Zhongdan 909 variety name? Zhongdan 909 variety approval number? Black Shenyu 2012005 Original code? Pilot 839 Breeding? Introduction unit? Institute of Crop Science, Chinese Academy of Agricultural Sciences Variety source? Zheng The 58 female parent is bred by the HD568 male parent hybrid method. Characteristics? Common corn varieties? The first leaf sheath in the seedling stage is purple? The leaves are green? The stem is green? The plant height is 258 cm, the ear height is 106 cm? The ear is long and cylindrical? The cob is white? The number of leaves in the adult plant is 21? The ear length is 19.3 cm, ear diameter 5.0 cm, number of rows per ear: 14 to 16 rows, seeds semi-dentate shape, yellow, 100-grain weight 33 grams. Quality analysis results: Crude starch 69.38? 75.41? Bulk weight 770? 804 g/L? Crude protein 8.91? 11.27? Crude fat 3.77? 3.90. Inoculation identification results? Large leaf spot? Level 3? Head smut? 9.1? 20.4. . The number of days from seedling emergence to mature growth in the adaptation zone is about 130 days. It requires ≥10℃ active accumulated temperature of about 2700℃. Yield performance: In 2009 and 2010, the average yield per hectare in regional trials was 9012.6 kilograms, an average increase of 8.0 compared to the control. In 2011, the average yield per hectare in the production test was 10148.0 kilograms, an increase of 5.6 compared to the control variety Zhengdan 958. Key points of cultivation technology: This variety should be sown in early May in the adapted area. Select land with moderate or above fertility for planting. Use clear seed cultivation method on the ridge. The number of seedlings per hectare should be between 60,000 and 67,500. Fertilization method and amount of fertilizer per hectare? Base and seed fertilizer are applied deeply at one time during ridging or sowing. Apply 225 kilograms of diammonium phosphate, 75 kilograms of urea, 75 kilograms of potassium sulfate, and 15 kilograms of zinc sulfate per hectare. Apply 300 kg/ha of urea during the jointing stage and 2 cubic meters of farmyard manure per mu if possible. Combine base, seed and top dressing. Field management and harvest? Timely field management? Deep loosening before shoveling? Do two shovels and three passes? Seedlings at the 3-4 leaf stage? Determine the seedlings at the 5-6 leaf stage? Leave a single plant in each pot? Ensure that the seedlings are complete, even and uniform. If the seedlings are healthy and strong, pay attention to insect control and harvest at the right time. Notes? Adaptation area? The upper limit of the first accumulated temperature zone in Heilongjiang Province. Approval certificate number? National Examination Jade 2011011 Variety name? Zhongdan 909 Breeding unit? Institute of Crop Science, Chinese Academy of Agricultural Sciences Variety source? Zheng 58 as the female parent? It is a hybrid combination of HD586 as the male parent. Characteristics: 101 days from emergence to maturity in the Huang-Huai-Hai region, 1 day later than Zhengdan 958. The leaf sheaths of seedlings are purple, the leaves are green, the leaf margins are green, the anthers are light purple, and the glume is light purple. The plant type is compact. The plant height is 260 cm. The ear height is 108 cm. The number of leaves on the adult plant is 21. The filaments are light purple, the fruit is tube-shaped, the ear is 17.9 cm long, the number of rows is 14 or 16, the cob is white, the seeds are yellow, half-dent shape, and the 100-grain weight is 33.9 grams. After two years of inoculation evaluation by the Plant Protection Institute of the Hebei Academy of Agriculture and Forestry Sciences, it was moderately resistant to Curvularia leaf spot, susceptible to large spot, small spot, stem rot and corn borer, and highly susceptible to smut. As measured by the Grain Quality Supervision, Inspection and Testing Center of the Ministry of Agriculture in Beijing, the grain bulk density is 794 grams/liter, the crude protein content is 10.32, the crude fat content is 3.46, the crude starch content is 74.02, and the lysine content is 0.29. Yield performance: In 2009 and 2010, we participated in the Huanghuaihai summer corn variety regional trials. The two-year average yield per mu was 630.5 kg, an increase of 5.1% compared with the control. In the 2010 production test, the average yield per mu was 581.9 kilograms, an increase of 4.7% compared to the control Zhengdan 958. Key points of cultivation techniques? 1. Plant in plots with medium fertility or above. 2. The suitable sowing period is early to mid-June. 3. The suitable density is 4,500 to 5,000 plants per acre. 4. Pay attention to preventing and controlling pests and diseases and harvest in time. Approval opinion? This variety complies with the national corn variety approval standards? It has passed the approval. Suitable for summer planting in Henan, Baoding, Hebei and the south, Shandong except Binzhou, Shaanxi Guanzhong Irrigation District, Shanxi Yuncheng, northern Jiangsu, northern Anhui, except Huaibei City. Use with caution in areas with high incidence of black powdery mildew