基于多元回归估算残留P

The remaining phosphorus （Prem）, P concentration that remains in solution after shaking soil with 0.01 mol L-1 CaCl2 containing 60μg mL-1 P, is a very useful index for studies related to the chemistry of variable charge soils. Although the Prem determination is a simple procedure, the possibility of estimating accurate values of this index from easily and/or routinely determined soil properties can be very useful for practical purposes. The present research evaluated the Prem estimation through multiple regression analysis in which routinely determined soil chemical data, soil clay content and soil pH measured in 1 mol L-1 NaF （pHNaF） figured as Prem predictor variables. The Prem can be estimated with acceptable accuracy using the above-mentioned approach, and pHNaF not only substitutes for clay content as a predictor variable but also confers more accuracy to the Prem estimates.

Remaining phosphorus estimate through multiple regression analysis

The remaining phosphorus (P_rem), P concentration that remains in solution after shaking soil with 0.01 mol L⁻¹ CaCl₂ containing 60 μg mL⁻¹ P, is a very useful index for studies related to the chemistry of variable charge soils. Although the P_rem determination is a simple procedure, the possibility of estimating accurate values of this index from easily and/or routinely determined soil properties can be very useful for practical purposes. The present research evaluated the P_rem estimation through multiple regression analysis in which routinely determined soil chemical data, soil clay content and soil pH measured in 1 mol L⁻¹ NaF (pHnaf) figured as P_rem predictor variables. The P_rem can be estimated with acceptable accuracy using the above-mentioned approach, and pHNaF not only substitutes for clay content as a predictor variable but also confers more accuracy to the P_rem estimates.