Effect of ecofriendly chemicals on morphological and phenological characters of rice variety Uma under UV stress

摘要

Rice is staple food for all over the world. Nowadays the production and productivity of rice crop affected by changing climate especially to high temperature and high concentration of ultraviolet-B radiation. This study evaluated the photo protectivepotential of ecofriendly chemicals like glycine betaine, ascorbic acid and combination fungicide Nativo (25 WG trifloxystrobin+ 50 WG tebuconazole) with two different concentration under two levels of solar radiation which is 100 and 80% solar radiationto get two levels of UV-B radiation. From diurnal observations of PAR and UV-B radiation revealed that, both are gradually increased from 8am to 12pm. Treatment effect of this experiment showed that under 100% and 80% solar radiation all the chemical treatments recorded higher height and tiller number than absolute control. Among chemical treatments Nativo 70ppm could enhance the grain filling period up to 6 days compared to absolute control under both condition which contributed maximum grain yield, itmay be due to its ethylene inhibition capacity to decrease senescence and retain greenness in crops.