Figure 4 | Scientific Reports

Figure 4

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

Figure 4

Effect of long-term application of chemical fertilizer, organic manure and straw on the distribution of organic-P and inorganic-P contents. * indicates significant difference at P < 0.05 level at the same soil depth, ns indicates no significant difference regarding the total inorganic and organic P concentrations at the same soil depth. CK, no fertilizer application; NPK, chemical fertilizer application; NPK + S, chemical fertilizer plus maize straw incorporation; OM, organic manure application.

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