Effect of Application of Paclobutrazol ((2 RS, 3 RS)-1-(4-chlorophenyl)-4, 4-dimethyl-2-(1 H-1, 2, 4-triazol-1-yl)pentan-3-ol) on the Seasonal Variation in Emergence of Weeds in the Turfgrass Fields.

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Paclobutrazol was applied to retard elongation and growth of weeds in turfgrass field and its effect on elongation and growth of weeds were shown in Table 1 and 7. The weight of annual emergence of weeds was restrained by yearly application of Paclobutrazol to 39-43% of the control plot to which Paclobutrazol was not applied (Table 2) . In the experiment turfgrass fields where Paclobutrazol was applied only in the first year, the emergence weight of weeds increased as years passed, but weight of the weed emerged in the second year was restricted to 51-63% (Table 2) . In order to prove the effect of Paclobutrazol on emergence of individual species of weed, variation in emergence ofBromus catharticusvahl andDigitaria adscendensHenr was studied. The retarding effect of Paclobutrazol application on vegetative growth ofBromus catharticuswas prominent in emergence weight and elongation length. The physiological effect such as on flower-bud formation was also observed (Table 3 and 5) . The effect of Paclobutrazol application on vegetative growth ofDigitaria adscendenswas as conspicuous as in the case ofBromus cat harticus. However, the physiological effect such as on flowerbud formation was not clear (Table 4 and 6) .
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