T/NAASS 137-2025 Code of practice for east-west ridge cultivation of watermelon and melon in greenhouses

Scope

This document specifies the technical requirements for the cultivation of western melons in daylight greenhouses with east-west ridges, including greenhouse design, seedling requirements, farming and cultivation management, and pest and disease control. This document is applicable to the production of western melons in daylight greenhouses in the Yonghe Irrigation Area of Ningxia. 3 Terms and Definitions The following terms and definitions apply to this document. 3.1 Suitable for mechanized cultivation In daylight greenhouse production, a cultivation model using east-west direction, narrow ridges, and wide ditches for ridge cultivation is adopted. 4 Daylight Greenhouse Requirements 4.1 Structural Parameters The length of the daylight greenhouse shall be ≥80 m, with a net span of ≥9 m and a ridge height of ≥4 m. The high-span ratio shall be 12–12.2 and the height from the front base angle to the top of the ridge shall be ≥1.5 m. There shall be no pillars in the greenhouse, and the gable wall shall be equipped with mechanical channels with a height of ≥2.5 m and a width of ≥2.2 m. 4.2 Other Requirements A plastic greenhouse film with high light transmittance, good drip resistance, and strong anti-fogging performance, with a thickness of 0.1–0.12 mm, shall be selected. Ventilation, curtain rolling, and integrated water and fertilizer application facilities shall be available. 5 Seedling Requirements West melon grafted seedlings with strong disease resistance and adaptability shall be selected. The grafted seedlings shall comply with the requirements of DB64/T 1781. 5.1 Variety Selection Tolerant to low temperatures, weak light, disease resistance, high yield, high quality, and nationally registered small-fruit type watermelon and melon varieties. The seed quality shall comply with the requirements of GB 16715.3. 5.2 Seedling Cultivation The cultivation of watermelon and melon seedlings shall refer to DB64/T 1781. 5.3 Indicator of

Development Information

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