Phosphate adsorption characteristics in selected wheat grown calcareous soils
2007
Shahbazi, Karim | Majidi, Aziz | Esmailzadeh, Lila | Bazargan, Kambiz | Ardabili, Mahnaz | Mansory, Fatemeh | Tahmasebi, Korosh | Noroziazar, Mohammad Reza | Valipor, Hanieh
Adsorption and desorption of phosphorus in soils are among the key processes governing its availability to crops. The understanding of sorption and desorption by soils is important for fertilizer management. In this study, we examined phosphate sorption in 23 soil samples where collected from wheat grown calcareous soils. For this purpose, 3 grams, of 2-mm soil were equilibrated for 48 hours at 25 °C in 30 ml of 0.01 M CaCl2 with varying amounts of P. Sorbed phosphorus was calculated by the difference between P initially added and P remaining in the final solution. Langmuir, Freundlich, and linear equations were fitted to the sorption data. Phosphate sorption data at 25°C were fited to the Freunlich, Langmuir, Van Huay and linear adsorption isotherm. The soil varied widely in their capacity to sorb P. Phosphorus-sorption for all soils fit both Freundlich, Van Huay isotherms well (R2
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