Physiological responses of two local lemon grass cultivars to irrigation frequencies and amounts
2004
Somyot Detphirattanamongkhon(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Agricultural Technology. Department of Plant Production Technology) | Thawatchai Ubonkoet(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Agricultural Technology. Department of Plant Production Technology) | Sommat Yusukyingsathaphon(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Agricultural Technology. Department of Plant Production Technology)
Aims of this study was to determine the effects of irrigation frequencies and amounts on some physiological characteristics of two local lemon grass cultivars. The experiment was conducted under field condition at the Faculty of Agricultural Technology, KMITL during December 14, 2000 to June 24, 2001. Split-split-plot in a randomized complete block design with three replications was employed. Two lemon grass cultivars, Ta-kai-gua (Cymbopogon citrates) and Ta-kai-haum (Cymbopogon nardus), were subjected to three irrigation intervals (i.e. 3,7 and 15 days) and three water amounts (i.e. 20, 30 and 40 mm of water equivalent to rainfall, repectively). It was found that there were no relationships among lemon grass culitivars, irrigation intervals and amounts. In addition, no differences in leaf temperature, leaf water potential and total dry weight yield between the two lemon grass cultivars. Total conductance of Ta-kai-haum was greater than Ta-kai-gua at 30 days after planting (DAP) but transpiration rate of ta-kai-haum was lesser than Ta-kai-gua at 90 DAP. The lower water amounts and less frequent irrigation intervals decreased diffusive conductance of stomata, transpiration rate, leaf water potential and total dry weight yield whereas leaf temperature was increased.
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