Investigation of the Determination of Nitrogen Content with Hyperspectral Detection Techniques in Tomato

The aim of the study was to determine the nitrogen content of tomato (solanum lycopersicum) under controlled greenhouse conditions by hyperspectral methods. the study was carried out in the greenhouse conditions. a portable spectroradiometer capable of reflectance measurements between 325-1075 nm of the electromagnetic spectrum was used for spectral reflection measurements. in this study, two different fertilizer types, ammonium nitrate, and ammonium sulfate were applied to tomato seedlings in 5 different doses. the experiment has consisted of 120 pots in total which 3 replications of each dose have been sampled in 4 different periods. the spectral reflection graph of tomato seedlings which applied ammonium nitrate was shown more acceptable values in the visible region, whereas the ammonium sulfate applied samples could be determined better in the visible and near-infrared region. especially in the 4th period, the reflectance percentages were increased in the visible region due to the decreasing dose. it could be determined the n content of the tomato seedlings in this period.