Abstract
For sod-seeding of red clover into orchardgrass or timothy dominant meadow, the supression of grass by herbicide was investigated. In experiment 1, small amount of glyphosate was sprayed for the temporary suppression of grass instead of killing them. In experiment 2, doses of paraquat, 0, 200, 300 and 500 cc/10 a were compared for the temporary suppression of grass. In experiment 3, time of sod-seeding of red clover was compared every half month from 1 June to 15 September. In preliminary experiment for spray, 30 〜 50 cc/10 a of glyphosate was found to be suitable for the suppression of grass. And much more spray of glyphosate decreased plant number of orchardgrass. Establishment of red clover drill-seeded after herbicide spraying was better in the order, paraquat 300 cc/10 a, glyphosate 50 cc/10 a, glyphosate 30 cc/10 a and no herbicide spray in experiment 1. Spray of 200 cc/10 a paraquat was found suitable for the suppression of grass in experiment 2. Establishment of red clover seeded on 1 Aug. and 15 Aug. was poor in experiment 3, and it seemed that seeding at higher mean temperature than 19℃ should be avoided.
