T/NAASS 133-2025 Technical regulations for establishment and utilization of grazing mixed grassland

Scope

This document specifies the terminology and definitions, planting techniques, field management, and grazing utilization of grazing mixed grasslands. This document is applicable to drylands in Ningxia with an annual rainfall of ≥400 mm and a slope of ≤15°. 3 Terminology and Definitions 3.1 Grazing Artificial Pasture An artificial pasture mixed with two or more legume and gramineous grass species for grazing by herbivores. 4 Planting Techniques 4.1 Seed Selection Select legume and gramineous grass species that are drought-resistant, trampling-resistant, and capable of safely overwintering. For legume grasses, choose Medicago sativa with lateral roots; for gramineous grasses, choose Festuca arundinacea, Bromus inermis, or Dactylis glomerata. 4.2 Seed Treatment For gramineous grass seeds, spread them 5–6 cm thick and air-dry for 4–6 days before planting, turning them over 3–4 times daily. For legume grasses, use coated seeds inoculated with rhizobia. Seed quality must meet the requirements of GB/T 6141, GB/T 6142, and GB/T 2930.6. 4.3 Site Selection Select drylands with an annual rainfall of ≥400 mm and a slope of ≤15°. 4.4 Tillage Deeply till the soil to 18–22 cm in the previous autumn, and apply 10 kg of heavy superphosphate (P2O5 46%), 15 kg of urea (N 46.4%), 6 kg of potassium sulfate (K2O 50%), and 1 kg of 3% phoxim granules per 667 m2. Level the soil before freezing and rake it smooth. Use a rotary tiller to remove weeds before planting and compact the soil after sowing. 4.5 Sowing Sow using a precision seed drill at a depth of 0–20 cm when the soil moisture content in the top layer is ≥12% or after a rainfall of ≥10 mm. Sow legume seeds first and then gramineous seeds using a cross-seeding method, or sow both legume and gramineous seeds simultaneously using a row-seeding machine at a depth of 2–3 cm, followed by compacting the soil. Sow 250 g of alfalfa and 3000 g of a mixed ratio of Festuca arundinacea, Bromus inermis, and Dactylis

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