Straw Mulching with Minimum Tillage Is the Best Method Suitable for Straw Application under Mechanical Grain Harvesting

Figure 1

Soil samples and collection. maize plant. locations of top-dressing application. soil profile collection region (120 × 60 × 60 cm). sampling points for soil penetration resistance and water content test. maize root sampling area (45 × 30 × 60 cm), including three sub-blocks at the plant, left to the plant, and right to the plant. Tests on soil and root samples were carried out at 0−10, 10−20, 20−30, 30−40, 40−50, and 50−60 cm in depth. The capital R stands for maize root sampling area and the S stands for soil sampling points.