After world war ii, the main characteristics of the world cotton production pattern are:
First, after the rapid growth of cotton production in the 1950s, it began to shift from the 1960s to the slow growth of climbing type. The annual growth of world cotton output and consumption is basically in line with the growth rate of world population and the improvement of human living standard.
Second, the total area of cotton planting has not changed much, and the growth of world cotton output mainly depends on the increase of yield per unit area. Due to the high value of cotton, cotton producing countries pay more attention to improving cotton yield per unit area. China has the highest cotton yield per unit area, followed by the United States, uzbekistan and other countries.
Third, since the 1980s, China has become the largest cotton producer. China, the United States, India, Pakistan and uzbekistan produce more than a million tons of cotton.
Fourth, in terms of raw cotton consumption, China ranks first in the world.
Cotton is a kind of crop that needs a lot of fertilizer. In the later growth stage of cotton, the root system gradually ages and the ability to absorb nutrients is weakened. At this time, the middle and upper cotton boll are still in the filling stage and need certain nutrient supply. The middle of the flour fertilizer is a kind of very important fertilizer.
Application type of cotton foliar fertilizer:
1. Nitrogen injection to prevent premature aging
When the cotton was short of nitrogen, the leaves were light green, the lower leaves were yellow and withered, and the early stage of flocculation was a decline phenomenon, which affected the cotton yield and quality. Nitrogen spraying on the leaf surface can keep the leaf green, improve the photosynthetic efficiency of the plant and prevent premature aging.
2. Potassium spraying to prevent disease
Potassium deficiency in flowering and boll stage is prone to red leaf and stem blight. After cotton plant onset, cotton leaves become red or yellow, thicken and shrivel easily and brittle, and finally fall off, causing premature aging of cotton plant. Potassium spraying on the leaf surface can alleviate or inhibit the occurrence of diseases.
3. Phosphorus spraying promotes early maturity
Phosphorus can promote the operation of organic nutrients in cotton, promote full seeds, increase boll weight, and early flocculation. Cotton boll peak is the peak of phosphorus demand.
4. Boron spray attack peach
Boron can promote other nutrients to enter the cotton plant, promote root system growth and development, flowering and fruiting. When cotton is short of boron, fruit branch position is high, side branch is much, petiole shows annulus, leaf leaf atrophy, fruit branch is dense much, plant is short, the leaf of bud is big to 1 centimeter or so when yellow change falls off, cause bud does not have the consequence of flower less boll.
5. Spray zinc to create high quality
Spraying zinc fertilizer is conducive to the synthesis of chlorophyll, which can promote the absorption of nutrients in cotton, coordinate the operation of nutrients, and enhance the photosynthetic effect. Spraying zinc fertilizer at the flowering and boll stage of cotton can increase the outer boll, prolong the life of leaves, increase the percentage of clothing, and improve the quality.