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Chiang Mai, Thailand

Limtrakarn W.,Thammasat University | Boonmongkol P.,Thammasat University | Chompupoung A.,Royal Project Foundation | Rungprateepthaworn K.,National Electronics and Computer Technology Center | And 2 more authors.
Advances in Mechanical Engineering | Year: 2012

Natural flow rate and sweet peppers productivity in tropical greenhouse are improved by CFD simulation is the main objective of this research work. Most of the greenhouse types today are in the arch shape. To develop an improved greenhouse structure for the region, the arch type was built and used as the control model. Mae Sar Mai agriculture research station under the royal project foundation was selected as the field test site. Temperature sensors with data logger were installed to monitor variation of temperature inside the greenhouse. The measured temperature data were used as the boundary conditions for the CFD analysis. A new greenhouse model with two-step roof shape was designed and the air flow behavior was simulated by using CFD. Regarding CFD results the air flow rate of the new model is about 39 higher than that of old model. The maximum temperature of the new model is lower than that of the old one. The sweet paper growths in both greenhouse models were measured and compared. Results show that the new model obtains 4C lower maximum temperature in day time, 97 in number and 90 in weight higher the first grade pepper productivity than the old one. Copyright © 2012 W. Limtrakarn et al. Source


Wannakrairoj S.,Kasetsart University | Meesakul P.,Royal Project Foundation
Acta Horticulturae | Year: 2014

Ixora, a popular woody bedding plant, has many flower colors. Besides its bright flower color, there is another interesting mutant trait of pleated leaf. To conduct a successful improvement program to create a hybrid of commercial interest, a breeder ought to have inheritance knowledge of the trait of concern. A hybrid between a red flower with pleated leaf Ixora coccinea 'Bangkok Bow', a mutant, and a yellow flower with normal leaf Ixora chinensis 'Singapore Yellow' was made. Flowers of all progeny of the interspecific hybrid had orangish red color, with co-existence of red and yellow pigments. However, the population segregated into two leaf forms, suggesting a qualitative trait. The test cross ratio of 1:1 for normal leaf-to-pleated leaf was confirmed by Chi-square test. Thus, the mutant leaf form is a dominant trait. Source


Kunkaew W.,Royal Project Foundation | Julsrigival S.,Royal Project Foundation | Tipparat P.,Regional Medical science Center | Pinmanee S.,Highland Research and Development Institute Public Organization
Sabrao Journal of Breeding and Genetics | Year: 2011

Selection for reduced Δ 9-tetrahydrocannabinol (THC) content in four Thai hemp cultivars (including V50, Mae Sa Mai, Huay Hoi and Pang Ung) was carried out in highland areas in the northern Thailand. Research work was conducted for two consecutive growing seasons during 2008 to 2009 at Pangda Royal Agricultural Station, Samoeng district, Chiang Mai province, Thailand. Results of selection indicated that after selecting for two successive generations, the average THC content of four Thai hemp cultivars reduced to 18.0-55.0% and cannabidiol (CBD) content increased to 20.0-127.0%. The results of selection also indicated that chemotype classification could be grouped by using the ratio of CBD/THC content as follows: non-drug type (CBD/THC>10.0), intermediate type (1.0≤CBD/THC≤10.0) and drug type (CBD/THC<1.0). Thus, selection for reduced THC content, high ratio of CBD/THC content could be used as alternative criteria for improving low THC content in hemp cultivars. As well, mass selection method was considered as an effective and suitable method for improving these THC and CBD traits. Source


Boonyakiat D.,Chiang Mai University | Poonlarp P.B.,Chiang Mai University | Chuamuangphan C.,Chiang Mai University | Chanta M.,Royal Project Foundation
Acta Horticulturae | Year: 2015

Appropriate postharvest management to reduce losses of vegetables in the Royal Project Foundation was conducted by surveying and gathering information on supply chain of five vegetables, namely pointed cabbage, baby Chinese cabbages (pak-choi), bi-colored sweet corn, chayote shoot and Japanese cucumber. Postharvest losses of vegetables were determined at each stage of the supply chain starting from Chiang Mai province through Bangkok; in the field after harvesting, at the Development Center packhouse, at Chiang Mai packhouse, at Bangkok packhouse and at the Royal Project retail shop in Bangkok. The results showed that for pointed cabbage, Chinese cabbage, sweet corn postharvest losses were 63.79, 59.14 and 3.85%, respectively. Postharvest losses of chayote shoot were 39.37%, which were mainly due to wilting. The main factor contributing to losses of Japanese cucumber (59.11%) was due to produce not meeting the required market standard. After applying appropriate postharvest management, for example, temperature control, hygienic cleaning, using active packaging and reducing the duration of the supply chain, postharvest losses of all vegetables were remarkably reduced. Source

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