Standards

DB21/T 4420-2026 Active

DB21/T 4420-2026 Employment and Unemployment Registration Service Specification

Publish Date: 2026-05-07

DB21/T 4421-2026 Active

DB21/T 4421-2026 Evaluation Procedures for Natural Recovery of Abandoned Mines

Publish Date: 2026-05-07

DB21/T 4422-2026 Active

DB21/T 4422-2026 Protocol for surveying carbon stocks of seagrass beds

Publish Date: 2026-05-07

DB21/T 4423-2026 Active

DB21/T 4423-2026 Technical Specification for Close-to-Zero Energy Buildings

Publish Date: 2026-05-07

DB21/T 4424-2026 Active

DB21/T 4424-2026

Publish Date: 2026-05-07

DB21/T 4425-2026 Active

DB21/T 4425-2026

Publish Date: 2026-05-07

DB21/T 4426-2026 Active

DB21/T 4426-2026 Rice carbon sequestration and emission reduction production technical specifications

Publish Date: 2026-05-07

DB21/T 4427-2026 Active

DB21/T 4427-2026 Corn-soybean intercropping and rotation prevention cultivation technical specification

Publish Date: 2026-05-07

DB21/T 4428-2026 Active

DB21/T 4428-2026 The standard of care for dairy cows during the periparturient period

Publish Date: 2026-05-07

DB21/T 3722.8-2026 Active

DB21/T 3722.8-2026 Guidelines for High Standard Farmland Development Part 8: Soil Improvement Engineering

Publish Date: 2026-05-07

DB21/T 3722.9-2026 Active

DB21/T 3722.9-2026 Guidelines for High Standard Farmland Construction Part 9: Engineering for Eliminating Obstacle Soil Layer

Publish Date: 2026-05-07

DB21/T 3722.10-2026 Active

DB21/T 3722.10-2026 Guidelines for High Standard Farmland Construction Part 10: Soil Fertility Enhancement Engineering

Publish Date: 2026-05-07