INFLUENCE OF VERMICOMPOST AND INORGANIC FERTILIZERS ON MITIGATION OF ARSENIC STRESS IN BRRI dhan47

Abstract

An experiment was conducted in the net house and the agro-environmental chemistry laboratory of the Department of Agricultural Chemistry, Sher-e-Bangla Agricultural University, Dhaka-1207 during the Boro season of the year 2016-17 to evaluate the influence of vermicompost and inorganic fertilizers on the mitigation of arsenic stress in BRRI dhan47. The two factorial experiment was laid out in a Completely Randomized Design (CRD) with three replications. Factor A: different doses of arsenic on soil weight basis [As 0 =No arsenic applied, As 1 = 10 ppm arsenic, As = 20 ppm arsenic, As = 30 ppm arsenic] and Factor B: different doses of vermicompost and inorganic fertilizers [T 3 = Recommended doses of vermicompost + inorganic fertilizers, T 1 o = Recommended doses of inorganic fertilizers without vermicompost, T 2 = Recommended doses of vermicompost without inorganic fertilizers, T = Reduction of 40% of recommended doses of inorganic fertilizers + Addition of vermicompost to supplement the reduction of inorganic fertilizers, T = Reduction of 60% of recommended doses of inorganic fertilizers + Addition of vermicompost to supplement the reduction of inorganic fertilizers]. Arsenic was added from Sodium Arsenate (Na 2 HAsO 4 .7H 2 O). In case of fertilizers, T gave higher results in most growth, yield and yield contributing parameters (height, tiller number, effective tiller, filled grain, 1000 grain weight, grain and straw yield) and T 2 gave lower results; whereas for arsenic, maximum results were recorded from As 1 and minimum from As 3 . In interaction, As 0 T 2 produced higher results and As 3 T 1 0 produced lower results in most cases. The treatment T gave higher N, P and K content in grain, straw and root whereas, T 1 2 gave lower content; highest As content by T 1 4 and lowest by T . In case of arsenic content in grain, shoot and root, maximum results were recorded from As and minimum from As . In interaction, the maximum N, P and K content in grain, straw and root were found in As 0 0 T 2 and the minimum were observed from As treatment; whereas, highest As by As 3 T 1 and lowest by As 0 T 0 3 T 2 1 . Therefore, the treatment T

showed lower arsenic in grain, shoot and root and T 1 showed the highest content.