. Conclusions
With the rotor blades cutting upwards, the tilled
soil was scattered out of the seeding furrow and a
seedbed was not formed. A down-cut process is there-
fore necessary for effective seedbed preparation of a
rice field by strip tillage using a rotary tiller. Among
the three types of rotary blade tested, the rotary blade
for the power tiller was considered to be optimum
for strip tillage on the direct seeder having the low