Figure 4
From: Eight-year tillage in black soil, effects on soil aggregates, and carbon and nitrogen stock
Correlation of soil aggregate characteristics and the amounts of soil carbon and soil nitrogen in the 0–30 cm layer of the soil under different tillage treatments applied during an 8-year continuous cropping experiment conducted in a black soil area in Northeast China. Zea mays L. ‘Zhengdan 958’ was cultivated for the duration of the experiment (2011 to 2019). CK, stubble cleaning and ridging; WL, width lines; NT, no-tillage with stubble retention; PT, plow tillage. The distribution of water-stable soil aggregates is > 2 mm, 2–0.25 mm, 0.25–0.053 mm, and < 0.053 mm. R0.25, aggregates > 0.25 mm; MWD, mean weight diameter; GMD, geometric mean diameter, ELT, unstable aggregate index; SOC, soil organic carbon; TN, total nitrogen; STCS, soil carbon stock; STNS, soil nitrogen stock. The × indicates that the data are significantly different (P < 0.05).
