In this study, we focused on changes in stem diameter as an effective indicator in the individual management of fruit trees based on growth monitoring. With the objective of clarifying the characteristics of changes in the stem diameter of blueberry plants as indicators, we implemented the examined device in actual cultivation. A small load cell was examined for continuous and non-destructive measurement. After verifying the accuracy of and errors with the measurement device and the properties of the measurement sites on stems, we conducted a long-term measurement on potted cultivation. From the obtained results, the characteristics points in daily changes, daily growth, and daily minimum values can be used as indicators for growth diagnosis from the stem diameter of blueberry.

Produced a prototype crop truck by remodeling small crawler type sprayer, adapted to the width (0.7～0.9m) of the pathway in the steeply sloped terrace garden, where Satsuma mandarin trees were planted in a single row with central leader trained. Examined the desorption method and inspected the efficiency of crop carrying task and the labor intensity on the workers.

For crop container transport distance of 33～48 meters, the working hours have been significantly reduced by 60～63% when using a 4-wheel handcart or crawler type truck in comparison with hands transportation. The work load intensity grade was improved by more than one grade compared with hand transportation method, and the difference was remarkable for the workers over 60 years old.