Effect of Rice Vigour on Growth and Yield under Dry and Wet Direct Seeding

Abstract

Rice seed vigour recognized as a quality of seed. Which may affect growth and yield of plant grown under different environment. So, the study of rice seed vigour on growth and yield was carried on dry and wet direct seeding at Phitsanulok Rice Seed Center in 2002-2003. Randomized complete block design with six replications and three treatments were employed. The treatments were untreated seed, water soaked and infected seed with three diseases. Qualities of seed germination and vigour were tested prior to broadcasting. Only seed with germination over 80% and different seed vigour were used. Plant height, density and dry weight at 30 and 60 days after broadcasting and yield were collected. The results showed that vigour affected early plant growth only under stress environment. Seedlings germinated form high vigour seed had better growth than medium and low vigour seeds. However, after fertilizer application, the growth and yield were not different from each other. The effect of seed vigour was not found under any suitable environment.