Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56, 81-86
Published online 2014-11-14

Effect of cumulative growing degree day on accumulation of alfalfa (Medicago sativa L.) root reserve saccharides

Josef Hakl, Jaromír Šantrůček, Pavel Fuksa, Josef Kalista

Katedra pícninářství a trávníkářství, Česká zemědělská univerzita v Praze, Kamýcká 129, 165 21, Praha 6 - Suchdol, Česká republika

The aim of this study was to investigate the relation between growing degree day method and accumulation of root reserve saccharides before over wintering by alfalfa (Medicago sativa L.) in the condition of Czech Republic. In 2002–2004, the field experiment was conducted at the Research station of the Czech University of Life Sciences in central Bohemia. The interval between summer and last autumn harvest was 40–50 days or 60–70 days, respectively. These intervals were expressed as cumulative growing degree-days (GDD) for each year. The plants were sampled in each autumn with four replicates for each variant; the average depth of sampling was 150 mm. The weight of roots, amount of starch, and water soluble saccharides (WSC) per m2 was determined. The total accumulation of root reserve saccharides was determined mainly by conditions during all vegetation period. The length of the interval or cumulative GDD influenced only variation of this basic amount. The GDD was corresponded better with starch content whilst WSC was more related to length of the interval. In central Bohemia condition, the GDD 600–700 °C was preliminary determined for maximal accumulation of root reserve saccharides. The GDD above this level did not significantly increase the root reserve accumulation. For exact verify of this model, other experiments in more sites are needed.


Práce byla zpracována za podpory MSM 6046070901.


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