Calibración de un prototipo para realizar mediciones continúas de radiación fotosintéticamente activa en sorgo

This research aimed to calibrate the operation of a prototype for continuous measuring of photosynthetically active radiation (PAR) and validate it with field tests in sorghum cultivation (Sorghum spp.) at the final stage of its development. The prototype developed is based on two probes with 80 sensors (photodiodes). For calibration purposes, the output of this prototype was compared with a commercial sensor AccuPAR model LP-80 PAR/LAI Ceptometer (Decagon Enterprise), this calibration is explained by the slope of a linear regression model. The results obtained were a slope of 6.22963 μ mol m-2s-1 (mV x 102)-1 with a coefficient of determination of 0.997, which met the statistical assumptions at 95%. In addition, the map of variability in the field is presented, whose values range from ≤ 794.4 to 2 160 μ mol m-2 s-1, with the lower limit indicating that there is more foliage and the upper limit less foliage. From the data generated by the prototype, similarities to the commercial sensor were observed, suggesting that the prototype collects the data in less time and with greater sampling coverage, taking advantage of the window of opportunity of the diurnal solar radiation cycle.