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The objective of this study was to evaluate plant-available N pools and the role of N management index (NMI) in the surface (0–20 cm) of a fluvo-aquic soil after 18 years of fertilization treatments under a wheat–maize cropping system in the North China Plain. The experiment included seven treatments: (1) NPK, balanced application of chemical fertilizer NPK; (2) OM, application of organic manure;...
As an essential indicator of soil quality, soil organic carbon (SOC) and its different labile fractions have an important role in determining soil chemical, physical, and biological properties. The objective of this study was to evaluate the soil carbon (C) and nitrogen (N) contents in different soil organic matter (SOM) pools (light and heavy fractions), the role of light- and heavy-fraction C in...
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