Fractionation of Micronutrients in Selected Soils from Saudi Arabia PDF

Keywords

micronutrients, fractionation, Saudi Arabia

Abstract

Fractionation of micronutrients into 5 fractions was carried out on ten selected soils in Saudi Arabia (Tessier et al 1979). The ranges for different micronutrient fractions were: 0- 796,0-105, 0- 75 amd 0- 59942 ug/g for Mn, Zn, Cu and Fe, respectively. The residual fraction constitutes the absolute majority of all fractions and the order of the 5 fractions was: Residual > Fe-Mn Oxide bound > CO3 bound> organic bound> exchangeable. The DTPA extractable micronutrients ranged from 1.56- 16.30 ug/g for Mn, 0.09- 2.20 ug/g for Zn, 1.51-17.7 ug/g for Fe and 0.07- 2.73 ug/g for Cu extraction of micronutrients with DTPA showed strong relationship with micronutrients estimated by using different fractionation schemes. Therefore, it is considered a good estimation for the availability of micronutrients in the studied soils.