磁性材料の化学 土壌改良材に超微粒フェライトを混合した資材による芝草雪腐病防除の効果

Abstract

In cultivating biennial produce such as pasture, wheat, turf, etc., in snow-inflicted areas such as Hokkaido or part of Honshu, snow mold brought about by the causes including typhuna ishikariensis is known as a serious obstacle. Although agricultural chemicals have conventionally been used as a principal measure for elimination of snow mold, danger of environmental pollution manifests itself as a problematic point. To solve the problem referred to above, a suspension of ultra-fine ferrite (200-300A) was made paying attention to the behavior of an electromagnetic field. The suspension obtained in this manner was sprinkled at a ratio of 1g/m2 in the in room and on-the-spot tests, which made it possible to restrict the bacillus movement. On the other hand, concurrent employment of the suspension with agricultural chemicals made it possible to reduce the chemicals to the extent of almost 1/2 of the amount before the use. However the ferrite in a state of ultra-fine substances is so hard that the nozzle to be used for sprinkling the solution comes to be worn away, when a suspension is sprinkled. With a view to avoiding such trouble, the ultra-fine ferrite was mixed 1%-10% with a soil improvable materials. By agitating the said mixture, sprinkling becomes possible without any rectification. It is explained that sprinkling of the mixed solution in this manner helps restrict snow mold movement as with the case of suspension. Concurrently with this, it is also explained that growth of turf is promoted.