Soil Sciences Department;
College of Food and Agricultural Sciences;
King Saud University;
Department of Soil Science;
Faculty of Agriculture;
Ain Shams University;
Department of Soils and Water;
Faculty of Agriculture;
Assiut University;
Industrial Psychology;
College of Education;
King Saud University;
Chemical and Environmental Systems Modeling Research Group;
Institute of Fundamental Studies(Sri Lanka);
Agriculture Engineering Department;
College of Food and Agriculture Sciences;
King Saud University;
phosphorus; availability; phosphorus; fraction; poultry; manure; sequential; extraction; soil; pH;