Incompletely closed glumes, germ on panicle and disease are three characteristics of hybrid rice seed, which are
actual reasons of poor seed quality. To find how many and which categories should be classified to meet the demand of
produce actually, the effects of various degree of incompletely closed glumes, germ on panicle and disease on ratio of
germination in changed storage periods were studied with standard germination rate test. An electronic scanning
microscope was used for micro-observation and measurement. Then the possibility of automation inspection was tested
with a machine vision system. The measures of increasing quality of hybrid rice seed were discussed in the paper at last.
In the light of the periods of treatment and the classification of characteristics, difference steps should be taken. Before
storage, Seeds with germ or severe disease should be rejected at first. Then seeds with incompletely closed glumes or
spot disease might be stored separately for a shorter time in dried condition and treated with antisepsis before using for
some special fields with lower quality demand. The seeds with fine fissure between glumes should be stored in a strictly
controlled condition separately and inspected before use, just like other normal and healthy seeds.