RESPONSE OF TOMATOES TO LOW NIGHT-HIGH DAY TEMPERATURES AND CARBON DIOXIDE ENRICHMENT

Carbon dioxide enrichment (CO₂) increased yield and cash return of glasshouse tomatoes grown at low, medium, and high night temperatures (5, 13 and 17°C night heat thermostat settings). Heavier yields were consistently obtained at medium night temperatures with CO₂. The combination of CO₂, low night and high day temperature (20° heating and 27° ventilating) was only slightly inferior to medium night, high day temperature with CO₂ but usually gave greater yields and cash returns than low day (16° heating 21° ventilating) medium night temperature without CO₂. Increasing ventilating temperatures from 21° to 24° without CO₂ generally decreased yields and returns.
The effects of CO₂ were similar for crops planted between February and August.

Symposium on More Profitable Use of Energy in Protected Cultivation

R.A.J. White

https://doi.org/10.17660/ActaHortic.1978.76.18