Kanokkorn Piromsri creator Datta, Avishek Chairperson Zulfiqar, Farhad Examination Committee Ullah, Hayat Examination Committee Royal Thai Government Fellowship Scholarship Donor text series theses th Pathum Thani, Thailand Asian Institute of Technology 2021 continuing eng

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121 leaves : ill. + 1online resource At present, climate change has become the main issue around the world. It can threaten food safety and various crops which are major food sources of the world{u2019}s living things. Also, It can make many farmers face more challenges that can make farmers manage crops more difficult. Drought is environmental stress and become widespread in many areas; in addition, drought is the main threat to agricultural productivity. Tomato is an essential vegetable and has the highest area under cultivation among vegetables of the world. It was widely cultivated and consumed worldwide for its usefulness. However, both vegetative and reproductive growth of tomato can be severely affected by drought stress, such as inhibits seed development, reduces vegetative growth and compromises reproduction. Seaweed extracts is biostimulant can enhance soil health by improving moisture-holding capacity and by promoting other nutrients and the growth of beneficial soil microbes. In this study, the independent pot experiment was conducted to find out the best soil application of seaweed extract (Ascophyllum nodosum) on growth, fruit yield, quality, physiological traits of tomato. Seaweed extract was applied in five concentrations (0, 2.5, 5, 10, and 20 mL L-1 ) under three soil moisture regimes (100%, 75%, and 50% field capacity [FC]). Severe soil moisture stress at 50% FC resulted in 67% decrease in fruit yield, 10% decrease in fruit length, 47% reduction in the number of fruit plant-1 , 33% reduction in irrigaion water productivity compared with 100% FC. Soil application of seaweed extract at 5mL L-1 was effective at all soil moisture levels. Soil application of seaweed extract at 5 mL L-1 resulted in 225% higher fruit yield in comparison with no application of seaweed extract at 50% FC. Tomato was a significant increase in growth and fruit yield when seaweed extract was applied at 5 mL L-1 as a soil application. In addition, The beneficial effects of 5 mL L{u2013}1 seaweed extract dose was also evident in fruit quality and physiological parameters of tomato. The result of this study indicates that 5 mL L -1 could be regarded as an optimum concentration of seaweed extract for tomato applied as a soil application. Thus, soil application of seaweed extract at 5 mL L {u2212}1 is effective to improve plant growth, fruit yield, fruit quality, physiological traits and imparting drought tolerance, moreover, seaweed extracts are considered organic substances as they are environmentally benign and safe for the health of animals and humans. A Thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Agricultural Systems and Engineering Thesis (M. Sc.) - Asian Institute of Technology, 2021 Plants Effect of stress on Plants Drought tolerance Tomatoes Marine algae Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B21679 http://203.159.5.9/ait-thesis/detail.php?q=B21679 241003 20260818134412.0