Reaction products of Phosphorous fertilizers in calcareous soils with different parent materials

Publication Date : 30/04/2015


Author(s) :

Arya Lekshmi, V. , Dr. S. L. Budihal.


Volume/Issue :
Volume 1
,
Issue 4
(04 - 2015)



Abstract :

Reaction products of Phosphorous fertilizers in calcareous soils with different parent materials ARYA LEKSHMI, V. and S. L. BUDIHAL Department of Soil Science and Agricultural Chemistry College of Horticulture, Vellanikkara, Thrissur, Kerala - 680656 Email: aryalekshmi@gmail.com Abstract: The transformation of added phosphorus into distinct fractions during incubation of three calcareous soils of different parent materials was studied. Applied phosphate transformed mostly into Pedogenic Ca-P followed by reductant-soluble P in all the three soils. Al- and Fe- bound P fraction was higher in red soil than in brown or black soil, despite having least amount of free Fe-oxide content. The mild reductant-soluble P decreased rapidly and vanished after first few days of incubation. None of the fertilizers used did contribute to this fraction of P. The reductant-soluble P increased to about 5 times (up to 500 mg kg-1) by the end of first week of incubation and remained so during remaining period of incubation. The lithogenic apatite did not show much variation either from the start or during incubation. Key words: P- fertilizers, reaction products, calcareous soil


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