Nitrogen Availability in SAT Soils: Environmental Effects on Soil Processes uri icon

abstract

  • In the past, fertilizer needs of crops in India have been assessed by conducting numerous fertilizer response experiments. Recent advances in crop modeling have led to suggestions that the models based on physical environmental factors may be extended to include descriptions of nutrient behavior. One difficulty in this approach is the harsh environment of the semiarid tropics (SAT) and the effect of this environment on processes affecting nitrogen availability in the soil. Another constraint is the dearth of direct measurements and quantitative descriptions of many processes in the field (e.g., mineralization, urea hydrolysis, leaching, denitrification, and ammonia volatilization). Such measurements are urgently needed, with appropriate attention to methodology, to provide information needed for models that include nutrient terms

publication date

  • 1988