Silicon behavior in soils contained different silicon and phosphorus concentrations using adsorption models

الملخص EN

Silicon (Si) is an element, not essential, but is beneficial for some plants.

The Freundlich model was used to describe Si adsorption on soil sam-ples incubated with different Si and phosphorus (P) concentrations.

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 ei-ther 7 or 10 mg P L-1.

In final, T9 and T10 soil con-tained 200 mg Si L-1 in combined with either 7 or 10 mg P L-1.

A series of adsorption experiments were performed using sodium metasilicate pen-tahydrate (Na2O3Si.5H2O) solution prepared to have concentrations representing 0, 14, 28, 42 and 56 mg Si L-1.

The supernatant of Si concentration was determined.

The amount of element adsorbed was calculated as the difference between applied element concentrations and that remaining in solu-tion after equilibration.

Adsorption isotherms were determined at room temperature (25 oC±1).

Results revealed that a positive trend was gen-erally found; increases in amount of adsorption onto soil with increasing Si concentration and equi-librium concentration in concerned solution either applied separately or applied + initial available Si concentration in soil.

The Freundlich equation pro-vides a good fit to the sorption data for all incubat-ed soil samples and R2 values were ranged from 0.82 to 0.97.

Present study indicated that adsorp-tion capacity value (Kf) decreased from T1 to T3 soil samples then increased at T4 sample, and intensity adsorption values (1/n) gave almost an opposite trend to that of capacity adsorption (Kf) values.

Moreover, adsorption of Si onto soil incubated with different Si concentrations in combined with P2 decreased as compared to P1.

Opposite trend was obtained with equilibrium Si concentration in con-cerned solution.

Also, present study showed that the higher values of Kf obtained in P1 soils (T5, T7 and T9), compared to Kf values of P2 soils (T6, T8 and T10), and intensity adsorption values (1/n) gave almost an opposite trend to that of capacity adsorption (Kf) in both P1 and P2 soils.

Finally, large Si sorption capacity and low Si affinity for the surface sites were observed in soil incubated with high Si concentration compared to soil incubated with low ones.