Abstract
Calcareous dark brown red soil (calcixerollic xerochrept) from northern Syria was used in a pot experiment to study the fate of triple super phosphate fertilizer (TSP) with and without a crop (local durum wheat [Triticum turgidum L. group durum (Desf.)] cv. Bohouth). The soil received 17 μg P/g soil of 32P-labeled TSP, and samples were collected from soils and plants at successive dates. Soil inorganic P was ≈ 94% of total soil P, with only 50–80% being soluble. Calcium phosphate compounds were the dominant fraction (≤ 68%) of the soluble inorganic soil P followed by occluded iron phosphate (≤ 48%), and all other fractions were ≤ 9%. Isotopic measurements showed that ≈ 50% of fertilizer P was non–exchangeable within 2 days, and TSP values in each fraction of soil inorganic P fluctuated in relatively similar proportions to the concentrations of P fractions in soil. Available P (soil & TSP) in cropped soil was more than that in the uncropped soil, and plants had no effect on the distribution of P from fertilizer amongst the different soil P fractions.
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Asfary, A., AL-Merey, R. & Al-Hameish, M. Fractionation of applied 32P labeled TSP in calcareous soils. Plant Soil 264, 171–183 (2004). https://doi.org/10.1023/B:PLSO.0000047754.15751.6d
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DOI: https://doi.org/10.1023/B:PLSO.0000047754.15751.6d