EFFECT OF SUPPLEMENTAL IRRIGATION AND MANURING ON PERFORMANCE OF BRRI dhan103 UNDER TERMINAL DROUGHT CONDITION IN AMAN SEASON

Abstract

An experiment was conducted at Crop Physiology and Ecology Research Field, Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur during August to November 2023 to find out the effect of supplemental irrigation and manuring on performance of BRRI dhan103 under terminal drought condition in Aman season. Rice variety BRRI dhan103 was used as planting material, The experiment was laid out in randomized complete block design with seven treatments and three replications. The treatments were, T1: Rainfed (control), T2: One supplemental irrigation at 80 DAT, T3: Two supplemental irrigation at 70 DAT and 80 DAT, T4: Additional 5 t ha-1 poultry compost, T5: Additional 10 t ha-1 poultry compost, T6: Additional 2.5 t ha-1 biochar and T7: Additional 5 t ha-1 biochar. The total number of plots was 21 and the size of unit plot was 2 m × 2 m. The performances of Aman rice in relation to plant height (cm), tillers hill-1, leaves hill-1, SPAD values, shoot and root dry weight as well as yield and yield contributing parameters such as panicles hill-1, filled grains panicle-1, grain weight panicle-1, thousand grain yield (g) and grain yield hill-1 were measured. All the growth parameters such as plant height, tillers hill-1, leaves hill-1, leaf SPAD value at 50 70 and 90 days after transplanting were enhanced significantly due to supplemental irrigation and manuring treatments. Yield attributes (panicles hill-1, filled grains panicle-1, thousand grain weight and grain yield hill-1 as well as grain yield m-2 of BRRI dhan103 was increased due to different supplemental irrigation and manuring treatments compared to rainfed control. The increment in grain yield m-2 was 7.27% in one supplemental irrigation, 18.41% in two supplemental irrigations, 27.04% in additional application of 10 t ha-1poultry compost, 15% in additional application of 5 t ha-1 poultry compost, 25.91% in additional application of 5 t ha-1 biochar and 11.81% in additional application of 2.5 t ha-1 biochar. The results of the present investigation indicated that growth, yield attributes and yield of BRRI dhan103 was affected due to terminal drought stage in Aman season. Two supplemental irrigations could effectively alleviate the adverse effect of terminal drought stage and additional application of poultry compost both at the rate of 5 and 10 t ha-1 and additional application of biochar at the rate of 5 t ha-1 was found effective for alleviating the adverse effect of terminal drought stage in T. Aman.