The present work was conducted to study the inherent genetic variation existing among the
twenty four released & pre release cultures and use of these varieties as parents in
developing new rice varieties with increased yield potential suitable for irrigated ecosystem.
Principal Component Analysis revealed that first three principal components explained 83%
of variability existing in the rice genotypes for yield contributing characters and importance of
all the reproductive traits in selections for developing new rice cultures. The traits mother …

More than half of the world populations depend on rice for their survival. It plays a pivotal
role in food security of many countries. Rice crop is interwoven in the cultural and social life
of millions of Asian. Salinity and alkalinity are growing problems worldwide. It can either be
natural or primary or secondary or men made salinity. Primary salinity of soil and ground
water is due to the weathering of naturally saline rocks or by deposition of oceanic salt
carried by the wind and rain affects 130 m ha out of the global land area (Szaboles, 1994) …