INFLUENCE OF INCUBATION PERIOD, TEMPERATURE AND DIFFERENT PHOSPHATE LEVELS ON PHOSPHATE ADSORPTION IN SOIL
A. Rajput, Q. A. Panhwar, U. A. Naher, S. Rajput, E. Hossain and J. Shamshuddin
DOI : 10.3844/ajabssp.2014.251.260
American Journal of Agricultural and Biological Sciences
Volume 9, Issue 2
Phosphorus (P) is the most important element after nitrogen but P sorption properties are poorly documented in many soils. In this study, P sorption capacity in relation to incubation period and temperature under various P levels were determined for two different soil series (Rustam and Miani). Phosphorus was added at 5, 10, 25, 50, 100, 250, 500 and 1000 µg g-1 to the soils and incubated for the period of 1, 3, 7, 15, 30 and 60 days at 25 and 35±1°C temperatures. Phosphorus sorption was significantly influenced by the temperature, added P and incubation period. Clay content has major influence on P sorption. Rustum Series adsorbed more P than that of Miani Series. The P sorption was faster at high temperature (35°C). At the end of period in the Rustum Series with added 2.5 and 1000 µg g-1 P level, P sorption were found 0.7 and 943 µg g-1, respectively, at 25±1°C temperature, whereas at 35±1°C temperature the respective P sorption for same P levels were 1.8 and 987.0 µg g-1. In the Miani Series at 25±1°C temperature, P sorption was 0.7 and 941 µg g-1, while at the temperature of 35±1°C, P sorption were 1.0 and 986 µg g-1 soil. Increasing P levels, temperature and incubation, resulted in higher P sorption. Hence, high clay in combination with calcium carbonate contents enhanced P adsorption, while high organic matter and high native soil P resulted in lesser P adsorption.
© 2014 A. Rajput, Q. A. Panhwar, U. A. Naher, S. Rajput, E. Hossain and J. Shamshuddin. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.