T/NAASS 145-2025 Code of practice for cultivation to overcome the continuous cropping obstacles of arched greenhouse watermelons

Scope

This document specifies the technical content of overcoming the obstacles of continuous cropping of greenhouse watermelons, including variety selection, rational crop rotation, grafting cultivation, soil disinfection, microbial preparation treatment, and fertilizer and water management. This document is applicable to the production of greenhouse watermelons in Ningxia. 3 Terms and Definitions There are no terms or definitions that need to be defined in this document. 4 Variety Selection Select disease-resistant, high-yielding, and storage-friendly medium-early maturity varieties registered in China. The seed quality shall comply with the requirements of GB 16715.1. 5 Rational Crop Rotation The previous crops should be onions, garlic, cruciferous vegetables, or corn and beans. 6 Grafting Cultivation Select grafted watermelon seedlings with strong disease and stress resistance. The grafted seedlings shall comply with the requirements of DB64/T 1781. 7 Soil Disinfection 7.1 Physical Disinfection During the dormant period (mid-June to mid-July), clean the field, repair the greenhouse film, and mechanically plow the soil to a depth of more than 30 cm. Water the soil until the moisture content reaches more than 85%. Cover the soil with plastic film and seal the greenhouse film for 15 days. After the end of the disinfection, remove the greenhouse and plastic films, ventilate for 3 to 5 days, and wait until the surface soil moisture content is less than 70% before planting the next crop. 7.2 Chemical Disinfection In combination with high-temperature disinfection, use 50% calcium cyanamide (calcium nitrogen) granules at a dosage of 80 to 100 kg/667 m2, and apply it immediately after spreading; or use 98% cotton pellets in accordance with the requirements of NY/T 3129. 8 Microbial Preparation Treatment Before planting, apply Bacillus subtilis and Bacillus gelatinosus to the soil and root dipping or root irrigation with Trichoderma harzia

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