Model prediction of frost tolerance as related to winter survival of wheat in Finnish field trials

Authors

• Anne Kari Bergjord Norwegian Institute for Agricultural and Environmental Research, Grassland and Landscape Division Kvithamar, N-7500 Stjørdal, Norway; Norwegian University of Life Sciences, Department of Plant and Environmental Sciences, Box 5003, N-1432 Ås, Norway
• Helge Bonesmo Norwegian Institute for Agricultural and Environmental Research, Grassland and Landscape Division Kvithamar, N-7500 Stjørdal, Norway
• Arne Oddvar Skjelvåg Norwegian University of Life Sciences, Department of Plant and Environmental Sciences, Box 5003, N-1432 Ås, Norway

DOI: https://doi.org/10.2137/145960610791542343

Keywords:

winter wheat, frost tolerance, phenological development, ice cover, snow mould, winter survival

Abstract

The model FROSTOL simulates course of frost tolerance in winter wheat on a daily basis from sowing on as affected by soil temperature (2 cm), snow cover, phenological development, and a genotypic maximum level of frost tolerance (LT50). A series of cultivar trials in Finland was used to evaluate the model's ability to estimate plant survival in natural field environments during winters with differing weather conditions. Recorded survival was compared with number of intersections between the curves of simulated LT50 and the soil temperature curve for each field. A cumulative stress level (CSL) was calculated based both on number of intersections and FROSTOL simulated stress levels. The correlation between CSL and field recordings was quite low. While the field trials characterize a general ability to stand various types of winter stress, FROSTOL estimates damage caused by the soil temperature regime only. However, FROSTOL simulations seemed to correspond reasonably well to field observations when low temperature was the eventual cause of damage.