Articles
THE EFFECT OF GREENHOUSE DOUBLE-ROOF ON TOMATO GROWTH AND YIELD
Article number
357_30
Pages
317 – 324
Language
English
Abstract
An experiment was done to test the efficacy of greenhouse double-roofing on reducing botrytis of tomato and to determine its effect on crop performance.
The experiment used 4 unheated plastic greenhouses, two of them with a single 200 μfilm and the other two with a double roof of 200 μ + 80 μ polyethelene film.
The four greenhouses were equally ventilated during the day and closed at night.
Inside each greenhouse a tomato crop cvs.
Carmello and Vision was grown from January to July.
Greenhouse environment was continously monitored by a datalogger system connected with appropriate PAR, air temperature, and soil temperature sensors.
Double roof increased night air temperature by 1 °C relatively to single roof and by 2 °C in comparison with the open-field, and led to a reduction of 20% in PAR in comparison with the single roof, and of 55% relatively to the open-field.
Soil temperature under double roof was higher than under single roof in January but during the following months soil temperature increased much faster under single roof and by May it was 3 to 4 °C higher in comparison with the double roof.
The plants under double roof were longer due to internode elongation.
Double roof decreased yield by 4.6% but no differences existed on tomato fruit number and earliness between double and single-roof greenhouses.
The experiment used 4 unheated plastic greenhouses, two of them with a single 200 μfilm and the other two with a double roof of 200 μ + 80 μ polyethelene film.
The four greenhouses were equally ventilated during the day and closed at night.
Inside each greenhouse a tomato crop cvs.
Carmello and Vision was grown from January to July.
Greenhouse environment was continously monitored by a datalogger system connected with appropriate PAR, air temperature, and soil temperature sensors.
Double roof increased night air temperature by 1 °C relatively to single roof and by 2 °C in comparison with the open-field, and led to a reduction of 20% in PAR in comparison with the single roof, and of 55% relatively to the open-field.
Soil temperature under double roof was higher than under single roof in January but during the following months soil temperature increased much faster under single roof and by May it was 3 to 4 °C higher in comparison with the double roof.
The plants under double roof were longer due to internode elongation.
Double roof decreased yield by 4.6% but no differences existed on tomato fruit number and earliness between double and single-roof greenhouses.
Authors
A.C. Vargues, J.L. Campo, A. Monteiro
Keywords
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