fig2
![The use of biochar for reducing carbon footprints in land-use systems: prospects and problems](https://image.oaes.cc/e3c07d60-9336-44f0-bce7-df2fe819fa83/5272.fig.2.jpg)
Figure 2. Relationship of P added to a soil and soil-biochar mixtures (1%, 2% and 5% biochar additions) to a soil with greater P retention capacity (Apopka soil from Florida, USA) than the soil in Figure 1: (A) hardwood biochar, HWB; (B) poultry litter biochar, PLB and P remaining in solution after equilibration (Dari et al.[55]). The x-axis has been expanded to show the relationship at low (environmentally relevant) P concentrations.