MONITORING WATER AND HEAT STRESS OF LETTUCE CROP BY USING INFRARED THERMOGRAPHY TECHNIQUE.

The objective of this study was the possibility of using infrared thermography IR to detect and continuously monitor for lettuce plants growing conditions. Also, discernment plants stresses under the shortage of nitrogen and irrigation water. The results showed for Lettuce plants, At the level of fertilization (0%), the maximum values of lettuce the lowest values for MTD maximum temperature difference, and normalized relative canopy temperature NRCT were 0.673 and 0.1 °C at irrigation systems ETC 100% and ETC 50% and nitrogen fertilization systems at 0% level.. And ETC 50% and systems and nitrogen fertilization level 100%. In the fourth level of fertilization (150%), the maximum value of leaf temperature was 24, 23, 22.5, and 23 °C and NRCT was 5.5 and 3.5 °C, and the lowest values for MTD and NRCT were 0.82, 0.28 °C, and 0.018 °C at 0.018 °C. Irrigation ETC 100% and ETC 50% and systems and nitrogen fertilization standard 150%. Also crop water stress index increased from 0.18. at the initial stage to 0.4. and at rapid stage, mid-season stage, and late season stage increased from 0.28 to 0.45, from 0.3 to 0.5, and from 0.31 to 0.59 respectively at constant irrigation level (0%) and the fertilization level from 0 % to 100%, also the index of stomatal conductance with the same trend the crop water stress index increased from 0.51. at the initial stage to 1.26. and at rapid stage, mid-season stage, and late season stage increased from 0.36 to 2.14, from 0.93 to 3.52, and from 0.95 to 5.52 respectively at constant irrigation level (0%) and the fertilization level from 0 % to 50%. [ABSTRACT FROM AUTHOR]