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Influence of ethephon spraying on the growth and yield of Stevia (Stevia rebaudiana Bertoni.)
(2023-05-01)
Chumthong, B.
;
Seesanong, S.
;
Detpiratmongkol, S.
The effects of ethephon spraying on the growth and yield of stevia (Stevia rebaudiana Bertoni) was investigated. The results indicated that spraying ethephon for three times leaded to the highest growth parameters in term of stem, leaf, root and total dried weight and yield, followed by spraying two and one times. The ethephon spraying to stevia at concentration of 200 ppm gave the highest total dried weight and yield. It is concluded that application of ethephon at concentration of 200 ppm to stevia for three times at 30, 60 and 90 DAT gave the highest vegetative growth and yield.
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Influence of shading levels on growth, yield and andrographolide content of Kalmegh
(2020-04-01)
Liphan, Somanan
;
Detpiratmongkol, S.
We studied the growth, yield and andrographolide content of three local kalmegh (Andrographis paniculata (Burm. F.) Nees) responses to varying shade levels under green house conditions, from March to July 2018 in Thailand. Our experiment was laid out in a split plot design with three replications. Three local kalmegh varieties (Prachinburi, Nakhon Prathom and Saraburi) and four shading levels (0%, 25%, 50% and 75% shading) were applied to the test plots. Stem height, stem, leaf and root dry weight and leaf number per plant, seed and leaf dry weight yield and andrographolide content were recorded. The Prachinburi variety, followed by Nakhon Prathom and Saraburi, showed the strongest growth under all shade conditions. Different shading levels strongly influenced growth and kalmegh yield. The highest growth, stem, leaf, root, total dry weight, seed and leaf dry weight yield and andrographolide content were registered at 25% shading levels followed by 0%, 50% and 75% shading levels. We concluded that 25% shading and the local Prachinburi variety kalmegh should be recommended.
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Response of Kalmegh (Andrographis paniculata (Burm. F.) Nees) to shading at different growth stages
(2019-01-01)
Liphan, Somanan
;
Detpiratmongkol, S.
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.
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Influences of trinexapac-ethyl on development and sugar content of sorghum bicolor
(2019-01-01)
Yoosukyingsataporn, S.
;
Detpiratmongkol, S.
Result showed that no-interactions among the cultivars. The different trinexapac-ethyl doses and different periods of pre-harvest weeks provided significantly different sweet sorghum growth and yield at the p < 0.05. The control treatment provided the highest growth but low sugar yield. The trinexapac-ethyl ripener affected the highest growth and sugar yield when applied at 0.05 ppm and 1 pre-harvest week. On the other hand, trinexapac-ethyl (0.20 ppm) level inhibited the growth of sweet sorghum when applied at 5 pre-harvest weeks. At 0.05 ppm dose and 1 pre-harvest week, the chemical ripener provided the tallest plant height, biggest stalk diameter, juice extract, and sugar yields. Based on these findings, we recommended to apply the trinexapac-ethyl at 0.05 ppm dose by spraying 1 week before harvest. The sweet sorghum variety is recommended to be KKU 40 cultivar.
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Effects of sulfometuron-methyl as chemical ripener on growth and yield of three sweet sorghum cultivars
(2018-12-01)
Yoosukyingsataporn, S.
;
Detpiratmongkol, S.
The effect of sulfometuron-methyl as chemical ripener on growth and yield of three sweet sorghum cultivars was investigated. The results revealed that for three sweet sorghumcultivars, growth and yield of Ethanol 2 cultivar were largest and followed by KKU 40 and Cowley cultivars, respectively. Sulfometuron-methyl mainly affected on growth and yield of sweet sorghum. As different sulfometuron-methyl concentration levels, the increasing doses of sulfometuron-methyl concentration were decreased the growth and yield of sweet sorghum. Juice extract yield, brix degree and stem fresh weight yield of sweet sorghum were the largest at 1,000 mg lit -1 sulfometuron-methyl concentration when compared to the other concentration and control treatment. However, it was recommended that the most suitable application of sulfometuron-methyl was 1,000 mg lit -1 concentration with Ethanol 2 cultivar. In addition, all of the growth parameters, It was not found the interaction between sulfometuron-methyl concentrations and sweet sorghum cultivars.
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Response of biomass and yield of Stevia (Stevia rebaudiana Bertoni.) to flower removal
(2018-12-01)
Chumthong, B.
;
Detpiratmongkol, S.
It has never been reported on the effect of flower removal on the yield of Stevia plant. The effect of flower removal on growth and yield of Stevia was studied. Reesults revealed that flower removal produced significantly (P=0.05) greater number of leaves, dry biomass yield and leaf dry weight yield compared to the control. Four times of flower removal plant gave the highest number of leaves (1,318.50 plant -1 ), total biomass dry weight (11.31 g plant 1- ) and leaf dry weight yield (0.81 t ha -1 ) compared to the control. Therefore, flower removal during the production of Stevia plant should be practiced in order to increase growth and leaf yield.
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Effects of different harvesting times on growth, yield and quality of Kalmegh (Andrographis paniculata Wall Ex. NeeS)
(2018-12-01)
Detpiratmongkol, S.
;
Liphan, S.
The effect of harvesting times on growth, yield and quality of kalmegh were investigated. The results were disclosed that for three local kalmegh cultivars, stem and leaf dry weight and total dry weight of Prachinburi cultivar were the the highest and followed by Nakhon Prathom and Pitsanulok 5-4 cultivars, respectively. Leaf dry weight and seed dry weight yield of Prachinburi cultivar were the highest. Harvesting times affected on growth and yield of kalmegh. The highest leaf dry weight yield (13.59 g plant -1 ) and andrographolide content (2.54%) were recorded at harvesting times of 135 DAP but the highest seed dry weight yield was detected 170 DAP. However, it is recommended that harvesting times at 135 DAP in Prachinburi local kalmegh cultivar should be adopted.

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