Khurnpoon, Lampan

Preferred name

Khurnpoon, Lampan

Alternative Name

Khurnpoon, L.

Main Affiliation

School of Agricultural Technology

lampan.kh@kmitl.ac.th

Now showing 1 - 10 of 18

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Small scale method for estimation of genetic coefficients of photoperiod-insensitive rice using generalized likelihood uncertainty estimation
(2023-03-01)
Suanphrom, Nattawut
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Khurnpoon, Lampan
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Phakamas, Nittaya
Importance of the work: Genetic coefficients are important parameters for simulations of rice yield performance in crop growth models. Most genetic coefficients (GCs) are obtained from large experiments. Objectives: To estimate the GCs of seven photoperiod-insensitive rice cultivars for four planting dates in a pot experiment. Materials & Methods: Input data (soil, weather, management, plant parameters) were collected and used to calibrate the GCs of seven rice cultivars using the GLUE estimator in the DSSAT version 4.7 package. The data were collected from four planting dates: 1) 23 Nov 2019; 2) 23 Dec 2019; 3) 23 Jan 2020; and 4) 23 Feb 2020. The data from planting dates 1, 3 and 4 were used for calibration of the GCs, whereas the data from planting date 2 were used for evaluation of the GCs. Results: Good prediction qualities of the model for most cultivars were indicated for days to anthesis and days to physiological maturity; however, there were poor prediction qualities for almost all cultivars for their biomass and grain weight. Main finding: This information should be useful for further investigations of GCs in rice. Although the results were contrary to the initial hypothesis, the method showed promise for further use in rice modeling research if the method can be improved by experimental management, the use of suitable reference plants for each cultivar and running the model for an appropriate cycle. It was possible to obtain some reliable GCs from small-scale experiments, so the experiment should be improved to obtain better results. Further investigations should focus on the optimum scale and weather data specific to experimental sites.
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The correlation between total phenol and antioxidant capacity of sweet potato (Ipomoea batatas L.) with varying flesh color
(2012-04-01)
Khurnpoon, L.
;
Rungnoi, O.
The study established baseline data on the total phenol content and antioxidant activities of 36 sweet potato (Ipomoea batatas) cultivars with distinctive flesh color (white, yellow, orange and purple) grown in Pijit Province in the northern part of Thailand. Total phenol were measured using the Folin-Ciocalteau method while antioxidant capacity in sweet potato flesh was measured by 2,2- diphenyl-1-picrylhydrazyl (DPPH). Total phenol content ranged from 75.47- 1,283.37 ?g gallic acid equivalent (GAE) g-1 dry weight. The highest phenolic content was found in cultivar 'PJ25' (purple fleshed) and lowest in cultivar 'PJ18' (orange fleshed). Antioxidant capacity in different flesh color ranged from 72.1-84.56% of DPPH inhibition. The highest total phenol was concomitant with the highest antioxidant activity which was 84.56% for DPPH radical scavenging activity on a dry weight in cultivar 'PJ25'. Significant (*P<0.05) positive correlation was observed between total phenol content and antioxidant capacity (%inhibition) for DPPH radical scavenging activity in white (R2=0.652), yellow (R2=0.5386), orange (R2=0.6518) and purple (R2=0.899) fleshed sweet potatoes.
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Change in fruit quality and cell wall polysaccharides in bruised papaya cultivars 'Khak dum' and 'Holland'
(2012-04-01)
Khurnpoon, L.
;
Siriphanich, J.
Papaya bruising is a major postharvest problem that substantially reduces fruit quality. During the process of ripening, Thai papaya 'Khak dum' is softer than imported cultivar 'Holland' (Pak Mai Lai). 'Khak dum' is more susceptible to bruising than 'Holland'. Due to lack of detailed knowledge about bruising mechanisms, effective bruise prevention is difficult. Pulp firmness at bruised site were approximately 60 and 30 N before impact then rapidly dropped to about 30 and 20 N after 2 days following impact, while it dropped to about 45 and 28 N in control for 'Khak dum' and 'Holland', respectively. The bruised tissues expanded, became darker in color to larger bruise areas of 20.42 and 24.09 cm2, respectively and decayed 2 and 4 days following impact. Respiration rate also increased by 1.5-times in 24 h following impact then declined. Soluble solids content was not significantly different between bruised and control fruit, but slightly increased by the end of storage. Pulp softening at the bruise area was associated with the increase in water soluble pectin fraction approximately 3 and 1.5 times as compared to the control in 'Khak dum' and 'Holland', respectively, while CDTA and 4 M KOH soluble fractions slightly decreased by the end of storage. Na2CO3 slightly increased in 'Khak dum' while it decreased in 'Holland'.
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Distribution and management of total and available sulfur under durian orchard soils in the Eastern Thailand
(2021-09-01)
Jaisue, N.
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Tawinteung, N.
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Worphet, A.
;
Khurnpoon, L.
Sulfur is necessary plant nutrient but is rarely determined on a routine basis because of interpretive and analytical problems resulted in the lack of consistent identification of S sufficiency or deficiency in soils. Sulfur status of durian orchard soils in the Eastern Thailand was evaluated for plant availability. The result indicated that total S ranged from 315 to 1340 mg/kg (average 813 mg/kg) which 93-99% was in organic form and relatively the same comparison between topsoil and subsoil. Total S was significantly correlated with C (r = 0.41**), N (r = 0.36**), pH (r = -0.52**) and SOM (r = 0.51**). The C:S and N:S ratios varied from 7.8-54.8 and 0.74-4.67 respectively, indicating the dominance of the mineralization process toward sulfur nutrition. C:N:S was 20:2:1 due to heavy S fertilizer application. Extractable S (available S) was varied from high to very high ranged depending on soil standard, of which about 75% of soil samples were classified to be no response to S application. Out of the average available S of 24.2 mg/kg the topsoil (28.2 mg/kg) was higher than subsoil (25.6 mg/kg). Available S showed very closely correlation to total S (r = 0.72**), C (r = 0.61**), N (r = 0.57**), pH (r = -0.29**) and SOM (r = 0.61**). Stepwise multiple regression showed that approximately 73.0% variation in the extractable or available S could be explained in terms of several soil parameters.
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Production Performance and Adoption Opinion Toward Wet and Dry Farming of GAP and Non-GAP Farmers in Suburban Bangkok, Thailand
(2024-03-01)
Suwanmaneepong, Suneeporn
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Kultawanich, Kulachai
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Khurnpoon, Lampan
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Sabaijai, Phatchara Eamkijkarn
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Kerdsriserm, Chanhathai
Technology adoption requires technical information to support decision-making and encourage broader acceptance. Recognizing the significance of alternate wetting and drying technology in sustainable agriculture, this study aims to promote the adoption of this technology among both Good Agricultural Practices (GAP) and non-GAP farmers in Suburban, Bangkok, Thailand. Data were collected through a structured questionnaire, which gathered information on farmers' cost and return values, as well as their adoption opinions. The collected data were then analyzed using cost and return analysis, as well as stochastic frontier analysis. The results indicate that non-GAP farmers face significantly higher total costs due to increased fixed costs compared to GAP farmers. While there were no significant differences in yield between the two groups, GAP farmers achieved significantly higher total income and net profit due to lower total costs and higher selling prices. Furthermore, the analysis suggests that both groups of rice farmers have the potential to improve their efficiency levels, with non-GAP farmers showing a higher potential for improvement. In terms of adoption opinion, both farmer groups recognize the advantages of wet and dry farming technology over traditional flooded rice farming. This study highlights that the adoption levels of both GAP and non-GAP farmers can be significantly improved through the implementation of best management practices. Overall, the findings emphasize the importance of trustworthy information dissemination to encourage the adoption of wet and dry farming technology, as it enhances farmers' trust in the received information and their engagement with the technology. The study concludes by providing policy implications and recommendations to promote the wider adoption of wet and dry farming technology.
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Rapid measurement of classification levels of primary macronutrients in durian (Durio zibethinus Murray CV. Mon Thong) leaves using FT-NIR spectrometer and comparing the effect of imbalanced and balanced data for modelling
(2022-11-15)
Phanomsophon, Thitima
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Jaisue, Natthapon
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Worphet, Akarawhat
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Tawinteung, Nukoon
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Shrestha, Bijendra
For durian growth to produce high-quality fruit, plants should receive sufficient nutrients. Currently, farmers apply various fertilisers to produce a large quantity and quality of durian fruit, irrespective of the actual nutrients that the plant requires. Accordingly, the production cost is high and non-renewable resources. Therefore, this study focused on rapid classification primary macronutrient levels in durian (Durio zibethinus Murray CV. Mon Thong) leaves using Fourier transform near-infrared (FT-NIR) spectroscopy and investigated the effect of imbalanced data on efficient classification models. Contents of N, P, and K in durian leaves were measured via NIR with the wavelength range of 800–2,500 nm. Classification models were developed using partial least squares, k-nearest neighbour, and artificial neural networks (ANNs) with imbalanced and balanced data. The imbalanced data were balanced using a synthetic minority oversampling technique (SMOTE). In this study, the model regarding the fresh leaf sample performed better than that for the dried ground leaf sample. Moreover, the ANN was the best algorithm, exhibiting validation accuracies of classified levels corresponding to N = 0.99 and P = 0.97 when the data were analysed with SMOTE and K = 1.00 from the original balanced data. The imbalanced data affected biased classification when the models could increase the classification accuracy by applying balanced data for modelling.
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Insecticidal activity of essential oil formulas and their physiological effects on eggplant
(2017-05-01)
Pumnuan, Jarongsak
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Khurnpoon, Lampan
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Insung, Ammorn
This study examined fumigation toxicity of 18 medicinal plant essential oils (EOs) against adult of aphid (Aphid gossypii) and whitefly (Bemisia tabaci). Then, non-target effects of the EO mixtures on physiological changes of eggplant (Solanum melongena) were tested. The insecticidal property and physiological toxicity of the fumigation formulas were also examined and compared to methyl bromide (MB) fumigation. The results showed that the eggplant fumigated with clove (Syzygium aromaticum) and lemon grass (Cymbopogon citratus) EOs mixture at the ratio of 1:3 (Cl1Le3) showed no significant physiological changes when compared to the control treatment. The formula resulted in similarly high mortalities (82-100%) of both insects when compared to MB. However, MB fumigation caused complete senescence appeared before day 3 observations. On the contrary, the eggplant fumigated with Cl1Le3 at 3 μL/L air showed no differences in the physiological changes when compared to the control throughout the 9-day examinations.
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Quality change on holy basil after fumigation with insecticidal essential oil formula from clove and cinnamon
(2018-04-04)
Pumnuan, J.
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Khurnpoon, L.
;
Insung, A.
The essential oil formula from clove (Syzygium aromaticum) and cinnamon (Cinnamomum bejolghota) at the ratio of 1:3 (Cl1Ci3) has been recently considered as an effective alternative fumigant against thrips (Thrips palmi) and aphid (Aphis gossypii), which are the major pests attacking exported holy basil (Ocimum sanctum) in Thailand. This study aimed to investigate the effects of the C1Ci3 formula used as fumigant on physical quality of holy basil compared to methyl bromide application. The percentage of insect mortality and change in L*, a* and b* values, as well as weight loss of holy basil, were determined. All fumigations in this study were conducted using the formula Cl1Ci3 at the concentrations of 0.0, 2.0 and 3.0 mL m-3 for 2 h with 15-min air circulation in 1 m3 fumigation chamber and compared to methyl bromide at 20 g m-3 (recommended concentration). The observations of insect mortality were conducted at 24 h after treatment. The holy basil samples were evaluated prior to the treatments, immediately after the treatments, and after 3 and 6 days at 25±1°C. The methyl bromide fumigation showed 100% mortality of all insects and its efficacy was significantly higher than that of the Cl1Ci3 formula (73.9-96.0%). Leaf burning was observed immediately after methyl bromide fumigations. On the other hand, no significant physiological changes were observed on plants fumigated with the Cl1Ci3 formula, as compared to the control.
2
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Evaluation of physiological properties and texture traits of durian pulp using near-infrared spectra of the pulp and intact fruit
(2021-04-01)
Onsawai, Phalanon
;
Phetpan, Kittisak
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Khurnpoon, Lampan
;
Sirisomboon, Panmanas
This study aimed to investigate the feasibility of non-destructively predicting physiological properties (color, dry matter, and soluble solids) and texture properties (initial firmness, average firmness, rupture force, rupture distance, toughness, average penetrating force, and penetrating energy) of ‘Monthong’ durian using Fourier transform near-infrared spectroscopy of the pulp of the largest locule, the intact fruit at the largest locule, and the stylar end of the intact fruit. Based on partial least squares regression modeling, the internal quality evaluation of durian obtained by scanning the pulp could provide rough screening capability, with coefficient of determination of validation (r2), root mean square error of prediction (RMSEP), and the ratio of standard error of validation to standard deviation (RPD) values for the dry matter content, average penetrating force, and rupture force of 0.89, 3.60%, and 3.27; 0.73, 5.53 N, and 1.95; and 0.74, 6.15 N, and 1.96, respectively. Only the dry matter content of the pulp could be reasonably predicted based on scanning the intact durian fruit at the largest locule, with r2, RMSEP, and RPD values of 0.79, 5.23%, and 2.18, respectively. This finding could be applied at the first stage of trade between durian agriculturalists and exporters to prevent the exportation of immature durian and would be helpful for the industries producing frozen durian pulp and intact durian fruit for export.
3
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Changes of cut orchid quality after fumigation with clove and cinnamon essential oils
(2015-03-25)
Pumnuan, J.
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Khurnpoon, L.
;
Insung, A.
Clove and cinnamon essential oils have been recently considered as effective alternative fumigants against thrips and mealybug, which are the major pests infecting exported orchid cut flowers in many countries. Therefore, this study aimed to investigate effects of clove and cinnamon essential oils in non-targeted fumigation on Dendrobium orchid cut flower. Changes in L∗, a∗ and b∗ values, weight loss, polyphenoloxidase (PPO) activity, total phenolics and anthocyanin content were determined. All fumigations in this study were conducted using the essential oils at the concentrations of 0.0, 3.0 and 6.0 ml/m3 for 1 h with 15-min air circulation in 1-m3 glass chambers. The effects of eugenol under the same conditions were examined. The samples were evaluated prior to the treatments, immediately after the treatments, and 3 d after the treatments at 25±1°C. The results showed a decrease of L∗ and a∗ values, and anthocyanin content in all groups, while b∗ value, percentage of weight loss and total phenolic content increased. PPO activity did not change throughout the sampling period. Remarkably, the orchids fumigated with clove and cinnamon essential oils, and eugenol at 3.0 ml/m3 did not differ from the control. However, fumigations at 6.0 ml/m3 reduced flower quality, leading to increased weight loss and petal discoloration.
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Khurnpoon, Lampan

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