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

HIGH SOIL MOISTURE AT FLOWERING STAGE OF BORO RICE VARIETIES REDUCES HIGH TEMPERATURE EFFECT (Pages : 11 - 14)

Global climate change is making high temperatures a critical factor for plant growth and productivity. The flowering stage of rice is critical for high temperatures. Maintaining proper soil moisture level at this stage is very important to reduce yield loss. An experiment was carried out at BINA, Mymensingh, Bangladesh during December 2019 to May 2020 with three boro rice varieties. The objective of the study was to estimate proper soil moisture level at flowering stage to reduce high temperature effect. So, Binadhan-5, Binadhan-10 and Binadhan-14 were grown in pots each of 8 kg soil in ambient temperature and those were kept at 38°C at flowering stage for 24 hours under different soil moisture levels (80% FC, 100% FC and 2 inches standing water) in plant growth chamber. Then all the plants were again continued to maturity under sufficient soil moisture in ambient condition. The experiment was conducted in CRD with three replications. Data on photosynthetic parameters, yield and yield attributes were recorded. The results revealed that under high temperature photosynthesis, transpiration rate and yield significantly decreased but water use efficiency increased at 80% FC. Transpiration rate maintained T leaf of 33-34°C during T air of 38°C. Binadhan-5 and Binadhan-10 maintained lower leaf temperature than Binadhan-14. Better yield was found in 100% FC and standing water of 2 inches compared to 80% FC. So, maintain 100% FC or standing water of 2 inches at flowering stage of rice can reduce high temperature effect.Download