Normal growth and development of cotton require nitrogen, phosphorus, potassium, iron, zinc, copper, manganese and other elements. Studies have shown that about 100 kilograms of lint cotton need to absorb about 13.35 kilograms of pure nitrogen, 4.65 kilograms of phosphorus pentoxide and 13.35 kilograms of potassium oxide per 100 kilograms of lint. The amount of fertilizer needed increases with the increase in production level. Different varieties and yield levels are slightly different. In the seedling stage, cotton absorbs 5% of nitrogen, 3% of available phosphorus, and 3% of effective potassium. From budding stage to early flowering stage, it absorbs 11% of nitrogen, 7% of available phosphorus, and 9% of effective potassium; it absorbs from the early flowering stage to the flowering stage. 56% of nitrogen, 24% of available phosphorus, 36% of available potassium; 23% of nitrogen absorption, 52% of available phosphorus, and 42% of available potassium from flowering stage to the beginning stage; 5% of available nitrogen, 14% of available phosphorus, effective after boll opening Potassium 10%. It can be seen that during the flowering and bolling period, the peak period of nitrogen uptake by cotton is at the full flowering stage, and the peak period of phosphorus and potassium absorption is from flowering stage to boll opening stage. Zinc, boron, manganese and other elements are targeted for use due to lack of supply and demand according to soil nutrient supply. Cotton requires high fertility in cotton fields. Therefore, it is necessary to apply topdressing fertilizer in appropriate amounts at the right time. It is generally necessary to grasp the principle of light weight before and after, because of the land, due to time, due to the use of seedlings. First, base fertilizer To apply basal fertilizers, organic fertilizers should be used as the main fertilizer. Generally, about 2000 kg of farmyard manure should be applied to Mushi, and 30% to 50% of the total nitrogen fertilizer, all phosphate fertilizers, and 50% to 100% of potash fertilizer should be applied. Summer cotton without basal conditions can be recovered early in the seedling stage. The response of cotton to zinc and boron is sensitive, but the soil supply in most of the cotton fields in our province is relatively insufficient. It is recommended that zinc fertilizer (1 to 2 kg) and 0.5 kg of boron fertilizer be applied per mu. Cotton formula fertilizer also contains nutrients such as nitrogen, phosphorus, potassium, zinc, boron, etc. It is better to select suitable cotton fertilizer formula according to the characteristics of soil nutrients and management level, generally 40-50 kg per mu. Second, top dressing Topdressing is dominated by nitrogen fertilizer, which is generally divided into two stages, the early flowering stage and the booming stage. The ratio of two fertilization is 1:2. If the seedlings at the beginning of the flowering period are growing better, the first top dressing may be omitted. Those accustomed to one-time top-dressing can be carried out in the early flowering period (with 1 or 2 young bells per plant). Phosphate fertilizer is mainly used as base fertilizer, which can meet the needs of the whole growth period of cotton, so cotton is generally no longer topdressing phosphate fertilizer. Need to topdressing potash fertilizer, can cooperate with nitrogen fertilizer, topdressing during the Shengling period. Third, make top cover fertilizer The top cover fertilizer is mainly used to prevent late-stage fertilizer loss due to lack of fertilizer in late-stage cotton, so as to strive for multi-junction peaches and increase boll weight. At this point to make up fertilizer material because of the inconvenience of land, generally outside the top dressing, spray foliar fertilizer. Spray Tianda 2116 cotton special-purpose foliar fertilizer 600 times, spray once every 10 to 15 days, spray 3 to 4 times. FFP3,High Quality FFP3,FFP3 Details, CN Dongguan Maimeng Culture and Creative Co. Ltd , https://www.factorydirectmask.com