Grip on light in Phalaenopsis Diffuse light is beneficial for plant growth. Furthermore, in greenhouses with pot plants more light can be allowed if the light is diffuse. When combined with the Next Generation Cultivation (‘Het Nieuwe Telen’) new possibilities arise to improve production and to save energy.
This report describes an experiment with Phalaenopsis, where the light was made diffuse by a diffuse screen, diffuse glass or by growing the plants in the Daylight greenhouse. Phalaenopsis can grow well at light levels 10 mol m-2 d-1, although at start of the cultivation the high light level should be realised gradually.
During the raising phase of the crop from April to September plant growth was stimulated by diffuse glass. In order to save energy in the winter period in the diffuse light treatments, the temperature setpoint was lowered 1˚C and light integration was applied. This resulted in a slight energy saving, but at the end of the cultivation the initial growth enhancement under diffuse glass was nullified.
To avoid the risk of leaf damage due to too much light, methods for plant monitoring were improved. The Plantivity sensor improved such that the sensor can measure for one week on the same leaf instead of changing the leaf every 2-3 days. Furthermore, the sensor can now be used to measure potential photosynthesis which allows a better estimate of the efficiency of photosynthesis.