Insect-resistant cotton has effectively controlled the damage of bollworm, the number of shedding of bolls has been greatly reduced, her reproductive growth has been vigorous, her bells have been early and many, and the peak of fertility is required to be fast and fierce. If traditional methods of fertilization are used, they often cannot meet their needs, resulting in poor vegetative growth and premature aging. In addition, insect-resistant cotton has been introduced into the insect-resistant gene, its resistance to disease has been reduced, and diseases such as red-leaf stem blight have been apt to occur, and potassium has enhanced cotton resistance and disease-preventing effects. If nitrogen and phosphorus fertilizers are applied blindly, ignoring the application of organic fertilizers and potash fertilizers will not only increase the cost of fertilizer application, but also tend to cause cotton not to be premature or late, which will have a great impact on yield and quality. Therefore, we must increase organic fertilizers, potash fertilizers, and reduce nitrogen and phosphate fertilizers. Apply about 3,000 kg of organic fertilizer per acre and 10-15 kg of potash fertilizer. The traditional application of urea per acre 25 to 30 kilograms, superphosphate 50 kilograms, reduced to 12 kilograms per acre urea, superphosphate 25 kilograms. Combine the above fertilizer with deep soil preparation and less than 15 cm. The change of flower and boll fertilizer was applied twice in a concentrated manner. The flowering and boll season was the period when the growth and development of cotton was the most vigorous and the fertilizer was the most needed. Generally need to apply 25 ~ 30 kg of urea per mu, potassium fertilizer 10 kg. For the characteristics of fast and concentrated flowering and bolling of insect-resistant cotton, 2/3 of flower and bell-fertilizer can be applied in the early flowering period, and the remaining 1/3 can be applied again after 15 days or so. This can satisfy the constant flowering and ringing of cotton. Need, but also effectively prevent the cotton plant's leggy and premature aging. The top-dressing soil is topped with foliar topdressing: At the later stage of cotton growth, the absorption capacity of the root system is reduced. If the nutrient is insufficient, premature aging can be easily caused and the top dressing needs to be applied. The foliar top dressing top dressing has the advantages of convenience, quick effect, good effect, and saving fertilizer, and can save 2/3 of the fertilizer than the soil dressing. Rhodium powder Rh≥99.95% Properties: silver-white metal, extremely hard, wear-resistant, also has considerable ductility Application: It can be used as raw material for electrical instrumentation, chemical industry and manufacture of precision alloys. Rhodium powder is based on the widespread use of ruthenium in the industrial industry. Since rhodium is a rare metal required by the industry, the industry price is slightly higher than that of general non-ferrous metals. Rhodium, one of the rare elements, has various uses. Rhodium can be used to make hydrogenation catalysts, thermocouples, platinum-rhodium alloys, etc. It is also often plated on searchlights and reflectors, and is also used as a polishing agent for gemstones. and electrical contact parts. precious metal XI AN RHINE BIOLOGICAL TECHNOLOGY CO.,LTD , https://www.rhinebiotech.com