Phosphorus Adsorption Using Kinetic Models Of Some Soils Of Wolaita Zone, Southern Ethiopia

IJEP 41(12): 1418-1427 : Vol. 41 Issue. 12 (December 2021)

Mesfin Kassa1 and M. Senapathy2*

1. Wolaita Sodo University, Department of Plant Sciences, College of Agriculture, Ethiopia, East Africa
2. Wolaita Sodo University, Department of Rural Development and Agricultural Extension, College of Agricul-ture, Ethiopia, East Africa


Phosphorus (P) adsorption, in soils is a key cycle overseeing its accessibility for crops, characteristics were determined in four soils in Wolaita of Southern Ethiopia. 3 g of soil was equilibrated in 30 mL of 0.01 M CaCl2 containing KH2PO4 in 0, 5, 10, 15 and 20 mg P/L. Kinetic models, like Langmuir, Freundlich, Temkin and Van Hauy were applied on four soils; kinetic parameters (b, Kf, a and m) showed values 0.36-1.53, 147.91- 851.13, 2.29-3.48, 0.11-0.16 mg/kg for selected soils. In soils 1, 3 and 4 Van Hauy model demonstrated predominance over different models, while in soils 2 and 3 Freundlich model demonstrated better results. Notwithstanding, in soil 2 both Freundlich and Temkin models showed results within standard. Langmuir models was found better in soil 4 (r2=0.92) followed by soil 2 (r2=0.88) aside from b and EPRF (r2=1.000** and 0.96**). The EPR (0.2 mg/L) was altogether related to kinetic model (r2=1.00***) that supports the way energy coefficient of soil is a significant file for arranging phosphorous the board techniques. Among the four soils, to keep up ideal phosphorous fixation in soil for crop development, Wolaita soil need more phosphorous manure.


Acidic soil, adsorption isotherm models, Soil properties, Standard phosphorous requirement


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