Evaluation of Introduced Hybrid Rice Combinations and Some Vietnam Hybrids

News source: Department of Agriculture and Forestry Extension, MARD, Vietnam
For further information, see Science & Technology Journal of Agriculture and Rural Development, No.3, 2003, pp.257 -259., 2003-10-01

Good Grain Quality and Resistance to Blight

This study identified new hybrids with better grain quality and resistance to bacterial leaf blight (BLB) (Pseudomonas campestris pv. oryzae) than Shan You 63 and Shan You Gui 99. These two hybrid combinations were introduced from China and successfully grown in large scale in the northern part of the country. Seventy (70) entries from the International Hybrid Rice Observation Nursery (1995), 17 hybrid combinations from IRRI, and 4 others from China were tested in field trials at the experimental stations in An Khanh, Ha Tay province (spring 1996) and Thanh Tri, Hanoi (summer 1996).

Promising Hybrid Combinations

Following are the promising hybrid combinations from the field trials:

• Hybrid IR 6408A/827 having growth duration of 110 days gave the highest yield of 6.08 MT/ha in the summer cropping season of 1996, compared to 4.38 MT/ha of CR203 (check), 5.1 MT/ha of Shan You 63, and 4.95 MT/ha of Shan You Gui 99. Hybrid IR 6408A/827 also showed resistance to BLB.
• HRSP 783 and HRSP 789 ranked second in terms of yield, 5.78 MT/ha and 5.81 MT/ha, respectively. However, HRSP 783 showed susceptibility to BLB.
• Three hybrid combinations, 25A/19304, 25A/49461 and 25A/72, from the International Hybrid Rice Observation Nursery, as well as three hybrids 97A/58, 97A/29723, and 97A/25587 also showed good performance, such as short duration, tolerance to BLB in the field, and good grain quality. Their yields were similar to those of the Chinese hybrids.
• The two-line hybrid S3 was identified as having short duration, high yielding potential, good grain quality, and tolerance to BLB in the field.
• Bo You 64 and Bo You Gui are two well-known introduced hybrids in Vietnam. They are uniform and have high yielding potential (5.3- 5.6 MT/ha).

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