ROLE OF MAGNESIUM TO ALLEVIATE DAMAGING EFFECT OF SALINITY ON DEVELOPMENT AND YIELD PERFORMANCE 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 2017-2018 to investigate the role of magnesium to alleviate damaging effect of salt stress on development and yield performance of rice plant (Oryza sativa L.). The experiment was conducted using two salinity levels with magnesium viz. S 0 = Control, S 1 = 4 dSm -1 salt, S 1 Mg 1 = 4 dSm -1 salt + 80 ppm magnesium, S 1 Mg 2 = 4 dSm -1 salt + 160 ppm magnesium, S 2 = 6 dSm = 6 dSm -1 salt + 80 ppm magnesium, S 2 Mg 2 = 6 dSm -1 salt + 160 ppm magnesium. The experiment was set in Randomized Complete Block Design (RCBD) having one factor with three replications. The results on the effect of morphological and yield contributing characters indicated that plant height; numbers of tillers, leaf length, leaf breath, and SPAD value, effective tiller, number of non effective tiller, panicle length and filled grain, unfilled grain, thousand seed weight grain yield were influenced by salinity and magnesium. Among the 3 salinity level (0,4 & 6dSm -1 ), the damaging effect was found more in higher stress (6dSm -1 salt).But magnesium supplementation along with salt greatly reduced the damaging effect of salt. Out of 2 level of magnesium, 160 ppm magnesium Significantly reduced the damaging effect of salt. Therefore, for cultivation of BRRI dhan67 under the saline condition magnesium application could be a better practice for getting higher yield.

. -1 salt, S 2 Mg 1