ⅱ Youxie 8 (Rice)

[basic situation] Ⅱ Youxie 8 is a new hybrid rice combination of high quality, high combining ability and disease resistance of wide compatibility restorer line Chenghui 448 and Ⅱ-32A, which was selected from the progeny of 871028 and Iemont. In recent years, through the experiment and demonstration of various regions (cities) in Sichuan Province, Ⅱ you 448 shows the characteristics of high quality, high yield, disease resistance, early maturity and wide adaptability.

[characteristics] the combination participated in the regional trial of medium indica maturity group in Sichuan Province from 1996 to 1997. The average unit yield in 2 years was 8.52t/hm2, which was 14.57% higher than that of the control. In the production test in 1997, the average yield per unit area was 8.08t/hm2, 8.73% higher than that of the control. In 1997, he participated in the three-cropping experiment of rice and vegetables in Guanghan City, yielding 8.97t/hm2 per unit area, which was 8.76% higher than that of Fuyou 63, and matured 3 days earlier. In 1998, II you 448 participated in the variety comparison test in Nanjiang County, the yield per unit area was 9.36t/hm2, which was 34.4% higher than that of the control Shanyou Wan3; in the seedling throwing test in Jingyang District, II you 448 produced per unit yield of 9.53t/hm2, which was 5.33% higher than that of the control Shanyou 63; and the rice regional test in Deyang City increased the yield by 4.34% and matured 6 days earlier than the control Shanyou 63. In 1998, II you 448 participated in the regional trial of late axis and middle-late maturity group in southern rice region, the yield per unit area was 6.57t/hm2, the yield level was similar to that of Shanyou 46 (Shanyou 10), and the growth period was similar.

The ratooning ability of this combination is strong and the yield of ratooning rice is high. According to the experiment at 1100m above sea level in Shuangjiang County, Yunnan Province in 1996, the yield of first crop rice was 7.95t/hm2, the yield of ratooning rice was 8.36t/hm2, and the yield of two crops was 16.31t/hm2.

According to the rice and product quality supervision, inspection and testing center of the Ministry of Agriculture (average in 1997 and 1998): II you 448 brown rice rate 79.1%, milled rice rate 72.5%, head rice rate 64.9%, rice length-width ratio 2.6,40% chalky grain rate, 6.2% chalkiness, transparency grade 2.5, alkali elimination value 6.0, gel consistency 41mm, amylose content 21.4%. In 1998, the total score of rice quality in southern rice regional test was 55, which was much higher than that of Shanyou 46 (49) and Weiyou 64 (46). The results showed that the appearance quality, processing quality, cooking quality and taste of II you 448 were significantly better than those of the main combination in production. Rice is shiny and palatable.

In 1997, the cooperation group identified II you 448 leaf blast, panicle blast, bacterial blight and heat tolerance in the Ninth five-year Plan. The results of resistance identification of late rice in southern rice region in 1998 showed that the resistance of II you 448 to rice blast, bacterial blight and brown rice planthopper was significantly better than that of Shanyou 46 and Weiyou 64, especially the incidence of neck blast was very low, which was grade 0. 1. According to the identification of Rice Sorghum Institute of Sichuan Academy of Agricultural Sciences: II you 448 leaf blast grade 4, panicle blast grade 1, incidence rate 1.2%, control Shanyou 195 leaf blast grade 9, panicle blast grade 9, incidence rate 64.6%. The frequency of resistance spectrum of Shanyou II you 448 is 83.6%, and the frequency of resistance to spectrum of Shanyou 63 is only 6.1%.

II you 448 was cultivated as medium rice in Sichuan, and the whole growth period was 144 days, which was generally 5-7 days shorter than that of Shanyou 63. The whole growth period of late rice cultivated in southern rice region was 123.6 days, which was 0.9 days longer than that of Shanyou 46. Cultivated in the middle mountain area (600-800m above sea level), the whole growth period is about 155 days, which is equivalent to that of Shanyou late 3.

II you 448 has vigorous growth in the early stage, middle and upper tillering ability, dark leaf color, good plant leaf type, narrow and erect leaves, plant height 100cm, good color transformation in the later stage, high panicle rate, effective panicle 2.82 million / hm2, seed setting rate 86%, 1000-grain weight 27g.

Crop Institute of Sichuan Academy of Agricultural Sciences

[region and technology] sow seeds at the right time and cultivate strong seedlings with many tillers. The medium rice was sown at the end of March and the beginning of April in northwest Sichuan and the middle of March in southeast Sichuan, while the late rice should be sown in mid-June. Raise seedlings in two stages, increase the application of phosphorus and potassium fertilizer, and cultivate short, sturdy and tillering seedlings. B) appropriate close planting. The plant type of II you 448 is compact, the flag leaf is straight and straight, it is suitable for close planting, and the planting specification is generally 20cm × 20cm. adequate manuring. Medium fertility field, general pure nitrogen per hectare 150~180kg, phosphate fertilizer 375~450kg, potash fertilizer 225~300kg. D) timely control of diseases and insect pests Timely control of Oviductus Ranae, rice bract, planthopper, bacterial leaf blight, sheath blight and rice blast according to the forecast of the local plant protection department to ensure a bumper harvest.

Chenghui 448 was sown in spring in Chengdu. The sowing period was 102 days, which was 7 days shorter than that of Minghui 63. The average number of leaves on the main stem was 15.5 leaves. The pollen quantity was sufficient, the pollen density was high, the pollen dispersal was good, the pollen vigor was strong, the florescence was 10-12 days, the flowering time was concentrated, and 11:3O~12:30 was in full bloom on sunny days.

The sowing time of Chenghui 448 and II-32A was shorter than that of II you 63. For other techniques, please refer to the seed production technology of II you 63.