Relationship between phosphorus fractions of some selected Sudanese soil orders to phosphate availability

Year 2018, Volume: 7 Issue: 3, 224 - 229, 01.07.2018

Abdel Wahab Ahmed Mohamed Ahmed Mohammed Abdalla Elsheikh Yousif El Gorashi El Mahi

https://doi.org/10.18393/ejss.421609

Cited By: 2

Abstract

A laboratory experiment was conducted to
determine the extent and the importance of phosphorus (P) fractions of some
agriculturally important Sudanese soils on P availability. The soils were
gathered from different locations in Sudan, to represent three different
orders: Aridisols (Um Dum soil, North Kordofan state), Alfisols (Hagu soil,
Senar state), and Vertisols (Hosh soil, Gezira state). The soil P was
fractionated using an authenticated procedure. The results showed that the
soils had low total, organic and available P contents. Most of the inorganic
soil P was present in the Fe-Al fraction in Um Dum soil (> 50%), and about
40% of this fraction in Hagu soil, but, only 20% in alkaline Hosh soil. The
Ca-P fraction constituted > 60% in Hosh soil, about 40% in Hagu soil and 20
% in Um Dum soil.  The available P in the
top soils studied was positively related to the percent sum of Al+Fe -P of the
total P, and was negatively related to the percent Ca-P fraction content of the
total P. It has been proposed that the P sorption starts by exchange with
singly coordinate Fe or Al- OH clay (OH⁻ edge group) and quickly reorganizes into more stable and
less soluble ring forms especially at pH more than 7.0, Alkaline pH more than
8.0 in soil like Hosh, will in presence of Ca, favour with time, the formation
of inactive less soluble form like octacalcium phosphates and apatites at
expense of the initial Al and Fe-P forms which are less stable at alkaline pH.

Keywords

Phosphorus forms, total phosphorus, organic phosphorus, inorganic phosphorus, available soil phosphorus, Sudanese soils

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