SP {soilchemistry}

Supply parameter of phosphorus in soil

Description

This function generates the supply parameter (SP) of phosphorus in soil as described by Khasawneh and Copeland (1973).

Usage

SP(W = W, V = V, Ci = Ci, Cf = Cf,...)

Arguments

W

Mass of soil sample (g)

V

Volume of extractant solution (mL)

Ci

Initial concentration (mg/L) of the added element, e.g., phosphorus

Cf

Final or equilibrium concentration (mg/L) after adsorption of the same element

...

Any other argument that can be passed to base plot

Value

SP - Supply parameter (mg^0.5)/(kg L)^0.25

References

Khasawneh, F.E., 1971. Solution ion activity and plant growth. Soil Science Society of America Proceedings 35, 426–436. Khasawneh, F.E., Copeland, J.P., 1973. Cotton root growth and uptake of nutrients: relation of phosphorus uptake to quantity, intensity, and buffering capacity. Soil Science Society of America Proceedings 37, 250–254.

Examples

with(data = df_sordes, SP(W = 2, V = 20, Ci = Initial_conc, Cf = Equilibrium_conc,
col = rgb(red = 1, green = 0, blue = 0, alpha = 0.5), pch = 16, cex = 1))