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Volume 2
Journal of Environmental Research
Page 83
JOINT EVENT
July 26-27, 2018 Rome, Italy
&
6
th
Edition of International Conference on
Water Pollution & Sewage Management
4
th
International Conference on
Pollution Control & Sustainable Environment
Effect of organic amendments on phosphorus sorption isotherm in some calcareous fertilized soils
Mahboubeh Zarrabi
and
Fatemeh Bagvand
University of Malayer, Iran
I
n order to enhance crop production in arid and semi-arid regions, high amount of phosphorous (P) fertilizer and organic
amendments (OAs) together are added to soils. Addition of OAs to P fertilized soil may alter P sorption and availability in
soil. The high P concentration in soil solution can increase movement of P from soils to surface water increasing eutrophication
of water. In order to study the effect of OAs with different ranges of total P and C/P ratios, Phosphorus sorption isotherm was
investigated in five P fertilized calcareous soils treated with four types of OAs (vermicompost, grape waste, poultry and sheep
manure) at rate of 20 g kg
-1
for one month. Isotherm experiment in control (not treated) and treated soils were carried out by
concentrations of P range from 0 to 200 mg l
-1
in the presence of 10 mm CaCl
2
. Sorption isotherms were characterized using
Freundlich, linear and Langmuir equations. The grape waste had the highest (350) and vermicompost the lowest (15) C:P ratio.
Average concentration of available P in control and treated soil with vermicompost, grape waste, poultry and sheep manure
was 25.9, 628.4, 495.0, 553.3 and 577.1 mg kg
-1
, respectively. Phosphorus sorption curves were well fitted to the Freundlich
equation. Kf and an average values were in the following order: control > grape waste > poultry manure > vermicompost >
sheep manure. The SPR (standard P requirement) average of control and treated soil with vermicompost, grape waste, poultry
and sheep manure was, 121.3, 11.0, 14.5, 12.8 and 9.3 mg kg
-1
, respectively. There was positive correlation between SPR with
CEC and ECC percent of treated soils. Our study indicated that OAs with low C:P ratio and high total P had an important role
in the sorption of P in calcareous soils.
mzarrabi@malayeru.ac.irJ Environ Res 2018, Volume: 2