T/NAASS 086-2024 Ningxia irrigation area popcorn high-yield and high-quality cultivation technical specification

Scope

Scope: This standard specifies the technical requirements for the main links of high-quality and high-yield cultivation of popcorn in irrigation areas of Ningxia Hui Autonomous Region. This standard applies to the high-quality and high-yield cultivation of popcorn in irrigation areas of Ningxia Hui Autonomous Region with an effective temperature sum of ≥10℃ and 2600℃, and a frost-free period of ≥130 days. Main technical content: 3. Terms and definitions The following terms and definitions apply to this document. 3.1 Popcorn Popcorn is a special type of corn with small kernels, all of which are covered with a horny layer and are translucent. When heated, they can expand and burst, producing relatively large popcorn flowers. 3.2 Popping rate The percentage of popping kernels in the total number of test kernels. 3.3 Popping volume The ratio of the volume of popcorn kernels after expansion and bursting to their original volume. 4. Cultivation techniques 4.1 Site selection Select fields with gentle slopes, deep soil layers, medium to high fertility, and light salinization. 4.2 Tillage Deeply plow and sun-dry the field after harvesting the previous crop in autumn, with a plowing depth of ≥30cm. In early spring, rake and harrow the soil in time, and lightly harrow it 3-5 days before sowing, with a harrowing depth of 5-6cm. 4.3 Variety selection Select varieties approved for the Ningxia irrigation area, with a popping rate of not less than 95% and a popping volume of not less than 30 times. The seed quality should meet the requirements of GB 4404.1. 4.4 Sowing 4.4.1 Sowing period Start sowing when the temperature of the top 5-10cm of soil is stable at ≥10℃. The suitable sowing period is generally in mid-to-late April. 4.4.2 Planting pattern Adopt wide-narrow row planting, with a wide row of 70cm and a narrow row of 40cm; or equal-row planting, with an average row spacing of 55-60cm, and a sowing depth of 3-5cm. 4.4.3 Planting densit

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