T/QTDGXH 02-2022 Active Group standards

T/QTDGXH 02-2022 Technical Specifications for Bridgehead Sweet Potatoes

T/QTDGXH 02-2022

Publish Date: 2022-10-28 Implement Date: 2022-11-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/QTDGXH 02-2022

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: -

ICS Name: Terminology (principles and coordination and cooperation)

Publish Date: 2022-10-28

Implement Date: 2022-11-01

Scope

Main technical content: 1. Land preparation: Thoroughly plow and harrow the potato field, using two plows and two harrows or one plow and two harrows. The plowing depth should be 25–30 cm, with an interval of 7–10 days between each plowing or harrowing. Sun-dry the soil to ensure it is deep, loose, fine, and level. 2. Ridge formation: After the second harrowing, form ridges with a ridge spacing (including ridge and furrow width) of 90–100 cm and a ridge width of 60–70 cm. The top width should be 40 cm, and the ridge height 30–35 cm. Requirements include uniform ridge spacing, straight ridges, full ridge shapes, smooth ridge surfaces, deep and narrow furrows, and a north-south orientation for the ridges. During ridge formation, the soil should not be too wet or too dry – preferably dry rather than wet. 3. Base fertilization: Apply sufficient organic fertilizer as base fertilizer during land preparation. For each hectare, use 7.5–15 tons of commercial organic fertilizers, biological organic fertilizers, or animal manure (e.g., cow dung, sheep dung). Organic fertilizers should meet the requirements of NY 525 and NY 884, and animal manure should be fully composted before use, following the specifications of NY/T 1334 and GB/T 25246. Before the second harrowing, evenly spread the organic fertilizer on the surface of the soil. For soils with high acidity, apply acidic soil conditioners according to the manufacturer's instructions, adjusting the pH to 5.0–7.0. 4. Planting materials 7.1.1 Seedling selection: Use detoxified seed potatoes (seedlings) with first- and second-grade quality meeting the requirements of NY/T 1200 and NY/T 402. Use cuttings as seedlings. Select seedlings aged 30–35 days with a stem length of over 30 cm, short internodes (3–4 cm, occasionally 5 cm), three evenly spaced leaves at the top, bright green leaves, thick leaves with moderate size, flexible stems that do not easily break, and abundant white sap with thick consistency when broken. C