EFFECTS OF DIFFERENT LEVELS OF ARSENIC ON GROWTH, YIELD AND NUTRIENTS CONTENT OF BR-14, BRRI dhan58, BRRI dhan67, BRRI dhan88 AND BRRI dhan92

Abstract

An experiment was conducted from November 2020 to April 2022 to study the effect of arsenic on the growth, yield and nutrients content of five boro rice varieties viz. V 1 (BR-14), V 2 (BRRI dhan58), V 3 ii (BRRI dhan67), V 4 (BRRI dhan88), and V 5 (BRRI dhan92) which were comprised of five arsenic treatments viz. As 0 (20 ppm), and As 4 (control; no arsenic added), As 1 (2 ppm), As 2 (40 ppm). In case of single effect, the maximum growth (plant height, leaf length, leaves number, total tillers number) were found in V 3 (BRRI dhan67) variety whereas minimum growth parameters for plant height and leaf length were found in V 5 , for leaves number V 4 and total tillers number were found in V 2 . The control treatment As 0 (no arsenic) gave the maximum growth that was decreased by increasing of As level. Maximum yield parameters number of grains, number of filled grains, thousand grain weight and grain yield were found in V 2 variety whereas minimum yield parameters (panicle length, number of panicle) were found in V 5 but maximum straw yield was observed in V 1 variety. The control treatment As 0 (no arsenic produced) gave the maximum yield, which was decreased by increasing of As level. In case of combined effect maximum plant height, number of grains per panicle, number of filled grains per panicle, thousand grain weight and grain yield were found from V 3 As 0 treatment whereas maximum straw yield obtained from V 1 As 0 . P and K content decreased with increasing arsenic level but S and As content showed opposite trend. Maximum arsenic content was observed in V 4 As 4 treatment whereas minimum in controlled treatment. But considering everything it can be concluded that V 2 (BRRI dhan 58) performed best in terms of grain yield and As effect.