Weather conditions and biosynthetical processes in hop cone
1997
Krofta, K. | Rigr, A. | Nesvadba, V. (Chmelarsky Institut, Zatec (Czech Republic))
An important influence of weather conditions on bitter substances formation is generally accepted. Dynamism of alpha bitter acids formation before harvest in the period 1992 to 1996 showed significant year-to-year differences. It consisted not only in absolute amount of bitter acids, but in composition of hop oils as well. The comparison of meteorological data proved some coherence between alpha bitter acids content and extent of temperature and precipitation deviations from long-term average in the period from July to August. The average air temperatures in the range of 16 to 18 deg C seems to be optimal in Saaz growing region from the point of view of bitter acids formation. Increase of temperatures above this optimum to 20 deg C can be partly compensated by higher amount of rain precipitation in split portions or by irrigation supplied from the ceiling above hop plants (trickle irrigation). The temperatures above 20 deg C with the lack of water lead to the blockage of biosynthetical process.
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