ISHS Acta Horticulturae 118: Working-party on Greenhouse Cucumber
EFFECTS OF CARBON DIOXIDE ENRICHMENT AND TEMPERATURE PROGRAMME ON THE GROWTH AND YIELD OF GLASSHOUSE CUCUMBERS |
| Author: | D.J. Dennis |
| Abstract:
Responses of winter sown cucumbers to CO2 enrichment (to 900 μl/l) were measured at widely separated (25/15°) or closely spaced (21/19°) day/night heating set-points. Ventilation set-points of 30 and 28° C were used with the 26/15° programme and 24° with 21/19°. Treatments were applied during propagation and after planting. Enrichment with the 25/15° settings resulted in marked increases in net assimilation rate and relative growth rate. Responses were much lower in the 21/19° treatment. Highly significant increases in both early and total yield occurred with pre-planting enrichment but responses were of lesser magnitude than for full season enrichment which gave total yield increases greater than 40%. Yields were generally higher with the 25/15° settings even when CO2 was not given though differences did not reach significance. Differences in heating and CO2 enrichment costs were estimated and are discussed. | |
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