Non - glutinous Rice Variety Phitsanulok 80

Abstract

Popular varieties sown under the rainfed condition in the Lower North Thailand consist of both local and released varieties. These varieties have low yield potential. Hence, Phitsanulok Rice Research Center have concentrated the research on improvement of rainfed rice varieties in order to serve the farmers' need. This resulted in a variety called Phitsanulok 80 obtaining from the three-way cross of SPR90/IR56//RD27 since 1991. The population were sown and selection was carried out continuously from F1-F5 resulted in the promising line, PSL92147-1-2-4. As for any released variety, this line was gone through various steps from observation followed by yield trials in intra-station, inter-station, farmers' fields and yield stability. It was also tested for reaction to significant disease and insect pests, physical and chemical qualities, seed dormancy and reaction to N fertilizer. It was found that the line provided an average yield of 642 kg/rai (4.01 t/ha) with a good yield stability. It is a non-glutinous, photoperiod sensitive, medium maturity variety ideal to be harvested in early December. This variety has a strong culm having erected flag leaf, long neck and compact panicle. The height is 141 cm on average. It has low chalkiness. The brown rice has a slender shape with 7.45 mm long. It has an excellent milling quality, low amylose content, low gel consistency and gel temperature, therefore resulted in a soft cooked rice. Phitsanulok 80 obtains characters from its parents i.e. high yielding ability from Suphanburi 90 and good crop canopy from IR56. It has a few disadvantages i.e. susceptible to brown planthopper, moderately susceptible to rice blast and bacterial blight.