Detailed Explanation of Key Cultivation Techniques for Q You No. 18 Rice

Breeding unit: This variety was bred by Chongqing Zhongyi Seed Industry Co., Ltd. and the Rice Research Institute of Chongqing Academy of Agricultural Sciences.

Characteristics: This combination is a medium-indica late-maturing three-line hybrid rice. When grown as medium rice, the whole growth period is 152 days, 3.2 days shorter than the control II You 838. Plant height is 110.4 cm. At a density of 12,000 hills per mu, the effective panicle number per mu is 143,000 panicles, the average number of grains per panicle is 159.6, the seed-setting rate is 82.0%, and the 1000-grain weight is 30.5 g. Plant height is moderate, plant type is compact, leaves are erect, leaf color is green, and tillering ability is relatively strong; the growth period is relatively short; it is a variety that balances panicle number and grain number.

Comprehensive evaluation of rice blast resistance is grade 5, and the resistance evaluation is medium susceptible.

Main rice quality indicators: brown rice rate 82.5%, head rice rate 71%, grain length 7.2 mm, length-to-width ratio 3.1, chalky grain rate 20%, chalkiness degree 3.8%, gel consistency 58 mm, amylose content 21.5%, reaching grade (3) of the national "High-Quality Rice" standard.

Yield performance: After two years of regional trials, 9 test locations showed increased yield and 6 showed decreased yield, with yield ranging from 456.7 to 680.0 kg; the average yield per mu was 541.8 kg, 3.1% higher than the control II You 838. In production trials, the average yield per mu was 534.6 kg, 0.73% higher than the control II You 838. The rate of locations with increased yield in regional and production trials was 65%.

Cultivation points: For this variety, sowing in early March is suitable in western Chongqing and the river valley areas along the Yangtze, and sowing in late March is suitable in deep hilly areas and the Wuling Mountain area; density: plant two germinated seeds per hill, 10,000-12,000 hills per mu; if planting one germinated seed per hill, it should be no less than 15,000 hills; pest and disease control. Seeds must be coated, and attention should be paid to the control of rice blast and sheath blight.

Suitable area: Suitable for planting as single-season medium rice in areas of Chongqing below 800 m elevation.