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Long-term effects of potassium fertilization and straw return on soil potassium levels and crop yields in north-central China

✍ Scribed by Zhao, Shicheng; He, Ping; Qiu, Shaojun; Jia, Liangliang; Liu, Mengchao; Jin, Jiyun; Johnston, Adrian M.

No coin nor oath required. For personal study only.

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