Biosensing Method of Growth Diagnosis in Forcing Culture of Strawberry

—Available Airflow Velocity for Monitoring of Young Leaves—

Abstract

To add airflow to strawberry plants to expose young leaves, we investigated the physical characteristics of leaves associated with the air velocity that damages the leaves. First, the drag coefficient of the leaf blade gradually decreased with respect to the air velocity. Subsequently, as an indicator of petiole damage due to load, the bending stress of the petiole was as strong as 44 MPa in the third leaf and 32 MPa in the other leaves. Young’s modulus was 89 MPa for new leaves and higher for older leaves, indicating higher strength against buckling. In addition, damage at the plant base was more likely to occur when petioles were narrower.