ⅱ you 448 (Rice)

The main results are as follows: (1) Variety source: this variety is a new medium indica hybrid rice combination of II-32A and Chenghui 448, which is used by crop Institute of Sichuan Academy of Agricultural Sciences.

(2) characteristics: the whole growth period was 145days, which was 7 days longer than that of Shanyou 195. the plant height was 100.5 cm, the ear length was 25 cm, the grain per panicle was 142g, the 1000-grain weight was 26.88g, and the Lemma tip was purple. The plant has strong stem, good lodging resistance, vigorous growth at seedling stage, strong tillering ability, more effective ears, light green leaf color, moderate leaf type, erect flag leaves, cold tolerance in seedling stage, good heat resistance in later stage, neat panicle layer and good color conversion in later stage. The comprehensive quality of rice was better than that of Shanyou 195. Strong resistance to rice blast.

(3) yield performance: the average yield per mu in the provincial trial from 1996 to 1997 was 567.72 kg, which was 14.57% higher than that of Shanyou 195. In the production test, the average yield per mu was 586.0 kg, with an increase of 8.73%.

(4) cultivation techniques: ① sowing time: the end of March and the beginning of April in Northwest Sichuan and the middle of March in Southeast Sichuan. ② two-stage seedling raising or plastic film heat preservation raising seedlings to cultivate strong and tillering seedlings with a seedling age of 40-45 days. The planting density of ③ is 1.5-18000 holes per mu, about 100000 basic seedlings per mu and 180000 effective panicles per mu. ④ fertilization: medium fertility fields, 10-12 kg of pure nitrogen, 25-30 kg of phosphate fertilizer and 15-20 kg of potash fertilizer per mu.

(5) suitable planting areas: it can be planted in the areas of medium-maturing combinations such as Shanyou 195, Fuyou 838 and Ai you S.