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The effects of temperature on growth and yield of October-sown sweet pepper (Capsicum annuum L.), cv. Delphin, were investigated in a glasshouse experiment. Twelve day/night temperature regimes (16/15, 16/21, 20/12, 20/15, 20/18, 20/21, 24/12, 24/15, 24/18, 24/21, 28/15 and 28/21 °C) were applied during the early postplanting period (early December to mid April). Fresh weight (g plant"1) and leaf number were significantly related with (calculated) 24-h mean temperature, no sig nificant effect of the day/night temperature amplitude was found. Plant height, leaf area and the leaf area/length ratio were significantly correlated to 24-h mean tem perature as well as to the day/night temperature amplitude. The optimum 24-h mean temperature for vegetative growth was between 21 and 23 °C. Yields of total and class 1 fruit (kg itT2) and number of class 1 fruit (m~2) showed a maximum at a 24-h mean temperature of 21-21.5 °C. Raising the 24-h mean air temperature (within the range 16.3 to 23.8 °C) significantly reduced the mean fruit weight of class 1 fruits. The day/night temperature amplitude had a significant positive effect on these variables. The effect of the day/night temperature amplitude on vegetative growth as well as on yield was of minor importance compared to the effect of 24-h mean temperature.

The effects of diurnal temperature regimes on growth and yield of glasshouse sweet pepper.