Office of Agricultural Research and

Khlung, Thailand

Office of Agricultural Research and

Khlung, Thailand

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Jantee C.,Chanthaburi Horticultural Research Center | Hama J.,Office of Agricultural Research and | Sangudom T.,Horticultural Research Institute | Saradhuldhat P.,Kasetsart University
Acta Horticulturae | Year: 2014

This research aimed to investigate some cultural practices affecting yield and ×uality of fresh pineapple fruit production for export. The experiments were conducted at Chanthaburi Horticultural Research Center during October 2007- September 2010. Three pineapple cultivars, 'Trat Si Thong', 'Sawi' (Queen group) and 'Pattawia' (Smooth Cayenne group), were examined. Plant densities were 28,100, 34,400, 40,600 and 46,900 plants/ha for 'Trat Si Thong' and 'Sawi' and were 46,900, 56,300, 65,600, 75,000 plants/ha for 'Pattawia'. Fertilizer application was carried out following Good Agricultural Practice (GAP) recommendation or GAP+calcium application. The crown removal was conducted a week after the last flower bloom. The results revealed that to obtain marketable fruit at about 900 g per fruit, the optimal plant density was 46,900 plants/ha for 'Trat Si Thong' and 'Sawi' and 75,000 plants/ha for 'Pattawia' yielding 43.1, 36.3 and 74.4 t ha-1, respectively. The fertilizer application as GAP+foliar or soil dressing of fertilizer, 15-0-0+26.3 Ca, could not reduce internal browning after storage at 13°C for 21 days. The symptoms exist as 88, 19 and 13% in 'Trat Si Thong', 'Sawi' and 'Pattawia', respectively. The crown removal resulted in little crown size and fruit sun-burn, particularly in 'Trat Si Thong' and 'Sawi' and internal browning in 'Pattawia'. Without crown removal, fruit percentage of Extra, Class I or II increased to 94 and 80% in 'Trat Si Thong' and 'Sawi'. However, the internal fruit ×uality was not influenced by the plant density, fertilization and crown removal.


Apai W.,Office of Agricultural Research and | Likhittragulrung S.,Office of Agricultural Research and | Jaroensuk S.,Office of Agricultural Research and | Jarintorn S.,Research Center Mueang | And 3 more authors.
Acta Horticulturae | Year: 2014

Dipping in hydrochloric acid (HCl) for improving fresh longan fruit quality and consumer acceptance was investigated as an alternative to sulphur dioxide (SO2) fumigation. The fruit with panicle attached was placed in 11.5 kg commercial perforated plastic basket. The first experiment was carried out to reduce the contact time during dipping and rinsing process by increasing the concentration of HCl. The evaluation of different HCl application techniques showed that dipping in 6.4% HCl (pH 0.03) for 5 min then draining for 10 min without rinsing in water and stored immediately in cold room provided the best compromise between controlling fruit browning and decay and maintaining eating quality. Another experiment was to find out the optimum storage temperatures after dipping in HCl. The fruit placed in four baskets (46 kg in total weight) was dipped in 200 L of 6.4% HCl for 5 min and drained for 10 min. They were stored at 3, 10 and 30°C for 30 days. This treatment was compared with the fruits treated with SO2 treatment. It was found that the fruits treated with HCl and SO2 held at fluctuating temperature (30°C) decayed after five and ten days. Dipping in HCl and storage at 3°C was most suitable to store longan. This condition decreased pericarp browning and disease incidence and maintained consumer acceptance for 30 days; however, SO2 treatment had the highest score for consumer acceptance. There was no significant difference in total soluble solid, titratable acidity and flesh pH in HCl and SO2 treatments during storage. This HCl treatment is a potential tool to control postharvest losses and therefore increase the market life of fresh longans.


Poolperm N.,Office of Agricultural Research and | Thipmuangprom S.,Office of Agricultural Research and | Sirikanatayakul C.,Office of Agricultural Research | Somsa-ard S.,Phusing Agricultural Development Center | And 7 more authors.
Acta Horticulturae | Year: 2014

Clonal selection of promising palmyra palm for conservation and commercial cultivars was conducted between 2008 and 2009. The survey and clonal selection were done in main plantation of four regions in Thailand with 314 clones. The criteria for selected clones were large fruit, high weight, good color, good taste, high yield and high fresh juice. In the North region, 23 clones were selected, viz., PL 69, NS 19, PL 39, ST 28, NS 15, PL 55, NS 16, PL 53, NS 17, NS 21, KP 06, PL 27, KP 09, PL 56, PC 08, PL 21, KP 04, NS 01, NS 07, KP 12, PL 08, NS 13, and KP 02. In the North East region, three clones were selected, viz., NM 04, NM 17 and NM 18. In the East region, one clone of PJ 03 was selected. In the Central region, five clones were selected, viz., PB 01, PB 03, PB 05, PT 13 and CN 03. In the South region, three clones were selected that were SK 07, SK 09 and SK 05.


Poolperm N.,Office of Agricultural Research and | Thipmuangprom S.,Office of Agricultural Research and | Tayamanont P.,Horticultural Research Institute | Dangpium N.,Horticultural Research Institute | Kurubunjerdjit R.,Horticultural Research Institute
Acta Horticulturae | Year: 2014

A study on palmyra trunk and blossom management for fresh juice production was carried out at farmer fields in Phitsanulok and Nakhon Sawan provinces during 2008 and 2009. The experiment was tried in RCB, with 4 replications and 5 treatments. The treatments were pure water soaking, soaking in mud solution, encapsulation in mud, warm water soaking and non-soaking for a day. All treatments were applied after the trunk and blossom of the palm were properly squeezed or massaged with the wood for 2 to 3 days. Result showed that, all the treatments were significantly different. Palmyra trunk soaked with pure water gave the highest fresh juice as 126 L/trunk whereas encapsulation in the mud treatment showed as low as 18.8 L/trunk. Conversely, for palmyra blossom, encapsulating in mud gave highest fresh juice as 120 L/blossom while in the warm water soaking treatment they produced the lowest as 5.1 L/blossom.

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