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In order to make the upper part not to be de-fertilized, to make more bells and knot large bells, it is necessary to supplement the cotton plants; therefore, the current ministers of peach, central flowering, and upper buds are in urgent need of a large supply of available nutrients; otherwise, it will cause central The flower is malnourished and falls off, or the upper part of the middle peach is malnourished and falls off. This is the main reason for the unsatisfactory yield of many cotton fields in previous years. If the upper fruit branches are empty or the bells are small, the production will be reduced. Unless it is a very fertile cotton field, most cotton fields must be replenished in time after topping.
According to the fixed-point survey of several varieties by Guoxin Cotton Institute in the past few years, the period from July 25 to July 31 is the period in which the cotton plant has the strongest ringing strength. In the case of 2000 plants, the individual planting bell day Increase by 0.7 to 0.9, an average of 0.8, that is, the increase in the number of acres into 1600. It can be seen that this time is also the time when the cotton plant absorbs the maximum available nutrient strength.
According to the survey data of cotton hybrid farming provided by the director of Guoxin Quality Inspection Center Gao Zhihua: After two or three days of topping, the flowering peak appeared, and 2 to 3 flowers per plant per day, an average of 2.5, can last for one week. about. According to the calculation of 1600 acres, the average acre is about 4,000 flowers per day. This is also the second half of July to the beginning of August. It is consistent with the results of the ringing survey of the cotton institute.
The cotton farmers who visited the Guoxin Park in Hejian District are deeply impressed. Every year, the display fields of the cotton plant can realize the top of the autumn peach, and the upper part is large. Xu Dongyong’s long-standing mystery: After the topping every year, the urea-based foliar fertilizer was sprayed every five days for a total of five times, and it was sprayed until mid-August. In the early stage, nitrogen supplementation was the main factor, and potassium supplementation was the main stage.
On the afternoon of July 24th, the cotton field showed the first man-machine combined spraying operation. Xu’s experience: The first time you spray the fertilizer, you can’t be late, otherwise it will affect the effect. According to observations, as long as the young buds within 10 days do not change yellow, the spray fertilizer is still effective. Once the big buds turn yellow, they will be taken off, and the spray will be ineffective.
For foliar spray fertilizer in July, the author still recommends urea as the first choice. To ensure that the upper fruit branches do not de-fertilize, first of all, to meet the demand for quick-acting nitrogen in cotton plants, if nitrogen is scarce, other elements can not be replaced by spraying. Moreover, urea has the highest nitrogen content and is the most affordable.
There are some cotton fields in the north, and the recent rainfall is relatively large. The soil moisture in the cotton field is saturated, the root system is not well ventilated, and the ability to absorb nutrients is reduced. In this case, foliar spray is even more irreplaceable. This double-pronged approach ensures that the top of the cotton plant does not de-fertilize. The soil is too dry and too wet, or the wet and dry alternately, can promote the roots to premature aging.
Do not underestimate the effect of foliar spray fertilizer on the nutrition of supplemented cotton plants. 0.5 kg of urea contains 0.23 kg of pure nitrogen. If it is absorbed by 1 mu of cotton plant, it can meet the nitrogen demand of 1 thousand cotton boll development. In order to increase production, 25 kg of water per mu and 0.5 kg of urea are sprayed once, which is worthwhile; if it is sprayed three times, it may increase the cotton by 15 kg.
At present, a small number of early-onset cotton fields or varieties sensitive to potassium deficiency have yellowish leaves in the lower part of the rain. This is a typical symptom of potassium deficiency, which can be mixed with nitrogen and potassium. Most cotton fields can be sprayed again in early August. Potassium sulphate fertilizer is still used at 2% concentration, high potassium content, and very safe.
Author: Liu Chun Taiwan
Source: Hebei Farmers Daily
According to the fixed-point survey of several varieties by Guoxin Cotton Institute in the past few years, the period from July 25 to July 31 is the period in which the cotton plant has the strongest ringing strength. In the case of 2000 plants, the individual planting bell day Increase by 0.7 to 0.9, an average of 0.8, that is, the increase in the number of acres into 1600. It can be seen that this time is also the time when the cotton plant absorbs the maximum available nutrient strength.
According to the survey data of cotton hybrid farming provided by the director of Guoxin Quality Inspection Center Gao Zhihua: After two or three days of topping, the flowering peak appeared, and 2 to 3 flowers per plant per day, an average of 2.5, can last for one week. about. According to the calculation of 1600 acres, the average acre is about 4,000 flowers per day. This is also the second half of July to the beginning of August. It is consistent with the results of the ringing survey of the cotton institute.
The cotton farmers who visited the Guoxin Park in Hejian District are deeply impressed. Every year, the display fields of the cotton plant can realize the top of the autumn peach, and the upper part is large. Xu Dongyong’s long-standing mystery: After the topping every year, the urea-based foliar fertilizer was sprayed every five days for a total of five times, and it was sprayed until mid-August. In the early stage, nitrogen supplementation was the main factor, and potassium supplementation was the main stage.
On the afternoon of July 24th, the cotton field showed the first man-machine combined spraying operation. Xu’s experience: The first time you spray the fertilizer, you can’t be late, otherwise it will affect the effect. According to observations, as long as the young buds within 10 days do not change yellow, the spray fertilizer is still effective. Once the big buds turn yellow, they will be taken off, and the spray will be ineffective.
For foliar spray fertilizer in July, the author still recommends urea as the first choice. To ensure that the upper fruit branches do not de-fertilize, first of all, to meet the demand for quick-acting nitrogen in cotton plants, if nitrogen is scarce, other elements can not be replaced by spraying. Moreover, urea has the highest nitrogen content and is the most affordable.
There are some cotton fields in the north, and the recent rainfall is relatively large. The soil moisture in the cotton field is saturated, the root system is not well ventilated, and the ability to absorb nutrients is reduced. In this case, foliar spray is even more irreplaceable. This double-pronged approach ensures that the top of the cotton plant does not de-fertilize. The soil is too dry and too wet, or the wet and dry alternately, can promote the roots to premature aging.
Do not underestimate the effect of foliar spray fertilizer on the nutrition of supplemented cotton plants. 0.5 kg of urea contains 0.23 kg of pure nitrogen. If it is absorbed by 1 mu of cotton plant, it can meet the nitrogen demand of 1 thousand cotton boll development. In order to increase production, 25 kg of water per mu and 0.5 kg of urea are sprayed once, which is worthwhile; if it is sprayed three times, it may increase the cotton by 15 kg.
At present, a small number of early-onset cotton fields or varieties sensitive to potassium deficiency have yellowish leaves in the lower part of the rain. This is a typical symptom of potassium deficiency, which can be mixed with nitrogen and potassium. Most cotton fields can be sprayed again in early August. Potassium sulphate fertilizer is still used at 2% concentration, high potassium content, and very safe.
Author: Liu Chun Taiwan
Source: Hebei Farmers Daily
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