Effect of photoselective plastics on the quality of greenhouse grown lettuce
2002
Kleemann, M. (Academical Agricultural Society, Tartu (Estonia))
The aim of the experiments was to assess the effect of far-red filter on the quality of lettuce plants. The experiments with lettuce were carried out in the greenhouses of University of Tartu, Institute of Plant Physiologie in 2000 and 2001. The colour of plants grown under far-red filter was beautiful light green compared to plants grown in control, which were yellowish, darker green. Under far-red filter grown plants tasted less bitter compared to plants in control. Scattered radiation penetrated deeper inside of lettuce than direct beam. Therefore spectral filter affected also leaf orientation. Lettuce leaf position became more upright in control plants compared to plants grown under a far-red absorbing film. The incidence of tipburned leaves decreased under far-red filter. The yield was not significantly different. Calcium content was significantly higher under far-red filter. Plants grown under far-red filter contained less dry matter and chlorophyll
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