Abstract:

In this study, the aim is to determine the nitrogen content of the tomato (Solanum lycopersicum) plant in controlled greenhouse conditions by hyperspectral methods. In the study conducted in thermal conditions, a portable spectroradiometer was used to make reflective measurements between 325-1075 nm wavelengths of the electromagnetic spectrum for spectral reflection measurements. In the study, two different species of fertilizer in the ammonium nitrate and ammonium sulfate form, 5 different doses were applied to the tomato plant. In a total of 120 trials, the sample was made in 4 different periods to be 3 wheels of each dose. In the determination of the N content of the tomato plant by hyperspectral detection methods, the spectral reflection graph of the tomato plants applied ammonium nitrate has been shown to work more in the visible area while ammonium sulfate applied can be better identified in the visible and near infrared area. In particular, ammonium nitrate and ammonium sulfate applications applied in the 4th period have increased their percentage of reflection in the visible area due to the reduced dose increase in both, so in this period the N content of the tomato plant can be determined.

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