Special fertilizer for regulating and controlling drop irrigation cotton nitrogen-controlled phosphorus-promoting root region as well as application method thereof

The invention discloses fertilizer special for regulating and controlling a drop irrigation cotton nitrogen-controlled phosphorus-promoting root region. The fertilizer comprises special fertilizer forgerminating water, special fertilizer for a bud period, special fertilizer for a flowering period and special fertilizer for a maturation period. According to the solubility of different nutrients and the moving characteristics of different nutrient in soil, the conventional water-soluble fertilizer, in which nitrogen, phosphorus and potassium are mixed as a whole, is changed into easily fixed group fertilizer and an easily migrated group, and a mode of entering an irrigation and fertilization system at different time is adopted, so that nitrogen, phosphorus and potassium are distributed at the periphery of a cotton root system reasonably, fixation of phosphorus fertilizer as well as gaseous loss and leaching loss of nitrogen fertilizer are reduced as compared with those of the conventional water-soluble fertiliz