1. Integrated nutrient management in drylands;Aggarwal,1995
2. Ammonia volatilization losses from urea and their possible management for increasing nitrogen use efficiency in an arid region;Aggarwal;J. Arid Environ.,1987
3. Mineralization and immobilization of nitrogen;Alexander,1977
4. Official methods of analysis,1950
5. Denitrification in soils: I. Methods of investigation;Bremner;J. Agric. Sci.,1958