Ii Youxiang 13 (formerly known as Neixiangyou 13) (Rice)

Characteristics: this variety belongs to indica three-line hybrid rice. the average growth period of one-cropping middle rice in the upper reaches of the Yangtze River is 156.8 days, which is 3.6 days later than that of Shanyou 63. The stem, leaf rim and leaf node glume tip are all purplish red. The plant type is moderate, the cold tolerance is medium, the grain weight per ear is more coordinated, and the color change is good at ripening stage. The number of effective ears per mu is 160000 ears, plant height is 116.4 cm, ear length is 25.6cm, total grains per ear is 161.6, seed setting rate is 81.8%, and 1000-grain weight is 27.9g. Resistance: Rice blast 9, bacterial blight 7, brown planthopper 7. Main indicators of rice quality: head rice rate 66.5%, aspect ratio 2.3, chalkiness rate 24%, chalkiness 3.3%, gel consistency 60 mm, amylose content 21.9%.

Yield performance: in the regional trial of medium indica late maturity and high yield group in the upper reaches of the Yangtze River in 2002, the average yield per mu was 552.68 kg, which was 1.17% higher than that of Shanyou 63 (not significant). In 2003, the average yield per mu was 571.15 kg, which was 0.45% lower than that of Shanyou 63 (not significant). In the two-year regional trial, the average yield per mu was 562.49 kg, which was 0.29% higher than that of Shanyou 63. In the production test in 2003, the average yield per mu was 598.35 kg, which was 0.94% higher than that of Shanyou 63.

Key points of cultivation techniques: 1. Cultivate strong seedlings: according to local planting habits and sowing at the same time with Shanyou 63, it is better to plant middle seedlings because of the large elasticity of seedling age; 2. Transplanting: the planting method is wide and narrow, planting 13-15 thousand holes per mu. The basic seedling is guaranteed to be about 100000; 3, fertilization: re-application of bottom fertilizer, early topdressing, avoid partial application of nitrogen fertilizer. The amount of superphosphate in super-high-yield cultivation is not less than 25 kg per mu and potash fertilizer is not less than 15 kg per mu. 4. Water slurry management: special attention should be paid to the management of water slurry in the later stage, and the quality and yield should not be affected prematurely by dehydration. 4. Pest control: special attention should be paid to the control of rice blast and bacterial blight.

Approval opinion: after examination, the variety conforms to the national rice variety approval standard and has been approved. The variety has the advantages of late maturity, medium yield, high susceptibility to rice blast, susceptibility to bacterial blight and good rice quality. It is suitable to be planted as one-cropping middle rice in the middle and low altitude rice areas of Yunnan, Guizhou and Chongqing (except Wuling Mountain area), Pingba rice area of Sichuan and light incidence areas of rice blast and bacterial blight in southern Shaanxi.