Detailed introduction to the rice variety II You 128

Breeding institution: Rice Research Institute, Guangdong Academy of Agricultural Sciences.

Approval status: approved by the Guangdong Provincial Crop Variety Approval Committee in 1998, and in 1999

by the National Crop Variety Approval Committee.

Variety approval number: Guoshen Dao 990008.

Variety source: II-32A x Huhui 128.

Characteristics: a late-maturing thermo-sensitive hybrid rice combination. Plant height 100-105 cm, compact plant type, thick and sturdy stems. Effective panicles per mu 163,000, 140-150 grains per panicle, seed setting rate about 85%, 1000-grain weight 25-26 g. Brown rice rate 80.9%, milled rice rate 74.4%, head rice rate 67.8%, chalkiness rate 40%, chalkiness degree 5%, transparency grade 2, gel consistency 32 mm, amylose content 24.0%. As early-season rice, the whole growth period is about 137 days; as late-season rice, the whole growth period is about 120 days. High and stable yield, medium rice quality. Tolerant to fertilizer and resistant to lodging, relatively strong cold tolerance at the late stage, moderately susceptible to rice blast, not resistant to rice planthopper. In 1997, it participated in the national South China late-season rice group regional trial, with an average yield of 360.25 kg per mu, increasing yield by 11.9% and 15.3% respectively compared with the controls Jingxian 89 and Boyou Gui 99; in 1998, in the continued trial, the average yield was 488.13 kg per mu, increasing yield by 15.3% and 10.2% respectively compared with the controls Jingxian 89 and Boyou Gui 99. In 1998, it participated in the national South China late indica group production test, with an average yield of 511.37 kg per mu, increasing yield by 19.9% and 9.2% respectively compared with the controls Jingxian 89 and Boyou Gui 99, ranking first.

Cultivation points: sowing rate 10-12.5 kg per mu. As early rice, seedling age about 30 days; as late rice, seedling age 18-20 days. Generally 20,000 hills per mu, basic seedlings about 40,000; for seedling-throwing cultivation, no fewer than 18,000 plants per mu, with 40,000-50,000 basic seedlings. Apply sufficient basal fertilizer, apply tillering fertilizer early and heavily, and apply panicle fertilizer later according to seedling condition. Shallow-water transplanting, one-cun water for seedling establishment, thin water for tillering, and sun-drying the field when enough tillers are reached. Control rice thrips at the seedling stage, and control locusts, rice leaf roller and planthopper during the tillering and panicle-forming stage. In Guangdong Province for late-season seed production, the sowing interval between parents is arranged as 12 plus or minus 2 days; the leaf age difference is 4.1 leaves; in Sanya City, Hainan Province, for autumn-winter seed production, the sowing interval between parents is arranged as 14 plus or minus 2 days. The row ratio of parents is 1:12 or 1:14. The amount of "920" used is 15-18 g.

Suitable range: Guangdong, central and southern Guangxi, Hainan Province, and southern Fujian Province for early and late season planting.