『Abstract
We studied the effects of poultry manure and pistachio compost
with and without phosphorus fertilizer on the kinetics of phosphorus
desorption in two calcareous soils of Kerman and Koohbanan farms
in the southeastern of Iran. For this purpose mono potassium phosphate,
at rates of 0, and 100 parts per million of phosphorus, and air-dried
manure, at rates of 0 and 4 % were mixed with the soils. The soils
were incubated at 24-25℃ and near field capacity for 90 days in
the greenhouse. Afterwards, the desorption of P was studied by
the successive extraction with 0.5 M NaHCO3.
The results of this research indicated that application of OM
and fertilizer P combined increased P recovery in each of the
extraction time, adding poultry manure and 100 mg phosphorus together
to the soils, increased P desorption more than pistachio compost
in the soils. The phosphorus desorption rate was initially rapid
and then became slower until equilibrium was approached. Kinetic
data were best described by power function and simple Elovich
equations. Subsequent to these equations, parabolic diffusion
equation was also well fitted the time-dependent P desorption
data.
Keywords: Phosphorus; Desorption; Kinetics equations; Organic
matter』
Introduction
Materials and methods
Organic matter characteristics
Treatments
Incubation study
Statistical analysis
Results and discussion
P fertilizer application on release of P
Organic matter and kinetics of P desorption
P fertilizer with organic matter application on release of P
Kinetic equation
Conclusion
Acknowledgments
References