INFLUENCE OF SALINE WATER ON GROWTH AND YIELD OF RICE

Abstract

A pot experiment was conducted with two rice varieties viz. BRRI dhan28 and BRRI dhan47 in the experimental shed of Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka during boro season (2017-2018) to determine the effect of different level of salinity on rice and finding out the comparative performance of two varieties under salinity. Mixture of fresh water and marine water was used as salinity treatments. Four salinity treatments were used in this experiment viz. control S 0 (only fresh water), Quarter strength marine water S 1 (Three part fresh water and one part marine water), Half strength marine water S 2 (half fresh water and half marine water), Full strength marine water S 3 (only marine water). These mixtures were used for irrigation purpose throughout the life cycle. Salt stress significantly reduced plant height, number of tillers hill -1 , leaf relative water content, number of effective tillers hill , panicle length, number of filled grains panicle -1 , 1000 grain weight, grain yield , straw yield and biological yield but increased the number of non-effective tiller hill -1 and unfilled grain panicle . Leaf relative water content (RWC) also decreased due to salinity. With rise in salinity level adverse effect of salinity was more clearly visible. Different growth stages showed different sensitivity to salinity. In fact, the primitive growth stages, that is, tillering and panicle initiation showed more sensitivity to salinity than final growth stages (panicle emergence and ripening). Therefore, irrigation with saline water at the early growth stages has more negative effect on yield and its components. Between the two varieties used in this experiment BRRI dhan47 performed better than BRRI dhan28 under salinity stress condition.

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