水田作におけるクサネムの生態と防除

概要

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1. Seeds of jointvetch are very hard and display dormancy when fully ripe. On account of their dormancy, the time required for the emergence of the plant is usually long and variable. In the experiments conducted in Kanagawa Prefecture, however, the weed emerged throughout the, year except in the frost season. 2. Soil conditions characterized by a saturated moisture level were more favorable for the emergence of jointvetch seed than submerged soil conditions and the emergence ratio seemed to increase with shallow flooding during the period of drainage associated with rice transplantataion. 3. Jointvetch was highly sensitive to pre or early post-emergence treatment of diphenyl ether, s-triazine and phenoxy types herbicides. However, foliar application of herbicides could not control jointvetch perfectly when the plant height exceeded 20 cm. For example, paraquat killed the leaves already developed but the new leaves developed after the treatment and the axillary buds grew normally. 4. Commercial herbicides which are able to control jointvetch are effective when applied during the period from the pre-emergenc to the first-leaf stage of this weed. Moreover, the emergence of the weed takes place during a comparatively long period of time. Therefore, it is recommended to apply suitable herbicides successively twice to 3 times for instance, once before transplanting of rice or once or twice after transplanting.
日本雑草学会の論文
1983-08-05