The Main Points Of Cotton Fertilization Are: &Nbsp Should Be "Light".

stay

There was little nitrogen uptake in cotton seedlings from light seedling stage to bud stage, but less than 10%. However, seedling stage is critical period of phosphorus nutrition, but phosphorus is scarce, and it can not be deficient in phosphorus. When planting cotton, 5 kg of diammonium phosphate is used as seed fertilizer.

The position of seed fertilizer is about 2 cm below the side of the cotton plant.

Phosphorus based fertilizer is needed for the seedling stage of cotton, which can promote root development and ensure seedling growth.

Bud fertilizer "stable" maintains seedling stage to bud stage, controls water and nitrogen control and cultivator squat seedling, so as not to form cotton steep and long to lay down the root of the disaster.

Flower boll fertilizer "heavy" flowering period is the most vigorous period of cotton growth. It needs more fertilizer, more nitrogen and greater intensity, and the nitrogen uptake in this period is 60%.

Phosphorus and potassium also account for more than half of the bolls from the boll to the ripening stage.

At the same time, the contradiction between group growth and individual fertility often occurs in flower and boll stage. High yield cotton should pay close attention to water and nitrogen management, reduce flower and boll abscission, and achieve high yield characteristics of peach bearing, peach filling waist and autumn peach top.

During the flowering and boll stage, the top dressing is mainly to add an appropriate amount of nitrogen fertilizer (such as 10-15 kg / mu urea), but in the case of no potash fertilizer in the potassium deficient soil or basal fertilizer, the additional 5 kg of potassium chloride should be added.

Especially for those plots planted with insect resistant cotton varieties, the amount of potash fertilizer is higher than that of ordinary varieties of 3.

After the autumn, the cotton fields with high yield and super high yield should be supplemented as appropriate. Once the growth momentum of cotton bolls is weakened or automatically capped, the urea should be added 5-8 kilograms in time to prevent the premature decline of cotton plants and strive for autumn peach.

In short, in the top dressing of High-yielding Cotton, we should grasp the essentials of Sheng Lei - the first flower to catch up with the first fertilizer, the flower and the bell to catch second fertilizer, and the latter to make up the fertilizer according to the circumstances.

For insect resistant cotton varieties, the amount of potash fertilizer is higher than that of ordinary varieties of 3.

The method of top dressing should be mixed with soil and water in time, and urea should not be applied in order to avoid volatilization loss or fumigate cotton leaves.

Some urea is sprinkled on the ground surface for rain, neither soil nor irrigation. This method is not scientific.