Effects of Rates and Flooding Times of Rice Straw on Weed Control Growth and Yield of Rice under Zero Tillage Condition

Abstract

Effects of rates and flooding times of rice straw on weed control growth and yield of rice under zero tillage condition was conducted at Pathum Thani Rice Research Center. A split plot design with 4 replications was used. Flooding times, 1 10 and 20 days, were used as the mainplot and rates of rice straw, 0 1,500 2,000 and 2,500 kg/rai, as the subplot. The rice cultivar, SP 90, was broadcasted in pre-germinated dircet-seeded rice at 15 kg/rai onto flooded rice straw. The results showed that no weed at 30 days after seeding (DAS) of all treatments. At 30 DAS, the plant height was higher in treatment of rice straw than in check. The rate of rice straw, 2,000 kg/rai, had higher number of plant at 30 DAS, number of panicle and yield than other treatments but showed no significant differences. The flooding time at 20 days had higher plant height and number of plant at 30 DAS, number of panicle and yield than the flooding time at 1 and 10 days but showed no significant differences.