| Inhibitory effect of 22 new allelopathic rice strains on barnyard grass 也Echinochloa crusgalli (L.) Beauv 页
was compared with PI312777, a strong allelopathic rice of the United States as control, by using field plot experiment. The
inhibition rate before sealing line, inhibition rate of competition and inhibition rate of filling stage of allelopathic rices, and
the average plant height and the dry weight per plant of associated barnyard grass were investigated in this paper. The
results showed that the inhibitory effect of allelopathic rice on barnyard grass was influenced by environmental conditions,
and the allelopathy effect was relatively stable, while the competition effect varied greatly with the environment. The
allelopathic rices mainly inhibited weed germination and made weak resource competitive weed to death. The inhibitory
rate before sealing line was the main factor affecting the total inhibitory effect of allelopathic rices on barnyard grass. Based
on the inhibitory rate of filling stage, we preliminarily screened 12 new allelopathic rice strains with strong and relatively
stable inhibitory effect on barnyard grass in the field, they were allelopathic rice strains 3, 4, 6, 7, 12, 14, 15, 16, 17, 19,
21 and 22, in which strains 15 and 16 showed strong inhibitory effect on barnyard grass in late season of 2011 and early
season of 2012 and strains 6, 15, and 19 showed stronger inhibitory effect on barnyard grass than PI312777 in late season
of 2011. The screening of these new allelopathic rice strains will help the breeding and production application of
commercial allelopathic rice. |
