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Huang-Huai-Hai (HHH) plains of China account for 69.2 % of annual wheat (Triticum aestivum) and 35.3 % of annual maize (Zea mays) production in China, and are China’s principal crop production area. Thus, the understanding of crop yield response to increase in soil organic carbon (SOC) stock in different fertilizer managements, soil types, and the threshold of SOC stock in the HHH region is the key...
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