Effect of Cow Manure and Leonardite on Growth and Total Phenolic and Flavonoid Content of Kajeawdang (Curcuma sessilis Gage)
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Abstract
Kajeawdang (Curcuma sessilis Gage) is a wild plant belonging to the Zingiberaceae family. This research was aimed to study the effect of cow manure and leonardite on growth, phenolic and flavonoid compounds content of Kajeawdang. The experimental design was a Randomized Complete Block Design (RCBD) with 6 treatments and 3 replications. The result found that plants supplied with cow manure and leonardite ratio 1:1 have the highest result on the number of new shoots per clump 1.86, plant height 38.06 centimeters and number of leaves per plant 9.66 respectively. The leonardite and control treatment gave plant height, the number of new shoots and leaves was the lowest. The highest total phenolic compounds were found in plants supplied with cow manure mixed with leonardite ratio 1:1 treatment of 117.33 mg GAE/g of extract whose flavonoid contents were 396.33 mg catechin/g of extract. The lowest phenolic and flavonoid contents were found when plants were supplied with 100% leonardite and control treatment (sandy loam clay). Therefore, organic fertilizer of cow manure mixed with leonardite 1:1 by weight was the best growth promotion, increasing of phenolic compounds and useful for agriculture to grow Kajeawdang.
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