Analysis of competition between wet-seeded rice and barnyardgrass (Echinochloa crus-galli) using a response–surface model
| Autor: | Keith Moody, Hanwen Ni, Restituta P. Robles |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
0106 biological sciences
0301 basic medicine Crop yield media_common.quotation_subject Plant Science Biology Echinochloa biology.organism_classification 010603 evolutionary biology 01 natural sciences Echinochloa crus-galli Competition (biology) Crop 03 medical and health sciences 030104 developmental biology Agronomy Dry season Cultivar Weed Agronomy and Crop Science media_common |
| Zdroj: | Weed Science. 52:142-146 |
| ISSN: | 1550-2759 0043-1745 |
| DOI: | 10.1614/p2002-148 |
| Popis: | Competition between wet-seeded rice and barnyardgrass under two distinct environments was analyzed using a two-parameter response–surface model at the International Rice Research Institute in the Philippines. The findings showed that this model could predict crop yield loss due to weed competition over a wide range of crop and weed densities. The low-tillering, new plant–type cultivar was a weaker competitor and had a higher yield loss than high-tillering cultivar ‘IR72’ and a hybrid. Increasing the crop density could reduce yield loss due to weed competition. This effect was greater for the new plant type than for IR72 and the hybrid when barnyardgrass density was low. In contrast, this effect was less for the new plant type than for IR72 and the hybrid when the weed density was high. Competitiveness of the three rice cultivars was also affected by season. Crop yield loss was higher in the wet season than in the dry season. Nomenclature: Barnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCG; r... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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