Effects of humic acid on growth and development of melon in nutrient solution culture
Main Article Content
Abstract
A study on the effects of humic acid on vegetative growth and physiological changes of melon (Cucumis
melo L.) was investigated. The melon seedlings were grown in nutrient solution culture and established in the
greenhouse from December 2022 to February 2023 at the Agricultural Technology Research Institute, Rajamangala
University of Technology Lanna, Lampang, Thailand. The experiment was carried out using a completely
randomized design (CRD) with six treatments and ten replications, including 0 (control), 25, 50, 100, 150, and 200
mg/L of humic acid, respectively. The result showed that humic acid treatments affected the vegetative growth of
melons. The application of humic acid at 50 mg/L gave greater plant height, leaf width, and leaf length than other
treatments. The 25 and 50 mg/L humic acid enhanced leaf green color index (SPAD) and chlorophyll fluorescence
of melon trees. However, increasing humic acid at 100-200 mg/L reduced vegetative growth and chlorophyll
fluorescence.
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