Cotton Fertilizer Requirement And High Yield Fertilization Technology For Cotton Planting Knowledge

< p > < strong > < a > href= > http://www.91se91.com/news/ > cotton > /a > the law of fertilizer requirement is < /strong > /p >

< p > the role of three elements of nitrogen, phosphorus and potassium in cotton production.

Nitrogen has the most obvious effect on cotton and the longest time. From the beginning of seedling to the flowering and Bolling stage, an appropriate amount of nitrogen supply is needed.

The supply of nitrogen is moderate, cotton leaves are deep, plants are strong, bolls and bolls are numerous, yield is high, and quality is good.

If the supply of nitrogen is too high at seedling stage, it will lead to the growth of cotton. If the nitrogen supply is insufficient in the middle stage, the cotton leaves will turn yellow and fall off, resulting in premature senescence and low yield.

Excessive supply of nitrogen in the middle and later stage will cause cotton to grow wild, which will reduce the quality and seriously affect the yield.

Phosphorus can promote root development and strong seedling early in the early growth stage of cotton. It plays an important role in early flowering and early ripening, increasing boll weight and improving quality.

Potassium can play a role in strengthening healthy stems and increasing resistance to adverse factors.

When potassium is deficient, plants are susceptible to disease, leaves turn red and die early.

Cotton red leaf stem blight is mainly caused by potassium deficiency.

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< p > according to the test, every 100 kilograms of lint per kilogram takes about 13.35 kilograms of nitrogen, 4.65 kilograms of phosphorus and 13.35 kilograms of potassium from the soil.

Our test results showed that the yield of 100 kg seed cotton was 5 kg, 1.8 kg of phosphorus and 4.6 kg of potassium from soil.

The amount of nutrients absorbed by cotton at different growth stages is different.

According to the study, the number of N, P and K absorbed at seedling stage accounted for 5%, 3% and 3% of the total period, respectively. From bud to flower stage, they were 11%, 7% and 9% respectively, and reached the peak from the initial flowering stage to the flowering stage. They were 56%, 24% and 36% respectively.

From this we can see that the rule of fertilizer requirement in cotton growing period is: the peak period of fertilizer absorption is in the flowering and boll stage, the peak period of nitrogen absorption is in the flowering stage, and the peak of phosphorus and potassium absorption is from flowering stage to boll opening period.

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< p > < strong > cotton balance < a href= > http://www.91se91.com > fertilization > /a > /strong > /p >

< p > 1..

The base fertilizer should be mainly organic fertilizer, and the average quality of farm manure is about 4000 kg per mu.

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< p > 50 kg of cake fertilizer, 50~70 kg of phosphate fertilizer, 30 kg of ammonium bicarbonate, 15~20 kg of potassium chloride, 1 kg of zinc and boron can be mixed with organic fertilizer.

Or 3000~4000 kg of farmyard manure, and 20 kg of 52% cotton formula fertilizer.

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< p > 2. light fertilizer.

After the seedlings are pplanted slowly, it is beneficial to promote the early emergence of strong seedlings by looking at the base fertilizer and applying a certain amount of chemical fertilizer.

In the seedling stage, nitrogen is the main fertilizer, and 2.5 kg of urea and 25 kg of cake fertilizer are applied per mu.

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< p > 3. stable application of bud fertilizer.

The requirement of nutrient for cotton after bud emergence began to increase. Nitrogen, phosphorus and potassium in the bud stage accounted for 11%, 7% and 9% of the whole growth period respectively. During the bud stage, a certain amount of three yuan compound fertilizer, which was mainly composed of urea based compound fertilizer, should be applied to the bud stage, which could meet the needs of cotton seed production. However, to prevent excessive fertilizer and cause prolonged growth, we should grasp the stable application and Qiao Shi.

Generally, in the early stage of cotton emergence, nitrogen fertilizer, phosphorus and potassium are applied for 15% kg of compound fertilizer of 20~25 kg per mu in the early stage of cotton emergence. Three.

According to the experiment, the yield of the seedlings was less than that of the multiple bud fertilizer. The yield increased by 6.4% compared with that of the multiple bud fertilizer, and the yield increased by 8.4% compared with the less. The yield of the seedlings was less than 10%, indicating that the application of bud fertilizer was not critical.

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< p > 4..

Flower and boll fertilizer is the most nutrient requirement period for cotton, and the application of flower and boll fertilizer has a significant effect on the "three peach".

The amount of top dressing should be half or more of the total fertilizer during the whole growth period.

Generally speaking, when the cotton plant has 1~2 bolls, 52% kg of special fertilizer and 25~30 kg of urea are applied to the cotton.

The distance between fertilization and cotton roots is determined by the length of cotton fruit branches. Generally, furrow and deep soil are applied at 40 cm away from the main stem of the cotton plant.

However, the concrete operation should suit the local conditions, and the cotton field with fertility and vigorous growth should be applied late.

The cotton fields with poor soil fertility, less basal fertilizer and weak growth should be applied early. However, it is advisable to use more than 80% cotton plants and 1~2 young bolls.

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< p > 5., bu a href= "http://cailiao.sjfzxm.com/Matertial/show/default.aspx" > cover top fertilizer < /a >.

The top cover fertilizer mainly prevented the cotton from losing weight in early stage and premature senescence.

At this time, supplementary fertilizers generally do not take root topdressing, and more root dressing is applied.

For nitrogen deficient cotton fields, 1% ~ 1.5% urea solution can be sprayed for 50~75 kg, or spraying Lei Li 2000 liquid fertilizer, once every 5~7 days, for 2~3 times.

For the late maturing cotton fields with phosphorus deficiency and potassium deficiency or flourishing long greening, 7~10 times a day, a spray of 2000 times of liquid fertilizer and a mixture of thunder and liquid boron for 2~3 times, so as to achieve the purpose of no yellow leaves, no leaves, no premature decay, high yield and good quality.

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