1. Methods of soil Analysis;Black,1965
2. Inorganic forms of nitrogen;Brcmncr,1965
3. Soil dehydrogenase activity;Casida;Soil Sciences,1964
4. Soil microbial and biochemical changes associated with reduced tillage;Doran;Soil Science Society of America Journal,1980
5. Transformation of organic matter in soil in relation to mineralization of carbon and nutrient availability;Debnath;Journal of Indian Society Soil Science,1972