Improved rice varieties released in North Central Thailand
1988
Varamisra, V. | Chankasam, L. | Sirivong, K. | Suvanatane, S. | Sa-nguansaj, T. (Phitsanulok Rice Research Center, Phitsanulok (Thailand))
Two PSL breeding lines - Phitsanulok 60-1 (PSL 60-1) and Phitsanulok 60-2 (PSL 60-2) - were released in 1987. PSL 60-1, a high-yielding, photoperiod-sensitive variety is from a three-way cross among Khao Dawk Mali 105, Nahng Mon S-4, and IR26 (KDML 105/NM S-4//IR26). The cultivar is tall with long, slender, clear grain, low amylose content, and good cooking quality. During 1981-85, it averaged 3.48 t/ha, 12% higher than KDML 105, a standard variety. It is moderately resistant to bacterial blight, sheath rot, ragged stunt virus, brown planthopper, and gall midge. It was released for rainfed areas where water levels range from 50 to 75 cm. PSL 60-2, a high-yielding, photoperiod-insensitive variety is from a double cross (RDI/BR51-91-6//SPR6726-134-124/IR34). It is a semidwarf, medium-duration (130-140 d) variety with long, slender, clear grain, high amylose content, and good cooking quality. From 1983 to 1986, it averaged 4.73 t/ha, 17% higher than the RDI, a standard variety. It is resistant to sheath rot, and moderately resistant to blast, bacterial blight, and brown planthopper. It is recommended for irrigated areas.
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