Effect of nitrogen levels on growth and yield of rice [SSRC 91216 (TRY 2)] under sodic soil conditions

摘要

Field experiments were conducted during Thaladi season (October-January) of 1998-99 and 1999-2000 on sodic tolerant short duration rice variety TRY 2 (SSRC 91216) with five levels of nitrogen (0, 75, 100, 125 and 150 kg ha~(-1)) to study the optimumlevel of N required to produce the maximum yield under sodic soil conditions. The results revealed that there was significant increase in plant height, leaf area index, drymatter production, panicle number, filled grains/panicle, straw and grain yields with an increase in the level of N from 0 to 125 kg ha~(-1). Further increase upto 150 kg N ha~(-1) did not show any significant increase in the growth and yield parameters observed. Application of 125 kg N ha~(-1) produced the highest grain yield of 5.15and 5.51 t ha~(-1) during 1998-99 and 1999-2000, respectively. Agronomic N use efficiency, nitrogen uptake at various growth stages were found to be maximum at 125 kg N ha~(-1).