Field studies were conducted in southern Queensland to determine the impact of sorghum cultivars and crop densities on weed suppression and sorghum yield loss due to weeds. Japanese millet (Echinochloa esculenta (A. Braun) H. Scholtz) was used to mimic barnyard grass (Echinochloa spp.). Results showed that differences in competitive ability of the cultivars were consistent over the two years, with MR Goldrush and Bonus MR being the most competitive cultivars, and 86G87 the least competitive. Sorghum density also had a significant effect on the crop's ability to compete with millet, with the strongest millet suppression at the highest density of 7.5 plants m-2. Millet caused significant yield loss, up to 34% in comparison with weed-free plots. These results indicate that sorghum competition against Japanese millet can be improved by choosing competitive cultivars and the use of higher crop densities. Improved sorghum competition provides a non-chemical option for integrated weed management.
|Title of host publication||16th conference proceedings|
|Subtitle of host publication||Hot topics in the tropics|
|Place of Publication||Brisbane|
|Publisher||Queensland Weeds Society|
|Number of pages||4|
|Publication status||Published - 2008|
|Event||16th Australasian Weeds Conference - Cairns, Australia, Australia|
Duration: 18 May 2008 → 22 May 2008
|Conference||16th Australasian Weeds Conference|
|Period||18/05/08 → 22/05/08|
Wu, H., Walker, S., Osten, V., & Robinson, G. (2008). Competitive effects of sorghum cultivars and densities on weed suppression. In 16th conference proceedings: Hot topics in the tropics (pp. 483-486). Queensland Weeds Society.