Out-of-root topdressing has the advantages of quick effect, fertilizer use, etc., and is widely adopted by farmers. However, not all fertilizers are suitable for foliar application. Fertilizers that cannot be used for foliar spraying include: (1) fertilizers that are insoluble in water, such as calcium magnesium phosphate fertilizers, zinc oxide, manganese slag, etc.; (2) fertilizers with volatile ammonia, such as ammonia, ammonium bicarbonate, and phosphoric acid. Ammonium; (3) Fertilizers containing toxic substances, such as lime nitrogen, phosphorus-containing fertilizers such as trichloroacetaldehyde. In addition, chlorine-sensitive crops should not use chlorinated fertilizers for extra-root fertilizers to avoid chlorine hazards.
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