“…Abrams and Frey (1964) reported that genetic variability generated for plant height and heading date in oats by thermal 32 neutrons, P and EMS was unidirectional from the check mean with the mutants being later and shorter. Okabe et al» (1963) showed that the mean seed weight (primary as well as secondary) of a neutron-derived population of oats was significantly higher than the mean of control population.…”