T/NAASS 065-2023 Ningxia southern mountainous area ground celery nitrogen and phosphorus leaching prevention and control technical specification for open ground

Scope

Scope: This protocol specifies the relevant terms and definitions, basic principles, environmental conditions of the production site, variety selection and replanting cultivation, source control techniques, process blocking techniques, and harvesting for the prevention and control of nitrogen and phosphorus loss in open-field celery production. This protocol applies to the open-field celery production in the southern mountainous areas of Ningxia; Main technical content: 3. Terms and definitions: The following terms and definitions are applicable to this document. Nitrogen and phosphorus leaching from celery fields refers to the process of nitrogen and phosphorus in the soil leaching out of the celery root zone through irrigation and precipitation. Source control: A technique that determines the total nutrient demand based on the target yield of celery and controls the input of fertilizers to effectively control the loss of nitrogen and phosphorus in the soil from the source. 3.3 Process blocking techniques: A technique that effectively blocks the loss of nitrogen and phosphorus in the soil during the growth of celery through water-saving irrigation, reduced fertilizer application, and the combined application of organic and inorganic fertilizers. 4. Environmental conditions of the production site: The open-field celery cultivation in the southern mountainous areas of Ningxia with a frost-free period of 135 days, an average annual temperature of 5°C to 7°C, and an effective accumulated temperature of more than or equal to 10°C for 2400 days. The environmental conditions of the production site shall comply with the requirements of NY 5010-2002, and the irrigation water quality shall comply with the provisions of GB 5084-2021. 5. Techniques for preventing and controlling nitrogen and phosphorus loss in celery: The second and third fertilization and irrigation are the peak periods of nitrogen and phosphorus loss in celery fields. By controlling irrigation and

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