OVERWINTERING AND EARLY PRODUCTION OF SALAD CROPS

In a two year experiment conducted under transparent and translucent acrylic cupolas, in tunnels covered with LDPE stabilized and LDPE normal film as well as in hot bed, higher minimum and maximum temperature of air and temperature of soil were recorded than in the open.
After overwintering in protected cultivation chicory developed heads 13 to 17 days earlier, winter lettuce cv.
Posavka 22 to 30 days earlier, cv.
Nansen 40 days earlier, corn salad 24 to 31 days earlier and their yields were higher than in the open.
Corn salad was suitable for interrow cultivation.
The yield of the softleaved lettuce cv.
Nansen was significantly lower than yield of crispleaved cv.
Posavka.

In comparison with hot bed and tunnels which are widely used for overwintering of salad crops the new material, acrylic cupolas made in Slovenia, was found to be in advantage over the old one because in winter the roots of chicory were not damaged by voles.

Under cupolas, in tunnels and in hot bed spring lettuce cv.
Ljubljanska ledenka was harvested 11 – 19 days earlier and gave significantly higher yield than in the open.

VII International Symposium on Timing Field Production of Vegetables

M. Cerne

https://doi.org/10.17660/ActaHortic.1994.371.43