作物と雑草との競争II : オカボの播種期と雑草害との関係

概要

論文の詳細を見る
The authors (1953) reported on the weeding effects to Oryza sativa var. terrestris, especially regarding the suitable time of weeding. In this paper the mutual influences between the same crop and weeds concerning the time of sowing and weeding based on the randomized blocks of three recapitulations (Fig. 1) are discussed. The flora and life-forms of weeds in the plots (Tables 1,2) are of a typical early stage of the secondary succession. The homogeneity and dominance (Tables 3〜6) show the growth of weeds as C>B>A. In the culture of the upland rice (Tables 7〜10,Fig. 2), the later the sowing time is, the better the germination and growth are. However the difference of the growth according to the sowing time decreases in a short time, and the yield shows the tendency of A>B>C in each weeding treatment. That the yield of the plot 2 is larger than that of the plot 1 in the treatment A suggests that the weeds may influence beneficially the yield at certain density. The weeds existing for an equal period in the farmland have a greater harmful effect against the crop as the sowing time is delayed.
日本生態学会の論文
1962-06-01