Abstract

SummaryThe influence of soil-heating (30°C) on bolting of Chinese cabbage (Brassica pekinensis (Lour.) Rupr. cv. Spring A1) was studied under inductive air temperatures in growth rooms. In two experiments it was shown that warm roots had no influence on the vernalization effect but that soil heating can decrease the effect of vernalization by heat transfer into the growing point. The heat transfer is favoured by insulating the soil surface and by a short hypocotyl.

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