AMELIORATION OF SALT STRESS IN AROMATIC RICE BY APPLICATION OF DIFFERENT ORGANIC MANURES

Abstract

A pot experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka during the period from July to December 2020 to ameliorate the salt stress in aromatic rice by application of different organic manures. The two factor experiment was conducted by following RCBD design with four replications. Factor A consisted three NaCl levels viz; S 0 = 0 ppm pot -1 (Control), S 1 ii = 1200 ppm pot -1 and S 2 = 2400 ppm pot -1 and Factor B consisted five types of organic manures viz M 0 = No organic manure (Control), M 1 = Biochar 4 t ha -1 , M 2 = Vermicompost 6 t ha -1 , M 3 = Azolla 0.5 t ha -1 and M 4 = Cowdung 10 t ha -1 . Result revealed that salinity decreased plant height, leaf number, tiller number, LAI, SPAD value, RWC, grain yield and other yield attributes. Exposer of 1200 ppm and 2400 ppm NaCl decreased grain yield by 7 and 16% in Binadhan-13 compared to control by decreasing effective tillers. Application of different organic manures such as Biochar, Vermicompost, Azolla and Cowdung significantly influences growth and yield of aromatic rice. Vermicompost application (6 t ha -1 ) recorded the highest number of effective tillers hill (10.40), filled grains panicle -1 (98.83), grain yield (25.25 g pot -1 -1 ), straw yield (94.09 g pot ), biological yield (119.35 g pot -1 ) and harvest index (21.12 %). Different types of organic manures application under NaCl stress condition recovered growth and yield loss of aromatic rice. Among the organic manures Vermicompst gave highest grain yield in all stresses viz S 0 M 2 (28.15 g pot -1 ), S 1 M 2 (24.45 g pot -1 ) and S 2 (23.15 g pot -1 ) comparable to others treatment combinations. So, it might be concluded that, the growth and yield of rice decreased with the increasing dose of salt and application of different organic manures recovered growth and yield of rice by ameliorating salt stress. However, application of Vermicompost might be the best approach to reduce salt-induced damages in rice.