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Effect of Different Fertilizer Application on the Soil Fertility of Paddy Soils in Red Soil Region of Southern China
Figure 1
Average soil pH in the different fertilizer treatments.
CK: no fertilizer; SR: straw returning rice field; NPK: chemical fertilizer; OM: organic manure and GM: green manure.
doi: https://doi.org/10.1371/journal.pone.0044504.g001