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 ＩＩ 自生コムギの発生事例と耕うんによる防除について

Abstract

We had investigated an actual growth of volunteer wheats in barley field, and have conducted a field experiment on the control of volunteer wheat by different tillage methods.The results obtained were as follows.1) Ninety six hills of volunteer wheat per 10 a were observed in the barley field.Eighty five percent of volunteer wheat grains harvested were grain size of >2.5mm, which could not separate from the barley grains by use of grader.2) Emergence depth of volunteer wheats grown in the barly field were distributed in the soil surface layer less than 5cm depth.3) Emergence times of volunteer wheats showed the varietal differences, as low rate in summer and high rate in fall for the varieties which need long term after-ripening.4) Volunteer wheats did not grow in either plot where plow-till in summer followed by rotary-till in autumn, and where plow-till in summer and no till in autunm.