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Mineralization of Inositol Penta and Hexaphosphate in Soils

R. MANDAL
Department of Soil Science, University of Da

A. ISLAM
Department of Soil Science, University of Da

Abstract/ Executive Summary:

The nature of changes of inositol penta -- and hexaphosphate in some Bangladesh soils have been studied. Mineralization of both the compounds occurred at different moisture levels. Mineralization of inositol penta - and hexaphosphate was continual, but the rate decreased with time. Mineralization was found to be a function of moisture, organic matter, pH and content of soil inositol penta -- and hexaphosphate with a positive correlation.

Keywords: Hexaphosphate, Mineralization, Soil

Location:

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

Mineralization depends to a greater extent upon the nature of phosphorus containing organic complexes and the environmental conditions under which the biochemical transformation takes place. Mineralization of phosphorus is also associated with the hydrolysis of the salts of inositol hexaphosphate with metal ions like Fe and Al. Experiment was, thus, conducted to study the soil inositol penta and hexaphosphate mineralization under various conditions

Methodology:

Three samples of surface soils (C-tr5 cm) representing three different series and varying in physical and chemical properties were collected from Bangladesh. Determinations were made of pH by Cornning glass electrode method (the soil : water ratio being 1 : 2.5), organic matter by wet oxidation method, organic phosphorus by Mehta et al. inositol pentaphosphate by McKercher and Anderson and inositol hexaphosphate by Anderson and Malcolm. Air-dried soil samples (10g) with lime (to bring the pH to 7.0) and without lime placed in the test tubes (10 cm ×1 cm) were kept at 0 (air-dried), 50 and 100 per cent of the water holding capacity and under submerged condition (3 cm above the surface) althrough. The experiment was arranged in a completely randomized design with three replications. The test tubes at all moisture levels, except submerged condition, were incubated at 27ºC (+0.5ºC) following the barium peroxide method of Cornfield

Source of Information: Journal of Bangladesh Academy of Sciences, Vol. 2, No. 2, 1978

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Under a set of conditions, mineralization increased with time with a decrease in rate in both the compounds, but the rate of mineralization of inositol pentaphosphate was more rapid than that of inositol hexaphosphate with the corresponding dates. More than 70% inositol pentaphosphate mineralized within 15 days of the experiment, however, that of inositol hexaphosphate was nearly 50%. Inositol pentaphosphatemineralized completely within 60 days of experiment in all the soils treated with lime under submerged condition. It may be attributed to the degree of dissociation of the respective phosphate compound under the prevailing conditions, The amount of inositol hexaphosphate mineralized in all the treatments were more in Harta than Naldanga samples and the least amount was observed in Paysa soil. This might probably be due to the variation in amounts of organic matter and inositol hexaphosphate content of the soils It seems probable that increased dissociation of the complexes and. prevention of refixation (reformation) are conducieve for increased mineralizaiion. So, the conditions directly or indirectly responsible for the factors mentioned needs to be molded for increased mineralization of phosphorus from the soil stored organic phosphorus.

Knowledge Management: Journal