Articles
INFLUENCE OF WINTERCOVERS ON CROWN TEMPERATURE, TISSUE BROWNING AND YIELD OF ‘KORONA’ STRAWBERRIES
Article number
439_145
Pages
887 – 892
Language
Abstract
Wintercovers were tested at two strawberry fields in Mid-Norway.
In the first experiment, ‘Korona’ strawberries were planted on 20th June 1994 in lowland on the east bank of the Trondheim fjord.
Wintercovers were barley straw, Agryl P 17 Unicorn fleece and single layered, 100 cm wide, clear bubble polyethylene foil with or without brown paper laminate.
Snow was removed from the field and temperatures were logged with a LI-1000 logger.
The covers were applied in late October 1994 and were removed in early April 1995. The lowest crown temperature were -15.0°C on 1st February in uncovered plots.
The temperature under straw were then -10.0°C and under the other covers from -6.0°C to -9.0°C. Compared with uncovered plants, covered plants had less browning of crown tissue and higher yields.
Plants protected with straw had a yield gain of 42.5% compared with uncovered plants.
Plants otherwise protected also had yield gains, but these were less than if protected with straw.
In the first experiment, ‘Korona’ strawberries were planted on 20th June 1994 in lowland on the east bank of the Trondheim fjord.
Wintercovers were barley straw, Agryl P 17 Unicorn fleece and single layered, 100 cm wide, clear bubble polyethylene foil with or without brown paper laminate.
Snow was removed from the field and temperatures were logged with a LI-1000 logger.
The covers were applied in late October 1994 and were removed in early April 1995. The lowest crown temperature were -15.0°C on 1st February in uncovered plots.
The temperature under straw were then -10.0°C and under the other covers from -6.0°C to -9.0°C. Compared with uncovered plants, covered plants had less browning of crown tissue and higher yields.
Plants protected with straw had a yield gain of 42.5% compared with uncovered plants.
Plants otherwise protected also had yield gains, but these were less than if protected with straw.
In a second experiment on a production field of ‘Korona’ strawberry, planted in June 1995, at a location subjected to cold winters, plants were covered with barley straw or Agryl P 30 Unicorn fleece.
Temperatures were logged with a Multilogg PS7. In the coldest period when the air temperature was -11.5°C, the temperature in crowns under Agryl P 30 was close to -4.5°C, under straw -6°C and uncovered -10°C.
Publication
Authors
R. Nestby
Keywords
strawberry, Fragaria x ananassa, winter frost injury, oxidative tissue browning, cover crop
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