Add Q1 Fotosynthese van een belicht aardbeiengewas (BO-20-021-030)

In order to save on electricity and CO2 during cultivation, more knowledge about the photosynthesis of strawberry under glass is necessary. In a consultancy research, two basic ways to collect more basic knowledge were sought. On the one hand by measurements of light and CO2-dependent photosynthesis responses and on the other hand by a literature study and comparing parameters about photosynthesis.

Measurements in the period from mid-March to mid-May 2016 showed that the photosynthesis rate and electron transport efficiency in old leaves was comparable to young leaves, while the stoma conductance in young leaves was always higher. The capacity for photosynthesis in saturated CO and light was higher in old leaves. There was also a decline in photosynthesis rate at the middle measurement point (April), possibly caused by the crop's adaptation to higher CO contents in the greenhouse.

The literature study showed that light saturation occurs at ~ 1000 μmol m s and CO saturation at ~ 1100 μmol mol and that the average photosynthesis rate at these saturation points was 18 and 35 μmol m s. Furthermore, the average maximum light utilization efficiency (quantum yield) in low light was ~ 0.06 μmol CO per μmol PAR. This is comparable to other, rapidly growing greenhouse crops (cucumber, tomato, paprika). With strawberry, there are still large gaps in knowledge about the progress of photosynthesis during a whole growing season.