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16 June 2014 Development of a thermal-time model for combinational dormancy release of hairy vetch (Vicia villosa ssp. villosa)
Juan P. Renzi, Guillermo R. Chantre, Miguel A. Cantamutto
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Seed dormancy could be a factor related to natural reseeding of hairy vetch (Vicia villosa ssp. villosa Roth.), a winter annual species cultivated for seed, pasture, hay, green manure and cover crop. The presence of combinational dormancy (physical dormancy   physiological dormancy, PY   PD) in hairy vetch was explored by a model using laboratory and field measures. At the stage of natural dispersal, dry seeds of hairy vetch were stored under laboratory conditions at 5, 10, 20 and 30°C (±2°C) or buried at 5 cm depth in an experimental field. Germination at 5, 8, 10, 15, 20 and 25°C was assessed at regular intervals up to 295 days after harvest. Following the hypothesis of the existence of a combinational dormancy mechanism, model development was based on the estimation of: (i) the fraction of non-PY seed as a function of after-ripening thermal-time accumulation, and (ii) seed population thermal parameters associated with a given level of PD. The developed model adequately described the after-ripening thermal-time requirements for PY   PD release of V. villosa. Based on model predictions, under a semi-arid thermal regime, >45% of vetch seeds shed during the summer season would be able to germinate during early autumn. Thus, the seed-bank size threshold at the end of the first growing season should be >65 seeds m–2 in order to reach a minimum stand of 30 plants m–2 necessary for a productive pasture.

© CSIRO 2014
Juan P. Renzi, Guillermo R. Chantre, and Miguel A. Cantamutto "Development of a thermal-time model for combinational dormancy release of hairy vetch (Vicia villosa ssp. villosa)," Crop and Pasture Science 65(5), 470-478, (16 June 2014).
Received: 9 December 2013; Accepted: 1 May 2014; Published: 16 June 2014
annual pasture
arid-semiarid region
Vicia spp
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