1. Chemical analysis;Allen,1986
2. Soil Organic Matter and Its Role in Crop Production;Allison,1973
3. Prevention of Food Adulteration Act no. 37 of 1954. Central and State Rules as Amended for 1999;Awashthi,2000
4. Effects of municipal sewage sludge and humic acid applications on nutrient and heavy metal concentrations of corn;Bozkurt;A.Ü. Tarm Bilimleri Derg.,2000
5. Effect of wastewater sludge and woodchip combinations on soil properties and growth of planted hardwood trees and willow on a restored site;Cogliastro;Ecol. Eng.,2001