Determination and Application of Physical Characteristic Parameters of Wheat Seeds in Design of Plot Precision Seeder

In order to obtain design basis of precision seeder metering device and automatic seed supply device in wheat plot，Ji-mai 22 seeds were selected as measurement object at early stage of research.Physical parameters such as 1000-grain weight，volume weight，triaxial size，angle of repose and static friction coefficient of seeds were measured.Average 1000-grain weight of Ji-mai 22 seeds was 46.02 g.Average volume weight was 831.30 g/L.Mean values of long，medium and short axes of triaxial size were 6.47，3.42 and 3.08 mm，respectively.Mean angle of repose was 28.9°.Static friction coefficient between wheat and stainless steel plate was the smallest，which was 0.427.Determination of above parameters provided a strong data support for determination of relevant parameters of seed metering device and automatic seed supply device of precision seeder in wheat plot，and improved working performance of whole machine to a certain extent.