EFFECTS OF SALINITY ON MINERAL CONTENTS IN STEM AND LEAF OF RICE CULTIVARS DIFFERING IN SALT TOLERANCE

Abstract

An experiment was conducted in pot culture to study the reclamation of salinity on yield and nutrient content of rice during the Roro season (December-June) of the year 2008-09 at Slier-e-Bangla Agricultural University. Dhaka-1207. The two factors experiment was completed using four varieties namely Pokkali, BR 28. BRRI dhan 29 and IR 29 with five salinity levels (0. 3. 6, 9 and 12 dSni). The N. P. K. Na, Ca and Mg contents into the stem and leaf of the rice varieties as well as their grain yield hill' were studied. Significant varietal differences were found in N. P. K. Na and Mg but Ca did not show any significant varietal difference. Grain yield hill4 also showed significant varietal differences. The salinity increased significantly the content of Na. Mg, N. P in stem & leaf of the selected rice varieties and K content significantly decreased under higher salinity levels. The N. Na. and Mg contents were highest at maximum level of salinity and it was lowest at control. P increased upto 6 dSnf' salinity level and then decreased. In both stem and leaf K content decreased with the increase of salinity and reached to the lowest value at the highest salinity treatment. Grain yield hill' decreased with increasing salinity level. Interaction effect of variety and salinity significantly changed the contents of N. P. K. Na and Mg in both stein and leaf. N was highest in BRRI Dhan 2931 9 dSm' & IR 29 at 12 dSnf' and lowest in Pokkali at 6 dSnf' & IR 29 at 3 dSm' in stem and leaf respectively. In case of P it was highest in IR 29 at 12 dSm' & BR 28 at 6 dSni' and lowest in BR 28 at 0 dSrn' & BRRI Dhan 29 at 3 dSm' in stem and leaf respectively. In both stem & leaf. Na content was highest in IR 29 at 12 dSrn t and lowest in Pokkali at 0 dSni'. While the K content was highest in Pokkali at 0 and the lowest in IR 29 at 12 dSm' in both stein and leaf Mg was highest in BRRI Dhan 29 at 9 dSm' & in BRRI Dhan 29 at 12 dSm' in stem and leaf respectively and the lowest in Pokkali at 3 dSm' in both the plant parts.