Diagnosing for the influence on strawberry growth by EC management using a 3‑D depth sensor

H. Umeda, Y. Mochizuki, M. Takahashi, Y. Kawagoe
Continuous monitoring of plant height and leaf area of cultivated strawberry (Fragaria × ananassa Duch.) is required in order to determine if the climatic environment and fertilization management are appropriate. Plant height and leaf area have a great influence on the light environment of the plants which is a major factor in determining the photosynthetic rate. However, it is very difficult to optimize the light environment in real time because plant states are mostly measured manually. In this study, we developed a non-destructive sensing system for plant states using a 3-D depth sensor. Thus, we investigated whether it is possible to non-destructively evaluate the influence of electrical conductivity (EC) management on strawberry growth using the 3-D depth sensor, Kinect for Windows v1 (Microsoft). Two cultivars of strawberry were planted in a cultivation bed and were cultivated with two controlled nutrient solution concentrations of EC 0.9 and 1.8 dS m‑1. Comparison of the measured plant height with actual plant height resulted in an estimation accuracy of R>0.97 using a linear regression method. We calculated plant growth rate by the shift in plant height with age and it was confirmed that the growth rate of EC 0.9 dS m‑1-controlled plants was faster than that of the EC 1.8 dS m‑1-controlled plants. Furthermore, the difference in the spatial distribution of leaves under different EC management was observed using the 3-D depth sensor. Based on the results, we can conclude that we can investigate the influence of EC management on strawberry growth nondestructively. The approach described in this paper can assist farmers in real time EC management for plant growth using the 3-D depth sensor.
Umeda, H., Mochizuki, Y., Takahashi, M. and Kawagoe, Y. (2020). Diagnosing for the influence on strawberry growth by EC management using a 3‑D depth sensor. Acta Hortic. 1296, 1035-1040
DOI: 10.17660/ActaHortic.2020.1296.130
non-destructive measurement, plant growth, plant height, light-intercepting characteristics, environmental control

Acta Horticulturae