Risks of later spring frosts and earlier autumn frosts when growing sugar beet in Central Bohemia
2013
Potop, V., Czech Univ. of Life Sciences, Prague (Czech Republic). Dept. of Agroecology and Biometeorology | Turkott, L., Czech Univ. of Life Sciences, Prague (Czech Republic). Dept. of Agroecology and Biometeorology
This study presents a detailed assessment of probability of later spring frosts and earlier autumn frosts when growing sugar beet in Central Bohemia in the period 1961-2011. The probability of severe frost at a later date in the spring and an earlier date in the autumn and the length of the frost-free period were estimated. The results of probability analysis show a decreasing risk of frosts, especially in May and September, with extension of the frost-free season in the autumn, which has a significantly positive effect on the yield of sugar beet. In Central Bohemia, at altitudes up to 250 m, with the highest concentration of sugar beet production areas, the occurrence of frosts in May is very dangerous for young sugar beet plants and it occurs approximately once in 10 years; at altitudes from 250 to 300 m, the risk is significantly higher at once in 4 years. On average, the onset of autumn frost occurs regardless of altitude in the second and third decades of October. In the regions with the highest concentration of sown area of sugar beet, i.e., lowlands and hilly terrain of Central Bohemia, the frost-fee season is, on average, 186 or 180 days long. This corresponds to the average length of the growing season of sugar beet.
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