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Liquid Fertilizer, LvWang Compound fertilizer,liquid fertilizer,water soluble fertilizers,plant fertilizer,npk water soluble fertilizer,npk 20-20-20 Prevent heavy metal pollutionPotassium humate from mineral sources participates in ion exchange reactions in soil, adsorbing and fixing heavy metal ions in the soil to prevent them from entering the biological cycle.6、 Improve fertilizer efficiency1. Nitrogen fixation: When nitrogen is applied to