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Activity and thermodynamic parameters of urease in soils amended with organic residues
An experiment was conducted to study the thermodynamic parameters (Q10, Ea, ∆Ha, ∆Sa and ∆Ga) of urease in loamy sand and silty clay soils treated with different sources of organic residues (cow residue, alfalfa leaves, wheat straw and poultry residue). Residues were mixed with soil at rate of 2%. T...
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Published in: | Iraqi journal of agricultural science 2019-01, Vol.50 (3), p.783-792 |
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Main Authors: | , , |
Format: | Article |
Language: | ara ; eng |
Subjects: | |
Online Access: | Get full text |
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Summary: | An experiment was conducted to study the thermodynamic parameters (Q10, Ea, ∆Ha, ∆Sa
and ∆Ga) of urease in loamy sand and silty clay soils treated with different sources of organic
residues (cow residue, alfalfa leaves, wheat straw and poultry residue). Residues were mixed
with soil at rate of 2%. The amended soils were incubated at 30°C for 30 days to undergo
biochemical, chemical and physico-chemical reaction. Amended soils were incubated at 10, 20,
30, 40, 50, 60, 70 and 80°C. Urease activity was assayed and thermodynamic parameters were
calculated. Results indicated that urease activity of amended soil was higher than that of
control soils at various temperatures of incubation. Urease activity increased by increasing
temperature of incubation from 10 to 40°C. Q10, Ea, ∆Ha, and ∆Sa values of silty clay soil
were in the order of : poultry manure > cow manure > alfalfa residue > wheat residue >
control soil. However, in loamy sand soil the order was cow manure > alfalfa residue > wheat
residue > control > poultry manure. Order of ∆Ga was control > wheat residue > alfafa
residue > cow manure > poultry manure at both soils. Except at poultry manure, all
thermodynamic parameters values were higher in loamy sand soil as compared with their
values in silty clay soil. |
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ISSN: | 0075-0530 2410-0862 |
DOI: | 10.36103/ijas.v50i3.695 |