The effect of water and nitrogen availability during grain filling on the timing of dormancy release in malting barley crops |
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| Authors: | Nicolás A Gualano Roberto L Benech-Arnold |
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| Institution: | (1) Cátedra de Cerealicultura, Facultad de Agronomía, Universidad de Buenos Aires/CONICET, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina;(2) IFEVA-Cátedra de Cultivos Industriales, Facultad de Agronomía, Universidad de Buenos Aires/CONICET, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina |
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| Abstract: | Pre-harvest sprouting (PHS) causes immediate loss of seed viability, making barley (Hordeum vulgare L.) grains worthless for malting purposes. Grain dormancy release rate in barley crops is genetically and environmentally
controlled. A 2 year experiment was conducted to evaluate the effect of soil nitrogen and water availability during grain
filling on the dormancy release pattern (and then on the PHS susceptibility) for five malting barley commercial cultivars.
Drought and well-irrigated control treatments were imposed from anthesis onwards, and contrast nitrogen fertilization treatments
were applied at tillering. Nitrogen availability showed no effects on dormancy release. Drought during grain filling accelerated
dormancy release with respect to well-irrigated control in 2004, but not in 2005 year. Mean temperatures during the last stages
of grain filling were much higher (ca. 6°C) in 2005 than in 2004, indicating that high-dormancy loss promoting temperatures
had masked drought effects on dormancy release. |
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| Keywords: | Grain filling Malting barley Pre-harvest sprouting Seed dormancy Soil N availability Water availability |
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