EFFECT OF SUPPLEMENTAL IRRIGATION ON THE PERFORMANCE OF TRANSPLANTED AMAN RICE

Abstract

An experiment was carried out to evaluate the effect of supplemental irrigation on performance of T. aman rice varieties at the Crop Physiology and Ecology Research Field, Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur during the period from July to November 2018.The experiment was laid out in a split plot design with three replications. The experiment comprised of two sets of treatments such as: Main plot treatment: Two water regimes (Rainfed condition and supplemental irrigation condition) and Sub-plot treatment: Four rice varieties (BRRI dhan56, BRRI dhan62, BRRI dhan71 and BRRI dhan72). Half of the plots were exposed under rainfed condition and the remaining half plots were irrigated at 60 and 75 days after transplanting. Data were collected on plant height, number of leaves hill-1, number of tillers hill-1 , SPAD value at different days after transplanting, leaf area, number of filled and unfilled grains per panicle, panicle length, 1000-grain weight, grain and biological yields. All the growth and yield contributing characters and yield of all T. aman rice was increased due to application of supplemental irrigation over rainfed condition. Among the varities significantly higher plant height, leaf area, leaf dry weight, tillers hill-1, filled spikelets per panicle and panicle length due to supplemental irrigation were contributed to higher yield in BRRI dhan56 and BRRI dhan71.