T/NAASS 085-2024 The precise regulation and high-yield technology procedures for maize planting with dense spacing in Ningxia irrigation area

Scope

Scope: This document specifies the terminology and definitions, variety selection, land preparation, sowing, drip irrigation, fertilization, and chemical control of the main technical procedures for high-yield production of corn in Ningxia irrigation areas. This document is applicable to the entire process of corn production in Ningxia irrigation areas. Main technical content: 3. Terminology and definitions: - Dense planting: On the basis of the conventional corn planting density, an additional 1,000 to 1,500 seedlings per 666.7 m2 are planted, reaching 6,500 to 7,000 seedlings per 666.7 m2. - Accurate regulation: Through precision sowing, drip irrigation and fertilization control, and chemical control technologies, a high-yield dense plant population is established, and water and fertilizer are precisely supplied throughout the entire growth period to prevent lodging and senescence. 4. Variety selection: - Select varieties that have been approved for cultivation in Ningxia irrigation areas and are resistant to dense planting, lodging, pests and diseases, have rapid grain dehydration, and are suitable for mechanized harvesting. 5. Land preparation: - Select plots with flat terrain, fertile soil, good permeability, and complete drip irrigation facilities. - After the previous crop is harvested, deep plowing and weed removal are carried out, and 200 to 300 kg/666.7 m2 of organic fertilizer or 1,000 to 2,000 kg/666.7 m2 of farmyard manure is applied. - Before sowing, timely harrowing and weeding should be carried out to close off weeds. 6. Navigation sowing: - Sowing can be carried out when the ground temperature stabilizes at 10 to 12 °C for 5 cm. The suitable sowing period is mid-to-late April. - A single-seed precision sowing machine equipped with a navigation system is used to complete sowing, fertilization, and drip irrigation in one operation. - Per 666.7 m2, 2 to 3 kg of N2, 4 to 6 kg of P2O5, 3 to 5 kg of K2O, and 1 kg of zinc sulfate are applied as sowing

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