RELATIONSHIP BETWEEN SOLID- LIQUID ORGANIC FERTILIZATION AND SPECTRAL REFLECTANCE IN LETTUCE (LACTUCA SATIVA L.) GROWING

The aim of the study was to examine the effects of solid and liquid organic fertilization treatments applied to the lettuce plant from the base in increasing doses on energy use of electromagnetic spectrum in the range of different wavelengths. The study was conducted in a controlled greenhouse environment according to a randomized complete block design. Solid organic fertilizer (SOF) applied from the base at different doses, and liquid organic fertilizer (LOF) via drip irrigation were applied throughout the plant growth period. The treatments applied were as follows: KO= 0 kg.da-1 (SOF)-0 lt.da-1(LOF), U1= 0 kg.da-1(SOF)-20 lt.da-1(LOF); U2= 300 kg.da-1(SOF)-40 lt.da-1(LOF), U3=600 kg.da-1(SOF)-20 lt.da-1(LOF), U4= 0 kg.da-1 (SOF)-40lt.da-1 (LOF), U5=300 kg.da-1(SOF)-20 lt.da-1(LOF) and U6=600 kg.da-1(SOF)-40lt.da-1(LOF). Within this period, spectroradiometric measurements were obtained using a hand spectroradiometer in the range of 330- 1075 nm wavelength of electromagnetic spectrum. In addition to the relevant measurements, Vegetation Index (VI), Normalized Difference Vegetation Index (NDVI), Salinity Index (SI) and Normalized Difference Salinity Index (NDSI) calculations were also made. The results showed that the treatments and terms were statistically significant each week. The difference between the treatments was significant in the 4th week in the blue and near infrared wavelengths, and in the 5th week in the green and red wavelengths. Moreover, it was concluded that the impact of the treatment on VI, NDVI and NDSI values became significant in the 5th week, although significance was determined in the SI value in the 4th week.