D you 68 (Rice)

Breeding units: Rice Research Institute of Sichuan Agricultural University, Neijiang Hybrid Rice Center of Sichuan Province.

Approval: approved by Sichuan crop Variety approval Committee in 1997, National crop Variety approval Committee in 2000, Shaanxi crop Variety approval Committee and Henan crop Variety approval Committee.

Variety approval number: national examination and approval rice 20000002.

Variety source: D62A/ Duoshi No. 1.

Characteristics: medium indica late-maturing three-line hybrid rice. The plant height is 114.3 cm, the plant type is compact, the plant type is good, the ear length is 23.7cm, the effective ear per mu is 200000, each ear has 135.6 grains, the seed setting rate is 79.6%, and the 1000-grain weight is 26.7g. In the later stage, the color conversion is better, the yield is higher, and the yield stability is good. The head rice rate is 54.3%, the chalkiness is 10.5%, the amylose content is 20.2%, and the appearance rice quality is good. The whole growth period was about 147 days, which was 4.7 days later than that of Shanyou 63. The rice is moderately susceptible to rice blast, highly susceptible to bacterial blight and better in rice quality. In 1997, he participated in the national indica hybrid rice regional trial, with an average yield of 563.83 kg per mu, an increase of 0.85% over the control Shanyou 63. In 1998, he participated in the regional trial of the medium indica late maturity group in the southern rice region, with an average yield of 510.41 kg per mu, 0.9% higher than that of the control Shanyou 63, and an average yield of 568.81 kg per mu in the 1999 production test, 1.58% higher than the control Shanyou 63.

Key points of cultivation: sowing at the right time, sparse sowing to cultivate strong seedlings. The sowing rate per mu of seedling field should be controlled at about 10 kg, and the seedling age should be about 45 days. It is appropriate to plant 14000 holes per mu to ensure that the basic seedlings are more than 60, 000 per mu. Based on base fertilizer, supplemented by topdressing, and increased application of phosphorus and potash fertilizer. Do a good job in the adjustment of florescence. In seed production in Sichuan Province, the male parent Duoxi 1 usually sowed around April 1 and began to ear on July 25-28, while the female parent D62A sowed around May 1 and began to ear on July 25-28, and met well at flowering stage. The panicle type of D62A is larger and the outcrossing rate is high. When preparing Duoxi 1 with relatively concentrated heading, it is suitable to use the early male parent 1mi to start heading for 2 days. Do a good job in field management and do a good job in "September 20". D62A is lighter in neck and early in heading of main panicle. When "920" is applied, it should be concentrated, and the quantity should be relatively small. That is, the first fight was made when the female parent was heading 25%-35%, and then the second time the next day, and the total amount of "920" was controlled at 12 Mel 15 grams. The stigma exposure rate of D62A is high, so special attention should be paid to the control of rice powdery mildew during seed production.

Suitable scope: planting one-season middle rice in the southwest and the Yangtze River valley and the areas with light incidence of bacterial blight in Henan and Shaanxi provinces.