Effects of planting date and post emergence herbicide on mungbean seed quality and seed storability of different mungbean cultivars
1993
Wanchai Chanprasert | Pitchaya Rujirawat | Ungsana Wongsathan (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Effects of planting date and weed control by post emergence herbicide (imazethapyr 5 percent ai.) on mungbean seed quality and observations on seed storability of different mungbean cultivars were separately experimented. The results of planting date experiment showed that mungbean seeds of April to October 1989 planting dates were poorer in quality than seeds of March, November and December 1989 planting dates due mainly to the weathering effects during seed development and maturation in the field. For the effect of weed control on mungbean seed quality, seeds harvested from uncontrol weed plots showed lower germination than seeds harvested from plots treated with post-emergence herbicide (imazethapyr) at the rate of 400 or 800 ml/rai. High competition between crop plants and weeds may cause a poorer food reserves in mungbean seeds from uncontrolled plots resulting in a poorer seed germinability. Poor ventilation and high humidity in the crop canopy of uncontrolled weed plots was suspected to be one of the causes. For the seed storability study, the 5 mungbean cultivars studied i.e. Uthong 1, Kamphaeng Saen 1, Kamphaeng Saen 2, Chainat 60 and PSU 1 maintained their seed germinabilities up to 7 months under ambient conditions with germination percentages higher than 90. There were no significant differences between cultivars in this study. Seed vigour measured by accelerated aging test and electrical conductivity test was decreased rapidly after 3 months of storage.
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