Predicting Seedling Emergence of Three Canarygrass (Phalaris) Species under Semi-Arid Conditions Using Parametric and Non-Parametric Models

The Phalaris genus includes annual weed species such as short-spiked canarygrass (Phalaris brachystachys Link.), little-seed minor Retz.) and hood paradoxa L.), which are especially problematic in Spain; such, there is a need to develop models predict the timing of their emergence. Field experiments were conducted at two different locations during (2006/07 2007/08) three (from 2005/06 growing seasons. In both locations, 500 seeds each sown season, simulating rain-fed cereal field conditions. addition, validated with three, four eight independent for P. brachystachys, paradoxa, respectively. emergence period lasted between 31 48 days after sowing (DAS), showing main flushes. cardinal points parametric non-parametric established be −1 °C 1 base temperature, 9.8 11.8 optimal temperature 21.2 23.4 ceiling temperature; water potential was estimated −1.1 MPa. Both obtained similar results successfully 12 out 15 experiments.