XDA28070101-002 Technical Data Set of Straw Deep Mixing Black Soil Layer Expansion and Storage

To address critical issues in the northern Songnen Plain following black soil cultivation, such as sharp decline in organic matter, soil structure deterioration, and biological function degradation due to intensive use and imbalance between utilization and conservation, as well as shallow tillage layers and thickened plow pan caused by irrational farming practices, a 3,000-mu core demonstration area was established in Qianjin Town, Hailun City, Heilongjiang Province in 2021.

This area focused on demonstrating the technology of deep straw incorporation for black soil layer expansion and nutrient storage enhancement. By 2023, the core demonstration area had expanded to 6,000 mu. Demonstration results showed that deep straw incorporation improved soil fertility in the 0-35 cm layer, increased tillage layer thickness, and enhanced soil nutrient storage capacity.