Fertilizer use principles for the production of pollution-free citrus fruits must follow the regulations set out in NY/T 496-2002. The nutritional needs of citrus trees should be fully met, with a greater emphasis on organic fertilizers and a more rational application of inorganic fertilizers. Leaf nutrient diagnosis and formula-based fertilization are strongly encouraged. All fertilizers used must be registered or exempt from registration by the agricultural administrative department, and the use of chlorinated fertilizers is strictly limited. For the production of AA-grade green foods, only fertilizers specified in NY/T 394 are permitted, and the use of chemical synthetic fertilizers is completely prohibited. Municipal waste, sludge, hospital waste, garbage, and industrial waste containing harmful substances such as toxic gases, pathogens, or heavy metals must not be used. Green manure should be applied using methods like covering, turning, or piling, and it should be turned under at the flowering stage. Composted biogas, human, and animal waste can be used as topdressing, but unverified human waste is not allowed. Organic cake fertilizer is preferred for fruiting stages, and unripe cake fertilizer is strictly forbidden. Foliar fertilizers must be approved by the Ministry of Agriculture and should not contain chemically synthesized growth regulators. They must also meet the technical requirements outlined in B3 of Appendix B in NY/T 394. Spraying should be done according to the instructions provided. Microbial fertilizers can be used for seed treatment, base fertilizer, or topdressing, and must be applied strictly according to the manufacturer's guidelines. The number of viable bacteria in these products must comply with the standards set in NY/T 227. Inorganic (mineral) fertilizers such as calcined phosphate and potassium sulfate must meet the technical specifications in B1 and B2 of Appendix B, respectively. For A-grade green food production, the types of fertilizers specified in NY/T 394, section 4.2, must be used. If these are insufficient, chemical fertilizers (nitrogen, phosphorus, and potassium) may be used in accordance with sections 5.2.2 and 5.2.3, but nitrate nitrogen fertilizers are prohibited. Fertilizers must always be combined with organic materials, and the ratio of organic to inorganic nitrogen should not exceed 1:1. For example, 1,000 kg of high-quality manure can be paired with 10 kg of urea, which can serve as both base fertilizer and top dressing. Fertilizers can also be combined with organic materials and compound microbial fertilizers. For instance, 1,000 kg of manure, along with 5–10 kg of urea or 20 kg of diammonium phosphate, plus 60 kg of compound microbial fertilizer, can be used. Base fertilizer and top dressing should be applied accordingly, with the last top dressing completed at least 30 days before harvest. Municipal solid waste must be detoxified and meet the quality standards outlined in GB8172 before use. The annual application rate should not exceed 3,000 kg per 667 square meters for clay soils and 2,000 kg for sandy soils. Returning straw to the field is encouraged, and the carbon-nitrogen ratio can be adjusted with a small amount of nitrogen fertilizer if needed. Other guidelines for fertilizer use should follow the same rules as outlined in sections 5.1.4 to 5.1.9. Farmyard fertilizers used in the production of pollution-free foods and green foods must be composted at high temperatures to eliminate parasites, pathogens, and weed seeds. Regardless of the raw materials—such as manure, poultry droppings, straw, weeds, or peat—the composting process must ensure they meet health safety standards. Local production is preferred, and imported farmyard fertilizers should only be used after confirming they meet all necessary requirements. Commercial and new fertilizers must pass national registration and certification, and their production permits and quality indicators must comply with relevant national standards. If fertilizer use leads to water pollution or affects crop growth and product safety, the use of such fertilizers must be immediately stopped, and the issue reported to the relevant authorities. Any food produced with such fertilizers cannot continue to carry the green food label.

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