Fertilizing method and fertilizer for improving crop yield in saline alkali soil

The invention discloses a fertilizing method and fertilizer for improving crop yield in saline-alkali soil, and relates to the technical field of high-tower fertilizers, the method comprises the following steps: a, applying a base fertilizer before cultivation, the base fertilizer being a high-tower fertilizer; b, applying phosphorus-containing mixed acid with the concentration of 20-40%, and sequentially carrying out rotary tillage, watering and sowing; c, topdressing is carried out after sowing, the topdressing is an organic silicon organic-inorganic mixed fertilizer, the mixed acid is formed by compounding hypophosphorous acid and phosphorous acid, the mixed acid comprises 25-40% of hypophosphorous acid and 60-75% of phosphorous acid, and the high tower fertilizer is prepared from the following raw materials in parts by weight: 15-18 parts of ammonium nitrate, 5-10 parts of ammonium phosphate, 25-30 parts of potassium sulfate, 15-25 parts of active silicon and 15-30 parts of organic matter. The fertilizer