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Normal growth and development of cotton through the seedling stage, bud stage, flowering stage, boll opening stage and other stages, generally every 100 kg of 667 m lint cotton need to absorb 7-8 kilograms of nitrogen, phosphorus 4-6 kilograms, potassium 7-15 kilograms; 200 kg of linseed cotton of 667 m 2 need to absorb 20 to 35 kg of nitrogen, 7 to 12 kg of phosphorus, and 25 to 35 kg of potassium.
The amount of nutrients absorbed at different growth stages of cotton is different. In general, the seedling stage is a period of vegetative growth based on long roots, stems, and leaves. The plants are small, have less growth, and require less nutrients. During budding period, nutrition and reproductive growth are carried out at the same time. It is a time when cotton grows vigorously. During this period, the growth rate of cotton is fast and the demand for nutrients increases; the vegetative growth in flowering and budding period reaches the highest peak, and then turns to the period in which reproductive growth dominates. The uptake of nutrients reached the peak and absorbed the most; after the boll opening period, the growth of cotton was significantly weakened, the root absorption capacity decreased, and the absorption of nutrients was significantly reduced.
According to a study by the Cotton Research Institute of the Chinese Academy of Agricultural Sciences on cotton 12 studies, the absorption of nitrogen (N), phosphorus (P2O5) and potassium (K2O) by cotton in the seedling stage accounted for 4.5% and 3.0% to 3.4% of the total lifetime absorption. The bud period was 27.8%-30.4%, 25.3%-28.7% and 28.3%-31.6%, respectively; the highest flowering period was 59.8%-62.4%, 64.4%-67.1% and 61.6%- 63.2%; Bolling period was 2.7% to 7.8%, 1.1% to 6.9% and 1.2% to 6.3%, respectively.
It is worth mentioning that although the nutrient elements need less during the seedling stage, its role is large. In this case, lack of nutrients will cause the growth of seedlings to be frustrated, even if a large amount of fertilization is difficult to remedy. Therefore, the demand for nutrient elements in the seedling stage of cotton should be met, especially the demand for phosphorus. Emphasizing early application of phosphate fertilizer and applying nitrogen fertilizer as base fertilizer and seed fertilizer.
Needed fertilizer characteristics of cotton
The normal growth and development of cotton requires a variety of nutrients, among which nitrogen, phosphorus, and potassium are needed in large quantities. The soil is generally unsatisfactory and needs to be supplemented by fertilization. Although other trace elements such as zinc, manganese, boron and other cotton needs are small, but due to soil and other conditions, the soil sometimes can not meet the requirements of its growth and development, the performance of the lack of application of micro-fertilizer significantly increased production.