Silicon Adsorption on Clay Soils Affect by Silicon and Phosphorus Addition Using Freundlich Adsorption Model

Silicon (Si) is an element, not essential, but is beneficial for some plants. The Freundlich model was used to describe Si adsorption on soil samples which pretreated with different Si and phosphorus (P) concentrations and inculpated for 60 days. Soil incubated samples were: T1 soil had no Si or P (control); T2, T3 and T4 soils contained 50, 100, and 200 mg Si L-1, respectively. T5 and T6 soils contained 50 mg Si L-1 in combined with either 7 or 10 mg P L-1 along with T7 and T8 soil contained 100 mg Si L-1 in combined with either 7 or 10 mg P L-1. Finally, T9 and T10 soil contained 200 mg Si L-1in combined with either 7 or 10 mg P L-1.