Optimizing available phosphorus in calcareous soils fertilized with diammonium phosphate and phosphoric acid using freundlich adsorption isotherm

A. Naeem, M. Akhtar, W. Ahmad

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    In calcareous soils, phosphorus (P) retention and immobilization take place due to precipitation and adsorption. Since soil pH is considered a major soil variable affecting the P sorption, an acidic P fertilizer could result in low P adsorption compared to alkaline one. Therefore, P adsorption from DAP and phosphoric acid (PA) required to produce desired soil solution P concentration was estimated using Freundlich sorption isotherms. Two soils from Faisalabad and T. T. Singh districts were spiked with 0, 10, and 20 % CaCO3 for 15 days. Freundlich adsorption isotherms (P=aCb/a) were constructed, and theoretical doses of PA and DAP to develop a desired soil solution P level (i.e., 0.20 mg L-1) were calculated. It was observed that P adsorption in soil increased with CaCO3. Moreover, at all the levels of CaCO3, P adsorption from PA was lower compared to that from DAP in both the soils. Consequently, lesser quantity of PA was required to produce desired solution P, 0.2 mg L -1, compared to DAP. However, extrapolating the developed relationship between soil CaCO3 contents and quantity of fertilizer to other similar textured soils needs confirmation. © 2013 Asif Naeem et al.
    Original languageEnglish
    Pages (from-to)5pp
    JournalThe Scientific World Journal
    Volume2013
    DOIs
    Publication statusPublished - 2013

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