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TEMPERATURE RESPONSE IN EARLY TOMATO PRODUCTION
Under good light conditions higher temperatures will mostly result in faster growth and earlier, but lower total yield.
If light is weak, high temperatures are dangerous, however.
Work from the horticultural experimental and research stations in England and The Netherlands shows that the higher temperatures during the raising-period will give a heavier plant at planting-time, resulting in an earlier, but sometimes a lower total yield, especially if planting is done very early.
Also, the fruits will be smaller.
Temperatures after planting act more directly, but have the same effect.
During November, December and January a temperature between 15 and 20°C is advisable, afterwards the temperature may rise a little in connection with the better light conditions.
As cultivar, CO2 concentration, soil structure and fertility, water supply and so on will affect the temperature reactions, a fixed temperature scheme cannot be given.