畑作における麦類の自生作物化と作付体系に関する研究 ＶＩ 揺動選別機による自生コムギ粒混入オオムギの選別特性

Abstract

We investigated the separating characteristics of rough rice separaters to contaminated barley grains by mixing of volunteer wheat grains.A principal factor in separation by rough rice separater was the difference ratio of grain length. So the difference ratio of grain length for barley and volunteer wheat grain were 1:0.78.The performance of a rough rice separater for removing volunteer wheat grain from barley grain was poor, when separating the rice from the chuff. When the pan oscilation was 160rpm and pan slope, 16°, the rough rice separater efficiently removed volunteer wheat grain. So barley grain had met the standerd requirements at inspecting.Then Newton's efficiency was 0.7. But thirty percent of the barley grain were discharged with wheat grain.This operation was an emergency measure of prevention against the contamination of barley grain by mixing of volunteer wheat grain. Because barley grain loss on separating by rough rice separater resulted from falling in shipment of barley.