EFFECT OF POTASSIUM IN MITIGATING ADVERSE EFFECT OF SALT STRESS ON GROWTH, DEVELOPMENT AND YIELD OF RICE PLANT (Oryza sativa L.)

Abstract

A pot experiment was conducted at the net house of the Department of Agricultural Botany, Sher-e-Bangla Agricultural University, Dhaka-1207, during Boro rice cropping season of the year of 2017-18 to observe the effect of potassium in mitigating adverse effect of salt stress on growth, development and yield of rice plant (Oryza sativa L.). The experiment was conducted using two salinity levels with potassium viz. S 0 = Control, S 1 = 4dSm -1 salt, S 1 K 1 = 4dSm -1 salt + 80 ppm potassium, S 1 K 2 = 4dSm -1 salt + 160 ppm potassium, S 2 = 6 dSm -1 , S 2 K 1 = 6 dSm + 80 ppm potassium, S 2 K 2 = 6 dSm -1 + 160 ppm potassium. The experiment was conducted in Randomized Complete Block Design (RCBD) having one factor with three replications. The results and the effect on morphological characters indicated that all parameter were influenced by salinity and potassium. Among 3 salinity level (0, 4 & 6 dSm -1 ), the damaging effect was found more in higher stress (6 dSm ).But potassium supplementation along with salt greatly reduced the damaging effect of salt. Out of the 2 levels of potassium 160 ppm potassium significantly reduced the damaging effect of salt. Therefore, for cultivation of BRRI dhan67 under saline condition 160 ppm potassium application could be a better practice for getting higher yield.