Schriften zu Genetischen Ressourcen - Genres

U. FREYTAG, G.H. BUCK-S ORLIN and B. SCHMIDT
Duration of cultivation
Whereas the genotype had no significant influence on the duration of cultivation, the
effect of the year was considerable. The temperature of all months except May, had
a significant effect on the length of the cultivation period: High and normal temperatures
in June led to a prolongation, whereas high July temperatures decreased the
cultivation period; a deviation from normality of August temperatures always led to an
increase of the cultivation period. A dry May decreased cultivation period, while rain
in June had no significant effect on the cultivation period. On the other hand, high
precipitation in July and August considerably prolonged the cultivation period. The
effect of relative air humidity on the cultivation period gained in significance with increasing
duration of the cultivation period: a high humidity in June decreased the cultivation
period, whereas the opposite effect was observed (i.e., a prolongation of the
cultivation period) for high humidity in July and August.
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