T/NAASS 083-2024 Full-film double ridges and furrows sowing + Under-film drip irrigation high-density cultivation technique for maize in rainfed areas

Scope

Scope: This document specifies the technical norms for high-yield cultivation of corn in arid and rain-fed areas, including terms and definitions, variety selection, land preparation, film covering, sowing, field management, and pest and disease control for the "Full Film Double Ridge Furrow Sowing + Subsurface Drip Irrigation" intensive planting technology. This document applies to corn production in arid and semi-arid regions with an effective temperature above 10°C and ≥2500°C, and annual rainfall below 500mm, where supplementary irrigation is available. Main technical content: 1. Terms and definitions: Full Film Double Ridge Furrow Sowing and Subsurface Drip Irrigation. This involves laying drip irrigation tapes under the film (see Figure 1). The water needed for crop growth is primarily collected by the double ridge furrow, and during critical water-stress periods, "rescue water" from under the film is used to meet the crop's water requirements, thereby achieving stable and high yields. 2. Variety selection: Select certified, mid-to-early maturing, high-density-tolerant, fast-drying grain, and strong lodging-resistant corn varieties suitable for arid and rain-fed areas. 3. Mechanical land preparation and film covering: Select plots with flat terrain, deep soil layers, loose soil texture, moderate to high fertility, and strong water and fertilizer retention capabilities. In mid-to-late March, remove surface residual film, mechanically till and destroy stubble before sowing. Apply fertilizer throughout the growing season: 20-25 kg N/666.7 m2, 8-10 kg P2O5/666.7 m2, and 6-8 kg K2O/666.7 m2. Combined with base fertilizer (10-12 kg N/666.7 m2, 5-7 kg P2O5/666.7 m2, and 6-8 kg K2O/666.7 m2), and 1 kg zinc sulfate. If using slow-release fertilizer, apply all fertilizer at once (slow-release fertilizer: ordinary nitrogen fertilizer = 2:1), 45-55 kg/666.7 m2, with a fertilizer application depth of 15-20 cm. The slow-release fertilizer standards comply with GB/T 2334

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