Weed Science Laboratory, South China Agricultural University, Guangzhou 510 642, China.
*Correspondence author: E-mail: hufei@scau.edu.cn
The stability of 9 allelopathic rice accessions against barnyard grass was investigated with different sowing-dates approach in paddy field. The results showed that the inhibitory rates of rice on barnyard grass varied significantly with test rice accessions and barnyard grass sowing-dates. The inhibitory effects of 3 hybrid rice accessions on barnyard grass showed higher stability than other 7 inbred rice accessions. During the vegetative phase, the inhibitory rates of 9 rice accessions tested were positively related to mean daily temperature and sunshine duration, but negatively related to daily rainfall. However at rice maturity stage, the inhibitory rates of 9 rice accessions were positively related to mean daily temperature and sunshine duration, but negatively related to mean daily rainfall. Thus meteorological and environmental factors affected the stability of allelopathic rice against barnyard grass in paddy field.
Allelolapthy, barnyard grass, meteorological factors, Oryza sativa L, weed-suppressive stability, paddy field
