ISSN:
1573-0867
Keywords:
Diammonium orthophosphate
;
triammonium pyrophosphate
;
zinc
;
fertilizer reaction products
;
Indian soils
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract Studies on the formation and identification of the nature of reaction products formed with zinc and ortho- and pyrophosphate fertilizers were carried out in chemical solutions and in contrasting Indian soils having wide pH range from acidic to alkaline. Triammonium pyrophosphate (TPP), a constituent of the newly developed ammonium polyphosphate (APP) and diammonium orthophosphate (DAP), the only orthophosphate fertilizer manufactured and used in the country were taken for these studies. The reaction products (precipitates) formed in the solutions were isolated and identified through X-ray diffraction technique and chemical analysis, and those formed at the sites of fertilizer placement separated and identified only through X-ray diffraction technique. In the study with solutions ZnNH4PO4 (orthorhombic) was identified at all levels of Zn applications and at both concentrations of 0.1Mg and 1.0M DAP; whereas, Zn3(NH4)2(P2O7)2.2H2O was observed only at the lower concentration (0.1 M) of TPP with Zn. Zinc was completely soluble at the higher concentration (1.0M) of TPP indicating the formation of a soluble complex, (NH4)6Zn(P2O7)2.6H2O. In soils, the reaction products obtained with band application of DAP alone and along with Zn fertilizers were CaHPO4.2H2O, Ca(NH4)2(HPO4)2.H2O (dimorph B), MgNH4PO4.6H2O (struvite), MgHPO4.3H2O, FePO4.2H2O (metastrengite, monoclinic), AlPO4.2H2O (orthorhombic), ZnNH4PO4 (orthorhombic) and Zn3(PO4)2.4H2O. The reaction products with TPP alone and with Zn were Ca(NH4)2P2O7.H2O, Mg(NH4)2P2O7.4H2O (monoclinic), FeH2P2O7, Ca2P2O7.2H2O (monoclinic) and Zn(NH4)2P2O7.H2O.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01050365
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