Cotton medium-trace water-soluble fertilizer containing cotton vinegar and preparation method and application method thereof

The invention discloses cotton medium-trace water-soluble fertilizer containing cotton vinegar. According to the water-soluble fertilizer, the cotton vinegar is taken as a substrate, and amino acid, potassium dihydrogen phosphate, zinc phosphate, borax, calcium nitrate, manganous sulfate monohydrate, magnesium sulfate and ammonium molybdate are added to the cotton vinegar. Compared with the priorart, the water-soluble fertilizer not only is suitable for being sprayed on the leaf surface of the cotton but also can be used as fertilizer special for drip irrigation on the cotton in cooperation with macroelement water-soluble fertilizer, the water-soluble fertilizer can regulate and control the root nutrient distribution and root system architecture, the medium-trace drip irrigation requirements of the cotton at different growth and development stages can be met, and the effects are achieved that medium and trace elements are supplemented to balance crop nutrients, the fertilizer efficiency is improved, the growt