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KINETICS RELEASE OF ORTHOPHOSPHATE FROM AMMONIUM PHOSPHATE IN CALCAROUS SOILS | ||
| IRAQ JOURNAL OF AGRICULTURE | ||
| Article 1, Volume 15, Issue 1, 2010, Pages 0-0 | ||
| Authors | ||
| N. A . Al.Saadie; F. H. Al-Hadethi; J. K. Al.Uqaili | ||
| Abstract | ||
| Chemical dynamic experiment was conducted to verify the reaction of orthophosphate released from two ammonium phosphates (i.e. MAP and DAP), with and w/o two kinds of amendments (viz, Na4P2O7 and H2SO4) in two calcareous soils (namely, clay and sandy loam) for ten incubation time (0-720hr) at three incubation temperatures 283, 298 and 308 Kelvin (k). The results confirmed that the Freundlich model was the best for prediction and describing the orthophosphate ion released with high r2 (0.960**) highest t (12.20), and lowest SE.e (0.14). The mean values of rate constant of orthophosphate released were largely enhanced by increased the temperature from 283 upto 308 k, and also it significantly enhanced when using Na4P2O7 as amendment with both test fertilizers. Also the mean values of activation energy (Ea) of orthophosphate were highest with DAP (25.43) and without amendment (22.68) and in sandy loam soil (21.80 kJ mol-1), respectively. It was concluded that monoammonium phosphate with and w/o Na4P2O7 and H2SO4 is the best for hastening release reaction rate of orthophosphate ions in both calcareous soils tested. | ||
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