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Effect of Polymer on Potassium Fixation in Soils

S. M. Imamul Huq
Department of Soil Science, University of Dhaka, Dhaka-1000, Bangladesh

H. Khatun
Department of Cherrristry,University of Dhaka, Dhaka-1000, Bangladesh

H. Ahmed
Department of Cherrristry,University of Dhaka, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

Water soluble pulymer of tamarind gum isolated from the seeds of tamarind (Tamarindus indica). was used as a soil modifier on two soils: salt affected and normal, and its effect on K- fixation was studied. Polymer treatment was effective in decreasing fixation of both native potassium and added potassium in both the soils.However, when the soils were treated with the polymer after removing organic matter from them by H₂0₂ treatment, K-fixation was found to have increased in both soils.Attempt was made to correlate observed K-dynamics with the CEC of the soils and the polymer adsorbed on it..

Keywords: Tamarind, Tamarind seed, Soil, Patassium

Location: Department of Soil Science, Dhaka University, Bangladesh.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Contamination of soil

Objectives:

To study the effect 'of tamarind seed polymer as a soil conditioner on the K- fixation/release capacity of two different types of soils of Bangladesh.

Methodology:

Two soil samples representing two soil series, viz., Amtali and Polashbari, were used in the experiment. The Amtali oil is salt affected while Polashbari soil is a nor-mal one. The air dry soils were treated with 30% H₂0₂ to remove organic matter from them. Water soluble polymers of tarmarind seeds were isolated and purified following the procedure developed. This polymer gum was used to treat the soils. 1000 ml of 2500 ppm polymer solution was added to 100 g of soils before and after removal of organic matter. The suspension was stirred for about 15 minutes and was left for 24 hours. The supernatant was discarded and fresh portions of 1000 nil of the polymer solution was added to the soils to ensure the complete adsorption-of the polymer on the soils. The polymer treated soils were washed with distilled water, oven dried at 80°C for 48 h, ground and seived through 90 mesh seive. These polymer treated soils as well as the non-treated soils were then used for the K fixation study. To each category of soils (normal soils, organic matter removed soils, polymer treated normal soils, polymer treated organic matter removed soils) K in the form of KCL solution at concentrations of 0, 125, 250 and 500 ppm were added. K-fixation in these soils were simulated in the laboratory and studied following the procedures described in Imamul Huq et. al. (1976). pH of the soils was determined by a pH meter at a soil: water ratio of 1:2.5; total carbon by Walkley and Black (1947) wet oxidation method; total nitrogen by alkali distillation of the Kjeldahl digest (Black 1965). Organic matter was calculated by multiplying the% organic carbon with 1.72. CEC of the soils was determined by NH + saturation method (Black 1965). Soi/-K was extracted by shaking the soil for half an hour with IN NH₄0Ac at pH 7.0. The soil extractant ratio was maintained at 1:10.All experiments were done in triplicates and the results presented in the text are averages of three individual replicates.

Source of Information: BANGLADESH JOURNAL OF SOIL SCIENCE, Vol, No.-21, No.-1, 1990

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In presenting the results, the legends A1, A2, A3, A4 and Pl, P2, P3 and P4 have been used t9- indicate the soils of Amatali (all As) and Polashbari (all Ps) for soil with organic matter and not treated with polymer (A1, Pl), soil with O. M. but treated with the polymer (A2, P2), soil without O.M. but treated with the polymer (A3, P3) and soil without O.M. but treated with polymer (A4, P4) respectively. The soil conditioners, mostly polymers of organic origin, are likely to interact with clay minerals in a similar manner as organic mat ter and effect K fixation in soils.It is known, however, that these polymers interact in a significantly complex way. Polymer adsorption is irreversible and molecular weight dependent. Only limited information is available on the penetration of polymers in the interlayers of clay minerals and its effect on K fixation. K fixation in modified soil could be related to the extent of adsorption of the gum which is again related to the clay complex present in the soil samples. Detailed investigation with model clay systems needs to be done to elucidate the effect of polymer induced modification on K- fixation phenomena.

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