Incorporating environmental factors to describe wild radish (Raphanus raphanistrum) seedling emergence and plant phenology. Issue 6 (26th November 2020)

• Record Type: Journal Article
• Authors: Reinhardt Piskackova, Theresa; Reberg-Horton, S. Chris; Richardson, Robert J.; Jennings, Katie M.; Leon, Ramon G.
• Is Part Of: Weed science. Volume 68:Issue 6(2020)
• Page Start: 627
• Page End: 638
• Publication Date: 2020-11-26
• Subjects: Hydrothermal time, -- integrated weed management, -- predictive models, -- thermal time, -- weed growth; 632.505
• DOI: 10.1017/wsc.2020.64
• Languages: English
• ISSNs: 0043-1745

Abstract

Abstract: Wild radish ( Raphanus raphanistrum L.) is a weed found globally in agricultural systems. The facultative winter annual nature of this plant and high genetic variability makes modeling its growth and phenology difficult. In the present study, R. raphanistrum natural seedbanks exhibited a biphasic pattern of emergence, with emergence peaks occurring in both fall and spring. Traditional sigmoidal models were inadequate to fit this pattern, regardless of the predictive environmental variable, and a corresponding biphasic model (sigmoidal + Weibull) was used to describe emergence based on the best parameters. Each best-fit chronological, thermal, and hydrothermal model accounted for at least 85% of the variation of the validation data. Observations on phenology progression from four cohorts were used to create a common model that described all cohorts adequately. Different phenological stages were described using chronological, thermal, hydrothermal, daylength-dependent thermal time, and daylength-dependent hydrothermal time. Integrating daylength and temperature into the models was important for predicting reproductive stages of R. raphanistrum .