleted cotton fields, early-maturing cotton fields, and cotton fields with strong reproductive growth and weak nutrient growth, phosphorus can no longer be sprayed. Potassium dihydrogen phosphate is suitable for use in cotton fields where vegetative growth is excessive and late maturing.
Potassium nitrate is a gunpowder and industrial raw material. It is expensive and has a high input. It is suitable for cotton fields that are both potassium-deficient and nitrogen-depleted in the later stage.
The "potassium sulfate type compound fertilizer" is a compound fertilizer, not a potash fertilizer, and has a low potassium content, and cannot be used as a potash fertilizer.
In general, the cotton field is the easiest to spray high-quality potassium sulfate, and it is also economical. It has been proved that it can achieve better potassium supplementation.
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