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Phosphorus Sorption Charcteristics in the Profile of BARIsal Series of Pstu Farm Soil

A.J.M. Hamidur Rahman
MS student
Department of Soil Science, Patuakhali Science and Technology University, Patuakhali-8602, Bangladesh

Dr. Md. Fazlul Hoque
Professor and Research supervisor
Department of Soil Science, Patuakhali Science and Technology University, Patuakhali-8602, Bangladesh

Abstract/ Executive Summary:

Nutrient stratification especially for phosphorus is essential to understand leaching of environmental crucial element to ground water and potentiality of soil to supply P. The present investigation involves characterization of soil samples collected from Barisal series of tidal floodplain region for maximum P sorption capacity, energy of adsorption, buffering capacity of P and P saturation. The Langmuir adsorption isotherm was found well to explain the P adsorption in most of the soil samples where coefficient of determination (R²) value ranged from 0.7151 to 0.9638. The Freundlich adsorption isotherms were also fitted well in the studied soils. The Freundlich adsorption isotherm (R² value varied from 0.9738 to 0.9985) fitted well in the studied soils than the Temkin adsorption isotherm (R² value ranged from 0.8206 to 0.9266). Maximum phosphorus adsorption capacity (MPAC) of different soil samples collected from different horizons varied from 1249 to 1999 mg kg^-1. Soil collected from B22g horizon (soil no. 4) had the highest (0.54 µg ml^-1) energy of adsorption and AP2g horizon (soil no. 2) had the lowest energy of adsorption of 0.19 µg ml^-1. Energy of adsorption varied from 0.19 to 0.54 µg ml^{– 1}. Phosphorus buffering capacity ranged from 225.11 to 328.00 and P saturation ranged from 0.06 to 0.53 µg mol g^-1. The amount of phosphorus present and their distribution in different soil horizons are related to the growth and development of crop. Phosphorus sorption reactions and the phosphorus buffering capacities of soil play an important role both in agronomic and environmental aspects of P management and fertilizer recommendation for crop production.

Keywords: Sorption capacity, Energy adsorption, Buffering capacity, Floodplain soils, Phosphorus sorption

Location: PSTU farm

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Land management

Objectives:

To determine the phosphorus sorption characteristics of Barisal series of PSTU farm soil.
To assess the phosphorus saturation condition of the selected soil series.

Methodology:

The experimental typical soil samples were collected from PSTU farm to study phosphorus sorption characteristics. The site for soil samples were selected and collected by digging a pit with the help of the Soil Resources Development Institute (SRDI), Patuakhali.

Collection and preparation of soil sample

A pit of 5^/ ^ 4^/ ^ 6^/ was dug up to parent material (up to depth of 140 cm) at the soil sampling site. For recording the detailed soil properties, the soil profile was studied following the Soil Survey Staff (2003). Each horizon of the profile was studied with respect to morphological, physical and chemical properties. A total of six soil samples were collected by horizon basis from selected area. The collected soil samples were air dried ground and passed through a 20 mesh (2 mm) sieve. The sieved soil samples were then stored into plastic container for physical, chemical analysis and for sorption study.

Phosphorus sorption

Phosphorus sorption isotherm studies following the procedure of Nair et al. (1984). The equilibrium P concentration data were interpreted by Langmuir, Freundlich and Temkin Equations. Phosphorus saturation (P_sat), offered by Sharpley (1995), was estimated by Mehlich-3 (M3) extractable P (Mehlich, 1984) and adsorption maxima (S_max) from Langmuir P adsorption isotherm.

Calculation of S_max, Adsorption energy and P-buffering capacity

The phosphorus adsorption maximum (S_max) was calculated using the Langmuir adsorption equation and the P-buffering capacity of soils has been calculated from the Temkin equation (Eq. 3), where b is considered the P-buffering capacity.

Source of Information: MS Thesis

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Given the diversity in properties, the studied soil samples were different in the P sorption capacity, energy of adsorption, P buffering capacity and P saturation. Phosphorus buffering capacity of upper horizons is grater than those of lower horizons. There is a variation in the P sorption characteristics in the soil samples collected from Barisal series of Ganges Tidal Floodplain region of Bangladesh. These variations in the P sorption characteristics in soils collected from the same series seem to closer look of the soil for P management.

Knowledge Management: Thesis