Cotton application of boron fertilizer varies from seedling to seedling

First, the application of boron is clear. First, after applying boron fertilizer to cotton, it can effectively prevent cotton from being flowery; secondly, it can improve the oxygen supply state of cotton rhizosphere, promote growth and enhance the absorption capacity of fertilizer and water; and promote the smooth transport of carbohydrates produced by leaves. Other organs; four can improve the reproductive organs, promote flower bud differentiation, increase the rate of ringing; five can increase cotton yield, cotton fields with mild boron deficiency can increase yield by more than 5%, and cotton fields with severe boron deficiency can increase yield by about 10%.

Second, identify the symptoms of boron deficiency. First, after the cotton enters the bud stage, a ring-shaped infiltration zone appears on the petiole, and the more the middle and upper part of the new leaf, the more obvious the ring zone. The buds of the buds are easy to open, appear like insects, and the shedding is intensified. Second, the cotton fields with severe boron deficiency, the dark leaves of the old leaves of the cotton leaves are deep green, the old leaves are prominent, the leaves are brittle, the new leaves become smaller, and the leaves are Shrinking, reverse curling; third, the fruit branches are shortened, sometimes the fruit branches and leaf branches are interlaced on the main stem; the fourth is less flowers and small flowers. The opening of the flower mouth is poor, the pollen viability is reduced, and the bud is not flowered or flowered; the fifth is that the young bell is small, the peach is less, the bell is light, and the bell is hook-shaped. Of course, the symptoms of boron deficiency in various cotton fields are different.

Third, carefully choose boron fertilizer. The boron fertilizer currently sold on the market is mainly borax. According to the sampling of the quality inspection authorities, most of them do not meet the standard, and the pure boron content is only about 6%. Even the content of pure boron that meets the standard is only 10.9%. The high content of Suo Le Boron has a pure boron content of 20.5 to 21.6%. The boron content of the boron is up to 15%. Therefore, the production of boron and selebrex boron should be preferred. As for borax, boric acid, etc., it is necessary to use authentic standard products.

Fourth, pay attention to the application of boron technology. First, we must understand the status of boron deficiency in the soil, distinguish between severe, moderate or mild boron deficiency or potential boron deficiency, red soil, red soil, strong leaching, and a wide range of boron deficiency. Some soils are fixed in boron and are insoluble. Some soils have high organic matter content, and boron is adsorbed, presenting a potential boron deficiency. Some soils use too much lime to reduce the boron content. In these different categories, it is necessary to apply boron; secondly, in the cotton field with severe boron deficiency, besides applying boron to the base fertilizer, it is necessary to apply boron fertilizer, cotton field with moderate or slight boron deficiency, only need to apply boron fertilizer; To determine the amount of boron applied. Generally, the base fertilizer has a potting power of about 250 grams per acre, and the application amount of severe boron deficiency is doubled. If no boron fertilizer is applied in the bottom fertilizer, the application of bud fertilizer or flower bell fertilizer should be combined with 200-250 grams of boron per mu. Topdressing in the bud stage, flowering stage, and ringing stage spray 0.1~0.2% of the speed of Boron. The boron can be mixed with the compound fertilizer, and the speed boron can be applied alone or mixed with pesticides and urea.