Fig. 7From: Effects of acidic phosphorus-rich biochar from halophyte species on P availability and fractions in alkaline soilsPearson correlation matrix featuring relationships between soil properties and biochar P fractions. AS: aeolian sandy soils a; BS: brown desert soils b; GS: grey desert soils c; SS: saline soils d. Correlation significance was set at *p < 0.05, **p < 0.01Back to article page