To control the impact on environment of the greenhouse activities soilless systems have been used since many years. The culture system on trays seems to have enough flexibility regarding both the method to contain the substrate, both the feeding system for water and nutrient solution. However, the whole water balance is changed: the plant requirements and the internal hygrometric level are one another dependent. The ventilation is primarily projected to control hot temperatures during the day, but nevertheless must control the air-humidity level. An experiment inside an equipped tunnel for pot cultures on trays was set up: soil and substrate were coated with opaque and waterproof plastic films in order to evaluate the plant transpiration. A sample of 6 plants of zucchini (Cucurbita pepo L., var. Afrodite – Sandoz Seeds) was measured every 30 minutes in order to know the variations of the total weight of the plant-substrate system. The environment physical parameters, the ventilation rate, the physiological parameters of the plant, the water supplied and the product removed were recorded . The experimental data collected show a high dependence of the transpiration from the solar radiation: plants characterized by a reduced development at the beginning of the productive cycle seem to be more correlated.
The control of ventilation into tunnels with cultures on trays
BIBBIANI, CARLO
2003-01-01
Abstract
To control the impact on environment of the greenhouse activities soilless systems have been used since many years. The culture system on trays seems to have enough flexibility regarding both the method to contain the substrate, both the feeding system for water and nutrient solution. However, the whole water balance is changed: the plant requirements and the internal hygrometric level are one another dependent. The ventilation is primarily projected to control hot temperatures during the day, but nevertheless must control the air-humidity level. An experiment inside an equipped tunnel for pot cultures on trays was set up: soil and substrate were coated with opaque and waterproof plastic films in order to evaluate the plant transpiration. A sample of 6 plants of zucchini (Cucurbita pepo L., var. Afrodite – Sandoz Seeds) was measured every 30 minutes in order to know the variations of the total weight of the plant-substrate system. The environment physical parameters, the ventilation rate, the physiological parameters of the plant, the water supplied and the product removed were recorded . The experimental data collected show a high dependence of the transpiration from the solar radiation: plants characterized by a reduced development at the beginning of the productive cycle seem to be more correlated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
