The m'neral composition of medlarfnrit collected (June I5 -October 8) in Turkey atfive stages of development was studied. In thefnrit. 32 minerals were analyzed and 16 minerals (Al, Ba, Ca. Cu, Co, Fe, K, Li, Mg, Mn. Na. Ni, P, Sr, Ti and Zn) were present at detectable levels. The ripe medlar h i t was richest in potassium (7370 pg/g dry wt). calcium ( I 780 pg/g dry wt). phosphorus (1080 pg/g dry wt). magnesium (661 pg/g dry wt) and sodium (183 pg/g dry wt). During the fruit development, Al. Ba, Fe, Mn, P, Sr. and Zn were highest in August (unripe fruits) while the concentrations of K, Ca, Mg and Cu gradually decreased throughout development. The ripe medlar fruit is an important source of nutritionally needed minerals and trace elements, in particular Ca, Cu, Fe. K, Mg, Mn. Na and Zn, for human populations in sourheastern Europe, Turkey and Iran.

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Abstract. The dependence of the indicator of phosphate sorption capacity on extractable Al and Fe and other soil properties was studied in a material consisting of 102 mineral soil samples. The sum of P adsorbed on soil during two days from a solution containing P 5 mmol/1 and P extracted by 0.02 M EDTA (pH 5.3) as an estimate of the initial P content in the soil was used as the indicator of P sorption capacity.In clay and silt soils (n = 51), the Al and Fe extracted by 0.05 M oxalate (pH 2.9) together with the organic C content explained 85 Vo, the Al and Fe extracted by 0.05 M K 4 P 2 0 7 (pH 10) together with the clay content 87 Vo, the Al and Fe extracted by 0.02 M EDTA (pH 5.3) 91 Vo, and the Al extracted by 1 M CH 3 COONH 4 (pH 4.8) together with the organic C and clay contents 78 Vo of the variation of the indicator of phosphate sorption capacity. In coarse soils (n = 51), the variation of the indicator was explained well only by oxalate-extractable metals, which together with soil pH and clay content explained 80 Vo of the variation. Extractable Al was generally the most important explainer of variation. The results suggest that forms of extractable Al and Fe explaining the variation of the indicator of P sorption capacity in clay and silt soils are partially different from those in coarse soils.