Relationship Spectral Reflectance under Different Salt StressConditions of Tomato

This study was conducted to investigate effect of irrigation water salinity on energy usage of tomato plant. The experimentwas carried out in a completely randomized design under controlled greenhouse environment as a pot experiment.In addition to kontrol (S = 0.5 dS m-1) treatment, four different levels of saline irrigation water (S = 1.5, S = 2.2, S = 3.4,0 1 2 3S = 5.8 dS m^-1) were applied to tomato during growing period. Spectral measurements were made for each trial subject with handheld spectroradiometer which has a detection between 330-1075 nanometers wavelength interval. Furthermore, Vegetation Index (VI), Normalized Difference Vegetation Index (NDVI), Normalized Difference Salinity Index (NDSI) and Salinity Index (SI) values were calculated. Considering statistical analysis, significant relationship were found between plant reflectance and calculated index values in detecting salt stress. In conclusion, plant stres conditions caused by salinity on tomato was started in 16th weeks of plant growing period for the blue and red wavelengths and in 13th weeks for the green. Calculated VI, NDVI, SI and NDSI values were decisived in 12th, 14th, 16th and 14th weeks of plant growing period, respectively.