Figure 1 | Scientific Reports

Figure 1

From: Impacts of Long-term Fertilization on the Molecular Structure of Humic Acid and Organic Carbon Content in Soil Aggregates in Black Soil

Figure 1

Effects of different fertilization treatments on carbon contents in HA and bulk soil. CK, no fertilizer treatment; NPK, chemical NPK fertilizers; M, organic manure treatment; MNPK, treatment of organic manure combined with chemical NPK fertilizers. Different lowercase letters for each parameter indicate significant difference among different treatments at P < 0.05.

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