Figure 3 | Scientific Reports

Figure 3

From: Long-term application of fertilizer and manures affect P fractions in Mollisol

Figure 3

Effect of long-term fertilization on phosphorous activation constant in Mollisol profiles. Different letters in the bars of same depth indicates significant difference at P < 0.05 level among different treatments. CK, no fertilizer application; NPK, chemical fertilizer application; NPK + S, chemical fertilizer plus maize straw incorporation; OM, organic manure application.

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