Response of glyphosate-resistant and susceptible biotypes of goosegrass (Eleusine indica (L.) Gaertn.) to fertilizer use
T.S. ChuahA, S. SalmijahB, Y.T. TengC and B.S. IsmailB
A Faculty of Agrotechnology and Food Science, Kolej Universiti Sains dan Teknologi Malaysia, Mengabang, Telipot, 21030 Kuala Terengganu, Malaysia.
B School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia.
C Monsanto (M) Sdn Bhd., PO Box 144, 81707 Pasir Gudang, Johor, Malaysia.
Greenhouse studies were conducted to investigate responses of glyphosate-resistant (R) and susceptible (S) Eleusine indica biotypes to different combinations of inorganic fertilizers (NPK) and chicken manure on seedling emergence. Generally, the emergence of both R and S seedlings decreased as nitrogen (N) levels increased, regardless of the phosphorus (P) and/or potassium (K) levels. At high N rates (120 kg ha-1), little or no emergence was observed for both biotypes. Chicken manure applied at 6000 kg ha-1 stimulated emergence of the R and S biotypes by approximately 60 and 270% of the control, respectively. The results of this study suggest that application of 6000 kg ha-1 chicken manure may increase seedling emergence of the R and S biotypes but urea at 120 kg ha-1 appears to limit the abundance of both biotypes. However, further field studies need to be undertaken at a range of sites to verify these findings.
Key words: Chicken manure, emergence, NPK, resistance, weed biotypes
Plant Protection Quarterly (2005) 20 (1) 22-24.