Photosynthetic Changes and Growth of Paprika Transplants as Affected by Root-zone Cooling Methods under High Air Temperature Conditions after Transplanting

다국어 초록 (Multilingual Abstract)

To overcome high mid-summer air temperatures in South Korea, the effects of two root-zone cooling (RZC) methods on the leaf photosynthesis and growth of paprika transplants were investigated using a growth chamber. Paprika (Capsicum annuum L. cv. Scirocco) transplants grown in 20-cm pots filled with coir under a 14 h·d-1 photoperiod (from 5 am to 7 pm) were exposed to an air temperature of 39°C during the heating period (HP) from 11 am to 4 pm every day for 28 days.
During the HP, the plants were irrigated with a chilled nutrient solution (15°C) for 3 min every hour as a nutrient solution cooling (NSC) treatment and chilled water (15°C) was circulated through the silicone pipes coiled around the root zones in a water circulation cooling (WCC) treatment. No cooling was provided for the No-cooling treatment. Root-zone medium temperatures in the NSC and WCC during HP decreased by 4°C and 8°C, respectively, compared to the No-cooling treatment.
Twenty-eight days after the treatment, the root dry weight was 10-20% greater in RZCs compared to the No-cooling treatment, the root dry weight distribution was greatest, and the electrolyte leakage was lowest in the NSC. Leaf photosynthesis in both RZCs was 30% greater than in the No-cooling from a photosynthetic photon flux density of 250 µmol·m-2·s-1 during HP. The findings here indicate that NSC is more efficient than WCC and that it can alleviate the adverse effects of a high air temperature. Hence, it can be applied to improve paprika transplant production in greenhouses during the summer.

참고문헌 (Reference)

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