IMPACT OF BIOCHAR ON T. AMAN RICE UNDER LEAD (Pb) STRESS CONDITION

Abstract

The present study was conducted in net house of Sher-e-Bangla Agricultural University during July to December 2018 to understand the role of biochar under Lead (Pb) stress condition. Different levels of lead chloride(PbCl 2 ) (0, 75 and 150 mg kg ‒1 ) was applied to understand the effect of Pb on T. amanrice (BRRI Dhan62) and different doses of biochar (0, 2, 4 and 6 t ha ‒1 ) was applied for reducing Pb toxicity in rice plant. This experiment was laid out in completely randomized design with four replications. Exposure of Pd decreased growth of aman rice by decreasing plant height, tiller number, leaf number, leaf area index, root length and root weight. External application of 75 and 150 mg kg ‒1 of PbCl 2 decreased effective tillers (12 and 25%, respectively), number of grain (8 and 21%, respectively), grain yield (12 and 30%, respectively) and straw yield (4 and 12%, respectively). Addition of different doses of biochar influenced growth and yield attributes. Growth and yield of rice increased with increasing the doses of biochar upto a certain extent (4 t ha ). Application of 4 t ha ‒1 of biochar in amanrice increased grain yield by 15%. However, application of different doses of biochar have no impact on riceunder Pb stress conditions.