Effects of shade and watering frequency on growth and development of glyphosate-resistant and susceptible biotypes of goosegrass (Eleusine indica (L.) Gaertn.)
B.S. IsmailA, T.S. ChuahA, S. SalmijahA and Y.T. TengB
A School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia.
B Monsanto (M) Sdn Bhd., Jalan Dungun, Damansara Heights, 50490 Kuala Lumpur, Malaysia.
The interactions between shading levels and watering frequency on growth of glyphosate-resistant (R) and -susceptible (S) Eleusine indica (L.) Gaertn. biotypes was investigated under non-competitive conditions in the greenhouse. Under full sunlight with daily watering frequency, the S biotype produced higher total bio-mass and number of tillers than the R biotype whilst the R biotype produced a greater number of spikes and matured earlier than the S biotype. Under 80% shade, the number of tillers and total dry weights of both biotypes generally decreased significantly irrespective of watering frequency. Under this condition, increased root partitioning as watering intervals decreased was only observed in the S biotype. Under the same shading level, the S biotype partitioned less dry matter to inflorescences but more into vegetative parts as compared to the R biotype at 1- and 7-day watering intervals.
Plant Protection Quarterly (2003) 18 (1) 30-34.