Photosynthetically active radiation in strawberry produced in stair-like containers

Resumo

In intensive hydroponic systems, such vertical and pyramidal systems, photosynthetically active radiation (PAR) and integrated (IPAR) may be intercepted by the containers and the leaf area of the plants grown in the upper strata, decreasing fruit yields and quality. This objective of this study was to evaluate the behavior of PAR and IPAR at different planting heights and the effect geographic orientation and fruit yield and quality of strawberry produced in horizontal stair-like containers. The factors were four heights of the container (20, 50, 80 and 110 cm) and two orientations (east and west). At each height and orientation of the container, PAR and IPAR, yield and fruit total soluble solids were measured. PAR and IPAR were statistically different at all heights evaluated and were highest in the highest containers. The east and west orientation of the containers was significantly different in the morning and in the afternoon for PAR and IPAR, while daily average values were equal. Yield on average was 47% higher in plants cultivated in containers at heights of 50, 80 and 110 cm, relative to those in 20 cm high containers. Fruits grown in the highest containers had higher values of total soluble solids.