Soil Compaction and Maize Root Distribution under Subsoiling Tillage in a Wheat–Maize Double Cropping System

Huang-Huai-Hai Plain is the most important region for grain production in China. In this area, long-term rotary tillage winter wheat and no summer maize have significantly increased soil bulk density, which impede root growth reduce yield. Subsoiling an effective practice to improve properties crop growth. The objective of study was investigate integrated effects subsoiling both seasons on spatial distribution. A two-year field experiment conducted wheat–summer rotation system. Tillage treatments included (RT) (ST) season, (NT), inter–row (STIR), on–row (STOR) season. It found that second year, i.e., 2018, ST decreased density by 3.87% porosity 5.86% at 30–40 cm depth maturity. Meanwhile, length 40–50 30.00% yield 4.70% under ST. season treatments, STOR 4.52% 6.96% 20–30 depth. Compared with NT, 78.45%, a horizontal area 0–10 years, significant increase 58.89% 2018. Therefore, demonstrated Plain, has tidal type, can loosen vertical extension system soil.