Green Global
Foundation   Journal
...an emerging window for scientific research and publication across the globe

INDIVIDUAL AND COMBINED EFFECTS OF HIGH TEMPERATURE AND DROUGHT ON YIELD OF BORO RICE VARIETIES (Pages : 5 - 9)

Climate is changing and air temperature is rising due to increasing concentration of CO2 and other atmospheric greenhouse gases. The flowering stage of rice is important for high temperatures. An experiment was carried out at Bangladesh Institute of Nuclear Agriculture, Mymensingh, Bangladesh during December 2021 to May 2022 with three Boro rice varieties viz. Binadhan-8, Binadhan-10 and Binadhan-14 to find out proper soil moisture level at flowering stage to reduce high temperature effect. The rice varieties were grown in pots in ambient temperature. During flowering stage 50% plants were kept in plant growth chamber at 38oC for 24 hrs under different soil moisture levels (standing water of 2 inches, 100% FC and 80% FC) in pot soil. Then those plants along with the rest 50% plants were allowed to complete the maturity under sufficient soil moisture at ambient temperature. The experiment was conducted in RCBD with three replications. High temperature (36oC) increased the number of unfilled grains panicle-1 and decreased yield plant-1. The highest yield was found in Binadhan-8 followed by Binadhan-10 and Binadhan-14. Combined effect of high temperature and soil moisture showed that yield was significantly decreased with high temperature and soil moisture of 80% FC and 60% FC. Binadhan-8 produced the highest yield plant-1 with 100% FC or standing water of 2 inches and the lowest in Binadhan-14 with 60% FC. Yield and yield attributes of all the rice varieties were mainly affected by lower soil moisture rather than temperature. Binadhan-14 showed lower yield at 60 and 80% FC. Yield and yield contributing characters of the rice varieties were affected with 80 and 60% FC but not with 100% FC or standing water of 2 inches. So, maintaining soil moisture at 100% field capacity or standing water of 2 inches can reduce the high-temperature effect of the rice varieties at flowering stage.Download