EFFECTS OF WATER MANAGEMENT PRACTICES ON ARSENIC AND CADMIUM ACCUMULATION IN RICE PLANT

Abstract

The experiment was conducted at Hajee Mohammad Danesh Science and Technology University, Dinajpur from December 2016 to June 2017. The experiment consisted four water management practices viz. T1= Conventional method (Flooding), T2= Shallow Water Depth (SWD), T3= Aerobic condition (Unsaturated), T4= Alternate Wetting and Drying (AWD). The experiment was laid out in Randomized Complete Block Design (RCBD) with five replications. Different water management practices influenced significantly on most of the parameters. Among the water management practices T1 and T4 performed best in plant height, number of tillers, number of effective and ineffective tillers and panicle length, days to panicle initiation, no of grain per panicle, no of filled and unfilled grain per panicle and 1000 grains weight and lowest result was observed from T3. Maximum grain yield was obtained from T1 (7.5 t ha-1 ) and T4 (7.3 t ha-1 ). Maximum biological yield was obtained from T1 (16.7 t ha-1 ) whereas minimum grain yield (5.6 t/ha) was observed in T3. Minimum content of Cd (0.02 mg Kg-1 grain, 0.12 mg Kg-1 straw) and As (0.013 mg Kg-1 grain, 0.25 mg Kg-1 straw) was found in T4 and maximum content of Cd (0.053 mg kg-1 grain, 0.23 mg Kg-1 straw) and As (0.036 mg Kg-1 grain, 0.53 mg Kg-1 straw) was found in T1