Abstract
A small-sized lotus-roots harvester using a stationary water pump was built with the object of being adapted for individual farm use and its performance was tested. The results were summarized as follows,
1. This machine could be used on the drained field with water supplied through a long hose by a pump fixed on border levee or farm road. The main parts of this machine consisted of two nozzles arranged in front and rear doing the fan-shaped reciprocating motion and self-traveling device.
2. In order to harvest lotus-roots perfectly, the required momentum of water jet per unit area was more than 3, 000kg·s/m2 as was in I-type trial machine, but the value could be decreased up to 2, 000kg·s/m2 by adding hand pulling.
3. In order to keep lotus-roots from broken loss under the constant momentum of water jet, it was advantageous to arrange nozzles in front and rear.
4. This machine harvested lotus-roots at the rate of 0.25a per hour, which was about 3 times as much as that by hand.
