Jimai 20 (formerly known as 955159)

Approval number: national examination Mai 2004011

Breeding unit: crop Research Institute of Shandong Academy of Agricultural Sciences

Source of variety: Lumai 14ram 884187

Provincial examination and approval: examination and approval by Shandong crop Variety approval Committee

Characteristics: semi-winter, mid-late ripening, maturity one day later than the control Shi 4185. The seedling is semi-creeping, the tillering ability is strong, and the auricle is purple. The plant height is 73 cm, the plant type is compact and the ear layer is neat. Spindles, long awn, white shell, white grain, hard. The average number of ears per mu is 434000 ears, the number of grains per ear is 32.3, and the weight of 1000 grains is 40.5g. Resistant to lodging, good cold resistance, and moderate resistance to dry and hot air in the later stage. Cold resistance identification in 2001-2002. frost injury grade 3, overwintering rate 100%, frost injury grade 3, overwintering stem 99.6%. Identification of inoculation resistance: immune or highly susceptible to leaf rust (resistance separation), moderately susceptible to stripe rust and sheath blight, highly susceptible to powdery mildew. In 2002 / 2003, the mixed samples were determined: bulk weight 804max 789g / L, protein content 14.9pm 14.3%, wet gluten content 34.5%, sedimentation value 38.1pm 54.2ml, water absorption 61.4pm 56.4%, dough stability time 7.2pm 28.6min, maximum extension resistance 325/565E.U, tensile area 77126 square cm.

Yield performance: the average yield per mu was 463.3 kg, which was 0.3% lower than that of Shi 4185 (not significant) in 2001-2002. in 2002-2003, the average yield per mu was 464.7 kg, 0.2% lower than that of Shi 4185 (not significant). He participated in the production experiment in 2003-2004. the average yield per mu was 443.5 kg, which was 1.1% lower than that of the control Shi 4185.

Key points of cultivation techniques: the suitable sowing date is the first ten days of October. Pay attention to the control of stripe rust, sheath blight and powdery mildew in the middle and later stages.

Approval opinion: after examination, the variety conforms to the national variety approval standard and has passed the examination and approval. It is suitable to be planted in the high school water-producing and fertilizer-producing land in the north of Huang-Huai winter wheat region in the central and southern part of Hebei Province, Shandong Province and the north of Henan Province.