Effects of Organic and Inorganic Materials on Soil Acidity and Phosphorus Availability in a Soil Incubation Study

Figure 4

Increase in Olsen P above the control treatment as affected by FYM and MPR at Bukura. Note: “combined appl.” refers to the observed increase in Olsen P above the control obtained when FYM (at 20 kg P ha⁻¹) was applied in combination with MPR (at 40 kg P ha⁻¹), while “individual appl.” refers to the increase in Olsen P above the control obtained when FYM, applied alone at 20 kg P ha⁻¹, was added to the increase in Olsen P above the control obtained when MPR was applied alone at 40 kg P ha⁻¹.