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Relative Agronomic Effectiveness of phosphate rocks and P adsorption characteristics of an Oxic Rhodustalf in Eastern India
Author(s) -
Ghosal Prabir K.,
Chakraborty Trishit,
Bhattacharya Buddhadeb,
Bagchi Dipak K.
Publication year - 2003
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/jpln.200321034
Subject(s) - adsorption , phosphate , phosphorite , langmuir , langmuir equation , freundlich equation , chemistry , plateau (mathematics) , mineralogy , soil science , environmental chemistry , geology , mathematics , biochemistry , mathematical analysis , organic chemistry
The Relative Agronomic Effectiveness (RAE) of rock phosphates as compared to water soluble Triple Super Phosphate was measured on direct, residual, and cumulative application of the P fertilizers in a field experiment with rice on an Oxic‐Rhodustalf in the eastern plateau region of India. The fertilizers were Morocco Rock Phosphate (MORP), Mussoorie Rock Phosphate (MRP), Partially Acidulated Rock Phosphate (PARP), and Triple Super Phosphate (TSP). The RAE of the rock phosphates were lower for direct application (54–80 %) and cumulative application (70–93 %) of P but roughly equal or larger for the residual effect (92–142 %) as compared to TSP. The P adsorption characteristic of the experimental soil conformed to the linear relationship of both Freundlich and Langmuir isotherm equation. The adsorption data when plotted according to Langmuir equation deviated from a single linear relationship at higher concentration (10 μg ml –1 ), thereby giving two adsorption maximum values ( 68.49 μg g –1 and 256.41 μg g –1 ) and binding energies ( 2.86 ml μg –1 and 0.089 ml μg –1 ) for the soil. Two populations of P adsorption site with widely different affinity for P probably existed in the soil.