Studies have shown that potassium is one of the indispensable nutrients for tomato growth. Under the premise of sufficient nitrogen and phosphorus, reasonable application of potash fertilizer not only can significantly increase tomato yield and comprehensive resistance, but also improve the quality of tomatoes and avoid tendons. Occurrence of rot. At present, there are three types of potash fertilizers on the market: potassium chloride, potassium sulfate, and potassium dihydrogen phosphate. With the application of potassium chloride, the tomato fruit grows slowly and has an adverse effect on quality. Therefore, potassium chloride is generally not used on tomatoes. Potassium sulphate is a physiological acid fertilizer that can be used as base fertilizer and topdressing fertilizer. As a base fertilizer, deep soil application method should be adopted, because the change of dry humidity in deep soil can reduce the fixation of potassium and increase the utilization rate of potassium. When topdressing, it can be applied once in heavy soil. In soil with poor water retention and fertilizer retention, it should be applied in stages to avoid causing loss of potassium. The long-term use of potassium sulfate can cause soil compaction, and for this reason, decomposed organic fertilizer should be added. Potassium dihydrogen phosphate is mainly used for foliar dressing. The concentration is generally 0.2% to 1%. When preparing the fertilizer solution, the fertilizer must be fully dissolved and mixed before use. The best results are used in the morning or evening. The foliar dressing is the best. Afterwards, if there is rain, it should be sprayed in time.
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