Consequence of salinity on biological yield, grain yield and harvest index in rice ( Oryza sativa L.) cultivars.

摘要

This paper are evaluate salt stress impact on yield related parameters of rice cultivar, an experiment conducted using RBD with three replications. Salinity could not effect on tiller number, while flag leaf area significantly affected during grain filling stage. Among studied traits, genotypic correlation coefficient grain yield per plant showed highly significant positive correlation coefficient with biological yield followed by harvest index. Grain yield per plant showed highly significant and positive correlation with harvest index fallowed by biological yield at phenotypic level. Salt stress induced a linear decrease in biological and paddy yield and total plant biomass, whereas a second degree equation was existed for harvest index. The highest positive direct effect on grain yield per plant was exhibited by harvest index exhibited that biological yield per plant and grains per panicle (0.159) at phenotypic level and highest positive direct effect on grain yield per plant were recorded by grains per panicle revealed by biological yield per plant and harvest index at genotypic level. In case of rice is moderately resistance to salinity and great degree of genotypic variation is found, hence, it is possible to develop varieties with enhanced salt tolerance if appropriate strategies and advanced techniques are adopted.