The effect of the root zone warming on the strawberry plants grown with nutrient film technique
1996
Krul, L.
Strawberry plants were grown in Greece under grasshouse conditions during a six month period, from November 15th 1995, till May 15th 1996, using the Nutrient Film Technique (NFT). The aim of the experiment was to investigate whether solution heating could compensate for low air temperature (the unheated glasshouse) during the winter in Greece and result in qualitatively and quantitatively high yield. Rooted runners, cv. "Oso Grande" were grown under three different minimum nutrient solution temperature regimes: the control plants (ambient temperature), 20 deg C and 25 deg C. Flower trusses were removed weekly for two months (January and February), and runners throughout the growing period. No beehives were introduced into the glasshouse. Harvesting started at the beginning of March, with plants from the heated solutions (20 deg C and 25 deg C) giving 38 and 37 per cent of the total marketable yield during the first month of picking, respectively. A minimum nutrient solution temperature of 25 deg C significantly increased plant growth, giving the highest values for shoot fresh weight (104g). According to the results obtained from the experiment, the minimum nutrient solution temperature of 25 deg C significantly increased strawberry yield and earliness, and decreased the occurrence of albino fruits
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