Stability of corn (Zea mays)-foxtail (Setariaspp.) interference relationships
| Autor: | David A. Mortensen, Jason C. Fausey, Steven J. Langton, John L. Lindquist, Brett Hayden Bussler, Sharon A. Clay, James J. Kells, Kevin R. Banken, R. Gordon Harvey, W. J. Lambert, Philip Westra, Thomas T. Bauman, Frank Forcella |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
0106 biological sciences
Setaria biology Crop yield Economic threshold media_common.quotation_subject 04 agricultural and veterinary sciences Plant Science Weed control biology.organism_classification 01 natural sciences Stability (probability) Competition (biology) 010602 entomology Agronomy Foxtail 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Agronomy and Crop Science Nonlinear regression Mathematics media_common |
| Zdroj: | Weed Science. 47:195-200 |
| ISSN: | 1550-2759 0043-1745 |
| Popis: | Variation in interference relationships have been shown for a number of crop-weed associations and may have an important effect on the implementation of decision support systems for weed management. Multiyear field experiments were conducted at eight locations to determine the stability of corn-foxtail interference relationships across years and locations. Two coefficients (IandA) of a rectangular hyperbola equation were estimated for each data set using nonlinear regression procedures. TheIandAcoefficients represent percent corn yield loss as foxtail density approaches zero and maximum percent corn yield loss, respectively. The coefficientIwas stable across years at two locations and varied across years at four locations. Maximum yield loss (A) varied between years at one location. Both coefficients varied among locations. Although 3 to 4 foxtail plants m−-1row was a conservative estimate of the single-year economic threshold (Tc) of foxtail density, variation inIandAresulted in a large variation inTc. Therefore, the utility of using common coefficient estimates to predict future crop yield loss from foxtail interference between years or among locations within a region is limited. |
| Databáze: | OpenAIRE |
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