Accurate Measurement of Photosynthetically Active Radiation

Apogee Instruments has released several new products in the recent past, including: leaf chlorophyll meter that outputs chlorophyll concentration in units of umol chlorophyll per m² of leaf surface, quantum sensor with an improved spectral response for more accurate PAR measurements, quantum sensor that uses USB to connect directly to a computer or small power supply and has internal memory for logging data, and small weatherproof spectroradiometer that interfaces with a datalogger or computer and is designed for longterm deployment. Details of these products and application to horticulture will be discussed.