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Activities of soil oxidative enzymes across WICST cropping systems. (A) PPO activity and (B) PER activity of 0- to 15- and 15- to 30-cm soil at the WICST after 29 y of different management systems of Maize, MS, MSW, MAAA, and MOA rotation and well-managed Pasture. Box boundaries indicate the 25th and 75th percentiles. Black lines indicate medians, and pink lines indicate means.
