Nonlinear Regressions for Analyzing Growth Stage and Quinclorac Interactions
| Autor: | Chism Wj, Bingham Sw, Jeffrey B. Birch |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
0106 biological sciences
Plant growth 04 agricultural and veterinary sciences Plant Science 01 natural sciences 010602 entomology chemistry.chemical_compound Horticulture chemistry Dry weight 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Quinclorac Stage (hydrology) Agronomy and Crop Science Nonlinear regression Mathematics |
| Zdroj: | Weed Technology. 6:898-903 |
| ISSN: | 1550-2740 0890-037X |
| DOI: | 10.1017/s0890037x00036447 |
| Popis: | Control of southern crabgrass by quinclorac was influenced by plant growth stage. A three-parameter nonlinear regression was used to describe the influence of quinclorac concentration on each growth stage and to compare growth stages. A SAS® program for these comparisons is described. Pseudo R2values for fit were above 0.98 for all tests. Flowering crabgrass plants had the highest GR50value (50% growth reduction on a dry weight basis) whereas preemergence, three- to five-true-leaf, and two- to four-tiller stages were lower. |
| Databáze: | OpenAIRE |
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