Impact of fertilizer phosphorus application on phosphorus release kinetics in some calcareous soils |
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Authors: | A R Hosseinpur F S Biabanaki |
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Institution: | (1) Soil Science Department, College of Agriculture, Shahrekord University, Shahrekord, Iran;(2) Soil Science Department, College of Agriculture, Buali Sina University, Hamadan, Iran |
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Abstract: | Phosphate reactions and retention in the soil are of paramount importance from the perspective of plant nutrition and fertilizer
use efficiency. The objective of this work was to study the kinetics of phosphorus (P) desorption in different soils of Hamadan
in fertilized and unfertilized soils. Soils were fertilized with 200 mg P kg−1. Fertilized and unfertilized soils were incubated at 25 ± 1°C for 6 months. After that, release of P was studied by successive
extraction with 0.5 M NaHCO3 over a period of 1,752 h. The results showed that phosphorus desorption from the fertilized and unfertilized soils began
with a fast initial reaction, followed by a slow secondary reaction. The amount of P released after 1,752 h in fertilized
and unfertilized soils ranged from 457 to 762.4 and 309.6 to 586.7 mg kg−1, respectively. The kinetics of cumulative P release was evaluated using the five kinetic equations. Phosphorus desorption
kinetics were best described by parabolic diffusion law, first order, and power function equations. Rate constants of these
equations were higher in fertilized than unfertilized soils. Results from this study indicate that release rate of P plays
a significant role in supplying available P and released P in runoff. |
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Keywords: | Phosphorus fertilizer P released Kinetics models |
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