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The effect of autumn-winter light conditions in glasshouse on the growth and the cropping-cycle of butterhead and Iceberg lettuce

Jolanta Kobryń

Department of Vegetables
Faculty of Horticulture, Agricultural University
Nowoursynowska 166, 02-766 Warszawa, Poland

In 1983-1985/86 the experiments were carried out to find the relationship between the growth of fresh weght of butterhead and Iceberg lettuces and the active daily radiation during the autumn-winter period under glass. A close correlation between those factors was found. The growth rate in terms of fresh weight of butterhead lettuce was higher by the lower radiation. The linear relationship between planting and harvest dates allows one to predict the duration of the cropping-cycle of lettuce in a glasshouse during the autumn and winter period.

Kobryń J., 1989. The effect of autumn-winter light conditions in glasshouse on the growth and the cropping-cycle of butterhead and Iceberg lettuces. Folia Horticulturae I/2: 17-25.