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Role of organic acids produced during decomposition of rice straw in the solubilization of rock phosphate

KrishiKosh

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Title Role of organic acids produced during decomposition of rice straw in the solubilization of rock phosphate
 
Creator Anju Kumari
 
Contributor Kapoor, K.K.
 
Subject Organic acids, Tricalcium phosphate , Udaipur rock phosphate, Rice straw decomposition, Phosphate solubilization, Phosphate solubilizing microorganisms
 
Description Production of organic acids by phosphate solubilizing microorganisms is
the most important mechanism of P solubilization. There is solubilization of P
from insoluble P sources such as rock phosphate during decomposition of
lignocellulosic wastes. The identification of organic acids produced during
decomposition of rice straw was attempted in the present studies. Changes during
decomposition of rice straw amended with tricalcium phosphate (TCP) and
Udaipur rock phosphate (URP) were studied in laboratory incubation experiment.
Initially C: N ratio was adjusted to 40:1. The organic C content of rice straw was
found to decrease and total N increased with time, with the effect C: N ratio of rice
straw decreased as the decomposition progressed. At 15 days, the pH decreased to
acidic range in all the treatments, which again increased to alkaline range at 30 and
60 days. Water-soluble P and Citric acid soluble P increased at 15 days incubation
and decreased at 30 and 60 days decomposition period. The amount of citric acid
soluble P was higher in treatments containing TCP or URP. Citric, oxalic, formic
and maleic acid were detected during decomposition of rice straw. Citric acid and
oxalic acids were produced almost in all the treatments and the maximum amount
of organic acids were detected at 15 days. The concentration decreased to
negligible amount at 30 and 60 days. Citric acid and oxalic acids were the major
acids produced which are responsible for P solubilization from TCP and URP.
Citric acid was found to be most effective in solubilization of TCP and URP. The
P solubilization with sulphuric acid was lower as compared to organic acids.
 
Date 2016-12-01T13:45:34Z
2016-12-01T13:45:34Z
2005
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/88627
 
Language en
 
Format application/pdf
 
Publisher CCSHAU