Experimental investigations of different factors influencing on stability of laser induced fluorescence spectra of plants were conducted for 532 nm wavelength of fluorescence excitation. The experimental setup was described and processing results of laser induced fluorescence spectra of plants were presented. Stability of the fluorescence intensity ratio R at wavelengths of 685 and 740 nm versus type of soil, and wide variance of the R ratio for different plants were demonstrated.
Experimental laboratory investigations of the laser-induced fluorescence spectra of watercress were conducted. The fluorescence spectra were excited by a YAG:Nd laser emitting at 532 nm. The laboratory setup was described and fluorescence spectra of watercress in stressed states caused by lack and excess of water were presented. It was established that the influence of stress caused by lack and excess of watering is manifested in changes of fluorescence spectra.
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