Stems' diameter variations to detect sympodial orchids' water stress / Naimah Mat Isa … [et al.]

The measurements of stems' has played an important indicator for plant's water status. Many researches have been carried out in terrestrial plants to investigate the stems' variations of responses that had inspired to develop a precise irrigation system. Hence, the work presented in this thesis investigates the stems' variations in epiphyte plants that are sympodial orchids. A strain gauge was used as a sensor to measure the orchid's stem variation for 48 days at two stages of measurements. The Dendrobium orchid that grew from tissue culture was chosen as a sampling plant due to its popularity as a cut flower in the world's demand. The experiment was done within 30 days involving 10 samples of orchid plants growing indoor and outdoor. The measurements were recorded every 15 minutes continuously along the experiment executed. The 2 mm aluminium strain gauge and it's signal conditions that integrated with PIC produced a correlation at 0.96 between its output and the changes in displacement. The results showed that the stems' diameter variations in Dendrobium orchids could be manipulated for further analysis and it had played a significant role for triggering further researches in the developments of a precise watering system in the orchid farms

Rapid and nondestructive techniques for internal and external quality evaluation of watermelons: A review

Watermelon has emerged to the forefront in research advances due to its attractive high nutrient value. Quality attribute of watermelon is a critical aspect of postharvest storage, consumer preference, and commercial acceptability of the fruit. The promising technologies of quality evaluation using nondestructive techniques as part of postharvest handling have gained much attention in recent years. The current trends seek nondestructive techniques that are rapid, low cost, and provide objective measurements. This review highlights some recent applications of nondestructive techniques in the quality evaluation of watermelon by replacing conventional methods which are time-consuming, laborious, and tedious. Quality assessment of watermelons, especially during harvesting and sorting/grading processes, is discussed in this paper, focusing specifically on the feasibility of its application and performance by providing a real-time, rapid and efficient approach. The advantages and drawbacks of nondestructive techniques are emphasized for evaluating quality attributes of the fruit. The future prospects of using nondestructive techniques for quality evaluation have proven to be successful in the development of an automated sorting machine and an on-line detection system