Abstract

                                A field experiment was carried out during the rabi seasons on 1996-97 and 1997-98 to study the sustainability of rice cv. White ponni to green manuring and N and K levels. The grain and straw yields obtained from green manuring along with the application of 50 per cent of the recommended N and K and application of 100 per cent N and K applied alone were on par with each other. Agronomic efficiency of the applied N and K were higher in green manuring with 50 per cent of the recommended N and K. However, non-green manured treatments recorded higher physiological efficiency than green manured treatments. The treatments with green manuring registered positive nutrient balance compared to non-green manuring.

Key words : Green manuring, Agronomic efficiency, Physiological efficiency, Nutrient balance.