Fig. 4
From: Organic phosphorus leaching risk from agricultural soils across China
Correlation between (a) CaCl2-extractable organic P with available organic P under total soils, (b) CaCl2-extractable organic P with available organic P under paddy soils, (c) CaCl2-extractable organic P with available organic P under red soils, (d) CaCl2-extractable organic P with available organic P under chernozem, (d) CaCl2-extractable organic P with available organic P other soils