T/HNBX 145-2022 Techniques for planting sweet potatoes

Scope

Main Technical Content: 6. Cultivation Techniques 6.1 Film Mulching Seedling Production 6.1.1 Selection of Seedbed Sites: Choose sites with a sheltered south-facing orientation, convenient irrigation and drainage, deep soil layers, and fertile sandy loam soil. 6.1.2 Standardized Seedbed Preparation: - Width: 1.5 m - Height: 15 cm - Level the seedbed surface. 6.1.3 Timely Planting: - Before and around Jingzhe (March 5), plant 75 kg–100 kg of seed potatoes per 667 m2 seedbed. - Soak the seed potatoes in multifunctional fungicide and dry them before planting. - Place the seed potatoes with the cut side facing up, arrange them in an inclined row, and separate them by size. - Fill the gaps with mixed fertilizer soil and water them. - Cover with 8–10 cm of fine soil. - Lay a film on the soil and cover it with a stake to maintain warmth and moisture for germination. 6.1.4 Seedbed Management: - After seedlings emerge, prune them and apply fertilizer (23 g/m2 of N) to the seedbed. Remove weeds. 6.2 Strong Seedling and Early Planting - Plant potatoes from mid-to-late May to early June. - Select seedlings with thick vines, short internodes, well-developed root primordia on nodes, no white roots, even top leaves, thick leaves, and moderate size. - Plant 3,000–3,500 seedlings per 667 m2 in bare fields and 2,000–2,500 seedlings per 667 m2 in intercropping fields. 6.3 Field Management 6.3.1 Seedling Check and Supplementation: - Complete within two weeks after planting. Select strong seedlings, water thoroughly, and fertilize after survival. 6.3.2 Weeding, Hoeing, and Soil Enhancement: - Conduct 2–3 times between planting and ridge closure. 6.3.3 Irrigation and Drainage: - Water 2–3 times after planting to promote root growth and survival. - During "Fuban Drought", irrigate promptly with shallow, frequent watering. - In the late growing season, avoid excessive rainfall to prevent soil flooding and root rot. 6.3.4 Vine Mana

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