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diameter variations over time, based on a low-cost linear potentiometer. The sensor is described, and data on the signal stability over a range of temperatures and from an actual study of fruit growth physiology are provided as a example of the potential of

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Abstract

A sensor for measuring photosynthetically active radiation was constructed using a silicon photocell in combination with a glass absorption filter. A trimmer potentiometer was used for standardization of sensor output. The sensors were calibrated using a commercially available quantum sensor. Average correlation coefficient between constructed sensors and the standard was 0.94. The sensors had a quantum response, were sensitive only in the wavelengths between 400 and 700 nm, exhibited a linear response to varying PAR light levels, and were inexpensive to construct.

Open Access

potentiometer; Barloworld Scientific, U.K.). Plants were harvested and separated into roots, leaves, stems, and fruits. Vegetative plant parts were bagged and placed in an oven at 70 °C for 72 h before measuring dry mass (DM). Total yield was measured by

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, and the solution was again mixed and incubated 2 h at room temperature. Samples were measured at an absorbance of 765 nm and expressed as milligrams gallic acid equivalents (GAE) per 100 g FW. Measurements of pH were made using a potentiometer

Open Access

water potentiometer (WP4; Decagon Devices, Inc., Pullman, WA) according to the manufacturer’s manual and description by Fan et al. (2015) . Average monthly precipitation of the last decade (2009–19) were obtained from the Florida Automated Weather

Open Access