ISHS Acta Horticulturae 119: III International Symposium on Water supply and Irrigation in the open and under Protected Cultivation
ENERGY SAVING RESEARCH BY SWEET PEPPER, GROWN IN ROCKWOOL AND IN RECIRCULATING WATER |
| Author: | C.C.M. Winden |
| Abstract:
Since 1978 effects of low night- and high daytemperature on growth and production of sweet pepper is studied. Lowering nighttemperature directly after planting did not effect growthrate and early production significantly, but nearly 30% of total production consisted of mishapen fruits without good seedset. This negative effect on fruit-quality could be avoided by maintaining a higher daytemperature combined with the lower nighttemperature. Comparing the normal temperature sheme (20°C during 6 weeks, afterwards 17°C at night and 23°C at daytime) with the investigated scheme (15°C continuously at night and 23°C at daytime) an energy saving of about 15% could be achieved. This year further investigations are done concerning lower night-temperatures (even 12°C) and the use of a permanent plastic screen. In each of three compartments sweet pepper plants are cultivated both in rockwool and in different systems with recirculating water. On rockwool the effect of roottemperature and Ca/K-support on growth and quality (blossom-end rot) is studied. Concerning the recirculating water the effects of different gullies, watersupply and amount of water in the gullies is studies, in order to find a cheap and reliable growing sytem. | |
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