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Response of Kalmegh (Andrographis paniculata (Burm. F.) Nees) to shading at different growth stages
Author(s)
Liphan, Somanan
Detpiratmongkol, S.
Date Issued
January 1, 2019
Type
Article
Abstract
Kalmegh (Andrographis paniculata (Burm. F.) Nees) is a very useful medicinal herb widely used for treatments of various human diseases and symptoms: fever, cold, laryngitis, diarrhea and inflammation. However, its enhanced growth and yield as a response to shading at different growth stages have not been studied yet. Therefore, in this study, an experiment was undertaken, from January to April 2018, to investigate the effects of shading at different growth stages on the growth, yield and quality of kalmegh. The design of this pot experiment was split plot with three replications; three local kalmegh cultivars—Prachinburi, Phichit 4-4 and Phisanulok 5-4—were the main plots. The four sub-plots were 20% shading at 3 stages of growth viz: 30, 60 and 90 days after planting (DAP) till harvest and no shading which was the control. Several agronomic characteristics of kalmegh such as plant height, stem, dry weight of leaf and root, total dry weight and leaf dry weight yield were recorded. The results indicated that Prachinbuti cultivar gave the tallest plant and stem heights as well as the highest dry weight of leaf and root, total dry weight and leaf dry weight yield, followed by Phisanulok 5-4 and Phichit 4-4. Shading at different stages of growth clearly affected the growth and yield of kalmegh. No shading resulted in the least growth and yield while shading at 90 DAP promoted some growth and yield that was higher than no shading but lower than shading at 30 and 60 DAP. The maximum values of growth and yield were observed under 20% shading at 30 DAP.
Citation
Plant Archives, 19(2), 2093-2098, 2019