Abstract
This research investigated the kinetics of phosphorus (P) release from soils by employing an improved technique-hydrous ferric aluminium binary oxide in dialysis membrane tubes (DMT-HFAO). The as-synthesized adsorbents were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared (FTIR), thermogravimetic (TGA/DTA) and Brunauer-Emmett-Teller (BET) techniques. The modified method, DMT-HFAO, was used in six soils equilibrated for a period from 1 to 42 days. Two component first order model was applied to estimate the cumulative P desorbed and P desorption indices and how these parameters are related to maize yield. The cumulative P-extracted by DMT-HFAO over 42 days significantly correlated (p < 0.01) with maize plant uptake; better than the reference single system (DMT-HFO). This indicated that DMT-HFAO is superior in mimicking plant mode of action as compared to the benchmark, DMT-HFO. Among the P fractions, HCO3-Pi, HCO3-Po and D/HCl significantly correlated with the yield parameters in both techniques. Our findings, therefore, provide some insights on the importance of this modified technique in estimating the residual P in soil. Accurate estimation of residual P is important not only from environmental perspective but also from the judicious use of this non-renewable fertilizer.
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