
	International Journal of Agricultural Research
	Year: 2012 \| Volume: 7 \| Issue: 8 \| Page No.: 388-397 DOI: 10.3923/ijar.2012.388.397

Characterization of Some Representative Calcareous Soils of Bangladesh with Respect to Soil Phosphorus Requirements

Mohammad Z. Afsar and Mohammad Enayet Hossain

Abstract: Phosphate sorption equations have been widely used to characterize soils with respect to their phosphorus requirements (P_req). For the sorption study, the soils were equilibrated with 0.01 M CaCl₂ solution containing graded concentrations of phosphate (0, 1, 10, 25, 50, 100 and 150 mg P L^-1). The P_req values of four calcareous soils were determined from the Langmuir, Freundlich and Temkin equations. The Langmuir equation was best fitted to the P sorption data. Among the four soil series, the Ghior soil series occupying the lowest position of catena sorbed the highest amount of phosphate. The amounts of sorbed P maintaining 0.2 mg P L^-1 in soil solution ranged from 14.14 to 33.56, 27.99 to 45.80 and 16.16 to 51.72 mg kg^-1 soil which were derived from the respective Langmuir, Freundlich and Temkin equations. P_req values derived from the Freundlich and the Langmuir equations were negatively correlated with Olsen-P content of the soil (r >-0.975, p<0.05). Again, P_req values determined from the Freundlich equation were positively correlated with percent clay content (r >0.901, p<0.05) of the soil. Phosphate was sorbed by the soils in the following order: Ghior>Ishurdi>Gopalpur>Sara soil series. However, based on their P_req values, the soils can be arranged in the following order: Ishurdi>Ghior>Gopalpur>Sara soil series. To maintain a desired P concentration in the soil solution, the Ishurdi soil will be required to supply more P than others.

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RELATED ARTICLES:

•	A Comparison of the Langmuir, Freundlich and Temkin Equations to Describe Phosphate Sorption Characteristics of Some Representative Soils of Bangladesh

•	Determining Phosphorus Adsorption Isotherm in Soil and its Relation to Soil Characteristics

•	Determining of Soil Phosphorus Requirement with Application of Freundlich Adsorption Isotherm

How to cite this article:

Mohammad Z. Afsar and Mohammad Enayet Hossain, 2012. Characterization of Some Representative Calcareous Soils of Bangladesh with Respect to Soil Phosphorus Requirements. International Journal of Agricultural Research, 7: 388-397.

DOI: 10.3923/ijar.2012.388.397

URL: https://scialert.net/abstract/?doi=ijar.2012.388.397

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