ISHS Acta Horticulturae 440: International Symposium on Plant Production in Closed Ecosystems
DETERMINING THE RATE OF WILTING OF A GRAFTED SEEDLING IN AN ACCLIMATION PROCESS USING A MACHINE VISION SYSTEM |
| Authors: | Y. Nishiura, H. Murase, N. Honami, T. Taira, A. Wadano |
| Keywords: | acclimation, grafting, machine vision, modeling, moisture content, rigidity, wilting |
| Abstract:
It is important to understand the characteristics of grafted seedlings during the acclimation process, especially the moisture content inside the scion, which depends on the balance between transpiration and supply from the stock. To evaluate the joining rate between the scion and the stock, the moisture content inside the scion has to be measured with a non-destructive method. This can be done effectively by measuring the wilting rate of a grafted seedling. However, wilting depends not only on the moisture content of a seedling, but also on its rigidity and size. To obtain an index of the seedlings' rigidity, a rigidity measuring system was used to measure the resistance force when the stems were cut. Wilting rate was measured with a video camera. A mechanical model for predicting wilting of a seedling was developed. The wilting behavior of the seedlings was non linear. An attempt was made to model this behavior after the balance equation of a spring-mass system, using a synthetic spring coefficient as the variable. The moisture content of a seedling was calculated from the wilting data after evaluation of the model parameters using the apparent synthetic spring coefficient. The wilting behaviors of different seedlings were successfully characterized with this model. | |
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