First, technical characteristics. Matrix culture seedling management simplifies the process, reduces labor intensity, and lowers labor costs. The use of a substrate for seedling growth, combined with a rooting agent for bed preparation and root soaking before transplanting, ensures a high seedling survival rate and better root development. Vegetable sheds or greenhouses can be used, allowing flexible location choices and easier management. Multiple farmers can collaborate in growing seedlings, or multiple greenhouses can be scaled up for larger production. The matrix, rooting agent, and leaf protection agent are all national invention patents developed by the Cotton Research Institute of the Chinese Academy of Agricultural Sciences. Second, seedling and technical standards. Strong seedlings should have an early sowing age of 25–30 days and a late sowing age of 20–25 days, with 2–3 true leaves. Seedling height should be between 15–20 cm, with at least 50% red stems before transplanting. Cotyledons must remain intact, leaves free from disease, dark green, and stems thick with dense roots and strong root systems. Technical standards include a uniform mix of clean river sand (volume ratio 1:1.2, weight ratio 1:10), a 10 cm layer of seedling substrate covered with plastic film, and sowing spacing of 10 cm, with grain spacing of 1.4–1.8 cm and a planting depth of 3 cm. The moisture content of the seedbed substrate during sowing should be around 30%. Third, technical regulations. 1. Preparation before sowing. (1) Ensure sufficient seeds. Select locally recommended varieties with quality meeting or exceeding GB 15671-1995 standards. Prepare 10% extra seedlings based on the planned transplanting density. (2) Provide necessary supplies such as substrates, root-enhancing agents, leaf protection agents, and clean river sand. These materials can be found in small arch shelter seedling techniques. (4) Prepare nursery boxes and racks for layered seedling cultivation in greenhouses or solar greenhouses. 2. Seedbed construction. (1) Choose a suitable location—leeward, sunny, high ground, with good drainage, easy access, and convenient transportation. (2) Determine the seedbed area based on transplanting density (500 seedlings per square meter). (3) Build the seedbed. After mid-March, clear and disinfect the area, raise the bed above ground level, cover with mulch, and surround it with a 10–12 cm high wall. A 10 cm thick base of film is laid. Each cubic meter of seedling substrate is placed on a 14m wide, 0.7m wide, and 0.1m deep bed. For multi-layered seedling cultivation, set up layers according to shed height—first layer 90 cm, second 80 cm, third 70 cm. Nursery boxes are 12 cm high, 80–100 cm long, 40–50 cm wide, with a 10 cm matrix thickness. A 3-layer design allows 1500 seedlings per square meter. 3. Seedbed sowing. (1) Sow at the right time. Seedling period is 20–30 days, with 2–3 true leaves. Transplanting occurs from late April to early May, with sowing usually taking place from late March to early April. Use batch sowing, sowing 1–2 beds at a time, then waiting 1–2 days before sowing others to ensure proper seedling age. (2) Water the substrate properly. Fill the bottom of the bed until the matrix is moist but not waterlogged, with moisture content between 29–33%. Approximately 38–40 liters of water per square meter is needed (with river sand moisture below 5%). (3) Row seeding and film covering. Use a ruler to mark 10 cm row spacing, dig 3 cm deep furrows, plant one seed per hole, with 1.4–1.8 cm spacing. After sowing, cover the seeds with substrate, press gently, and smooth the bed. Cover the bed with a film, remove it after emergence to prevent heat damage. 4. Seedbed management. (1) Apply rooting agent when cotyledons are flat. Dilute the solution at 1:100 and pour evenly around the roots, avoiding direct spraying. (2) Monitor temperature to avoid overheating. Maintain 25°C until cotyledons are flat, then adjust to 20–25°C when true leaves appear. Ventilate by opening skylights or using fans to keep temperatures below 35°C. (3) Water appropriately—3–4 times during the seedling stage, following the “dry roots†principle. Control watering to promote strong growth and remove weeds regularly. (4) Pest and disease control: manage seedbed pests like thrips, earthworms, whiteflies, aphids, and leaf miners. Early prevention is key to reducing disease risk. 5. Pre-transplanting management. (1) Open the sunroof in large solar greenhouses to allow direct sunlight, promoting red stem development. (2) Stop watering 7–10 days before transplanting to strengthen the seedlings. (3) Spray a leaf protection agent 1:15 dilution the day before transplanting. 6. Seedling control methods. If transplanting is delayed and seedlings have more than three true leaves, take action. First, strictly control watering. Second, perform "pseudo planting"—gently lift the seedlings from the substrate and replant them further apart on the same bed to provide more water and nutrients. Third, spray 1 kg of diluted amine (10 mg) to help regulate growth. This method keeps seedlings under control for about 7–10 days. Finally, comprehensive nursery bases and cycling seedling technology center around matrix-based seedling techniques. This approach supports various crop rotation systems, including vegetables - early spring cotton - late spring cotton, flowers - early spring cotton - late spring cotton - short-season cotton - flowers, anti-seasonal early corn - cotton - late corn, cotton - rice - rapeseed, early spring potato - cotton - anti-season garlic, and flowers - strawberries - traditional Chinese medicine crops. 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