Desenvolvimento de um sistema embarcado para obtenção do índice de área foliar por inversão da radiação fotossinteticamente ativa

Abstract

The obtaining of the Leaf Area Index (LAI) is of great importance in the understanding and monitoring of plant responses to different atmospheric stimuli. However, direct methods are destructive and require intense labor and time. In this sense, this work aimed the development of an embedded system to obtain LAI by inversion of photosynthetically active radiation. The developed system has a main module for the control and storage of the media, a probe for the reading of the Photosynthetically Active Radiation (PAR) transmitted through the canopy and an external module that obtains the PAR incident above the canopy and remotely sends the measurements to the main module, thus obtaining the LAI with simultaneous measurements of the PAR. When comparing the developed system with commercial equipment, a high statistically significant correlation was observed (r = 0.9743), an MAE of 0.3767, RMSE of 0.4372 and a Willmott coefficient (d = 0.9816) indicating a high correspondence between the LAI values obtained with the developed system and the commercial equipment.