水稲の作期および品種の差異とウリカワ,ミズガヤツリの増殖ならびに雑草害

概要

論文の詳細を見る
Growth of Sagittaria pygmaea Miq. and Cyperus serotinus Rottb., and their influences on rice were investigated in field experiments, in which each of three rice cultivars different in maturing time were transplanted at two different dates (early and normal planting). Sprouted tubers of each of the weeds were transplanted between rice rows at the density of 22.2 tubers per m^2. In early planting of rice. S. pygmaea propagated most vigourously in early maturing cultivar of rice and reached to more than 1100 stands per m^2 by autumn. The number of formed tubers were almost proportional to the stands of S. pygmaea. More aerial shoots of C. serotinus were emerged in early planting than in normal planting of rice, although there were not marked differences in propagation of C. serotinus between rice cultivars. Formation of tubers was influenced by harvesting time of rice. While growth of rice infested with S. pygmaea was little affected, C. serotinus influenced seriously on LAI, dry matter production and CGR of rice since tillering stage and reduced panicle number and grain yield of rice in all plots.
日本雑草学会の論文
1979-10-25