Vol. 3 (2) : March-April 2012 issue
Green Farming Vol. 3 (2) : 127-131 (March-April, 2012)
Efficiency of carboxylate anions and protons of four organic acids in mobilization of native phosphorus from arid soil
AMITA GHARU1, INDIRA RATHORE2 and J.C. TARAFDAR3*
Central Arid Zone Research Institute (ICAR), Jodhpur - 342 003 (Rajasthan)
Designation : 1,2Research Associate, 3Pricipal Scientist & ICAR National Fellow *(jctarafdar@yahoo.in)
Subject : Soil Science & Agric. Chemistry; Soil Health & Soil Conservation Engg.
Paper No. :
Total Pages : 5
Received : 04 January 2012
Revised accepted : 21 March 2012
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Citation :
AMITA GHARU, INDIRA RATHORE and J.C. TARAFDAR. 2012. Efficiency of carboxylate anions and protons of four organic acids in mobilization of native phosphorus from arid soil. Green Farming Vol. 3 (2) : 127-131 ; March-April, 2012
ABSTRACT
The efficiency of four organic acids (lactic, formic, citric, malic) towards mobilization of native unavailable phosphorus in available form for the nutrition of plants was assessed in an Aridisol. The results indicate that the higher P mobilization was observed with lactic and formic acid followed by citric acid and least with malic acid. A significant negative correlation (r2 = 0.955, p < 0.01) of decline in pH with increase in concentration of four organic acid was observed. The contribution of carboxylate anion (R-COO-) towards P mobilization was enhanced with increasing the concentration of organic acid, while the contribution by H+ (proton) decreased. Among the carboxylate anions present in four organic acids, the anion in formic acid was found to contribute most to the available P release. In general, the P mobilization by H+ ion was 51% higher than carboxylate anion.
Key words :
Carboxylate anions, citric acid, formic acid, lactic acid, malic acid, native phosphorus mobilization, protons.
