圃場におけるタイヌビエの生育とピペロホス・ジメタメトリン粒剤の効果

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The relationships between the growth of barnyardgrass (Echinochloa oryzicola Vasing.) in paddy fields and irrigation times and periods after irrigation were investigated for 4 years (1979〜1975) to obtain fundamental knowledge available for control of barnyardgrass. The variation of growth gtage in mean value was also investigated, and then the influence of the variation against the effect of a granular formulation of CG102 C4.4% (w/w) piperophos plus 1.1% (w/w) dimethametryn] was studied. 1. The growth rate of barnyardgrass was different in time of irrigation, that is, the later the paddy fields were irrigated in the ordinary rice-transplanting season, the faster barnyardgrass grew in the same period after irrigation. On the other hand, standard deviations in values of the leaf-stage and plant height of barnyardgrass were almost the same at the same leaf-stage and plant height without relation to the irrigation time. 2. There were high positive mutual relations between the leaf-stage or the plant height of barnyardgrass and the accumulated temperatures after irrigation. The full expansion of the second and further leaves was necessary for 98.3℃ as the accumulated average temperature. But that of the first leaf required 214.9℃. 3. The dry shoot weights of barnyardgrass increased exponentially for the leaf-stage and the relation between the logarithms of dry shoot weights (Y) and the leaf-stage (X) in mean value was expressed by the equation, Y=0.4704X-0.3877 with a high coefficient of correlation, +0.995 between X and Y. 4. Although CG 102 showed the execllent effect on the barnyardgrass of 2.3-leaf stage in means, the effect on the plant of 2.4-leaf stage in means which included the plants with 3.1 to 3.5 leaves about 7 times as much as those of 2.3-leaf stage was reduced.
日本雑草学会の論文
1978-06-25

圃場におけるタイヌビエの生育とピペロホス・ジメタメトリン粒剤の効果

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