The big spike, large grain, and high-yield corn variety Zhongdan 808 was bred by Institute of Crop Science, Chinese Academy of Agricultural Sciences. Beijing Golden Nonghua Seed Industry Technology Co., Ltd. was responsible for the full development. In 2006, Beijing Golden Nonghua Seed Industry Technology Co., Ltd. Started large-scale industrialization. Passed the national examination and approval in 2006, the validation number is 2006037.
The variety has the following characteristics: it is a mid-late-maturing variety in the southwestern region and has a fertility period of about 113 days; the field performance is prosperous, the stems are thick, the leaves are dark green, the plant height is 2.61m, and the ear height is 1.19m; in 2005 the country In the southwest of the regional trial, the grain weight per panicle was 176.31 grams, ranking first; the grain weight was 329.4 grams, ranking second; yellow grains, dentions, long grain length, high seeding rate, red axis, long ear-type tuber; average ear 19.99cm in length, ranking first; about 16 rows per ear; identification by inoculation, resistance to stem rot, middle resistance to large, small leaf spot, sheath blight and corn borer, and silk smut; quality test, weight At 752 g/L, crude protein was 10.73%, crude fat was 4.33%, crude starch was 70.15%, and lysine was 0.29%. The quality was good and the bulk density was high.
In 2004, he participated in the Southwest Regional Experiment. Among the 24 pilots in 7 provinces and cities, the output ranked first in the test, with an average yield of 642.06 kilograms, an increase of 17.71% over the control Nongda 108 (average yield of 545.45 kilograms per mu), and the difference was extremely significant. . In 2005, the average yield per mu in the Southwest China test was 623.5 kg, which was 21.6% higher than that of the control Nongda 108, ranking the first place among the test varieties. The difference was extremely significant.
This variety is of medium-late-maturing type, with strong growth potential, high culm and large ear, good green holding, and strong disease resistance. The following high-yielding cultivation measures are especially recommended:
1. Choose a suitable area: It is advisable to plant sandy lands with sunny leewards and plots with high fertility and water conditions. Avoid planting at the bottom of river valleys, low-lying lands, and mountain beams. Spring planting areas with altitudes below 1,000 meters can be planted.
2. timely early sowing: timely early sowing can extend the growth period, increase production; at the same time can also stagger the impact of high temperature and drought in southwest over the years, to escape the pests and diseases. In the southwest, seedling transplanting is generally best from the end of February to the beginning of April (ground temperature is above 12°C); the live plots are sown well in late March and early April.
3. Cultivate strong seedlings: Before sowing, select uniform-sized seed and remove damaged, weak, diseased and diseased grains, and extra large grains. At the same time, drying seeds can increase the rate of emergence and guarantee the seedlings and seedlings. The use of square seedlings or fertilizer ball seedlings can be used mulching seedlings, centralized management, improve the quality of management to ensure that seedlings grow neat and consistent, can obtain Miaoquan, Miao Qi, Miao Zhuang. Note that the coating species can not be soaked, nutrition soil as far as possible without chemical fertilizers.
4. Reasonable density: This variety is a high light efficiency, big ear and large grain type. With appropriate density, it can give full play to the advantages of high productivity of large spikes and individual plants to obtain high yields. The average mu density is about 2,800 plants (single plant: 2.5 ft 0.88 ft, double plant: 3 ft 1.45 ft).
5. Grasp dwarfing cultivation: Appropriate application of corn plant growth regulators (such as: in the 8-10 leaves 1 heart with jade gold). Reasonable seedlings: seedlings have control to promote the next, before the control and promote, control the role of culm stalk. The use of cultivating grass roots, sloping soil, and cultivating roots of earthworms to spread the surface of the roots to create a dry and wet soil moisture gradient, promote root barbulation, control the growth of stems and leaves to achieve seedlings, strengthen roots, and control stem elongation Long to reduce the role of plant height. The seedlings are based on the seedling condition, and they are based on the principle of “black not black, yellow fat, no fat, no wetâ€.
6. Do a good job of artificial emasculation, assisted pollination and tipping techniques.
7. Fertilizer and Water Management: Insist on formula fertilization, reapply basic fertilizer, skillfully apply seedlings, stalk fertilizer, rush fertilizer, nitrogen, phosphorus and potassium. Seedling fertilizer should be used in combination with compound fertilizer and organic fertilizer. Phosphorus and potassium fertilizers should be re-applied at the seedling stage [45% of Xarcofu compound fertilizer (N:P:K=10:15:20), 45% of Western compound fertilizer (N: P:K=10:15:20)], with zinc, boron and other trace fertilizers; large bell-mouth replanting tapping manure (12 leaves around 1 heart), mainly nitrogenous fertilizer (urea). During the whole life of corn, the most drought-tolerant seedlings in the seedling stage are scarce; the water requirement for tasselling and flowering is the most, and the drought is the worst; according to the law of water demand, the irrigation and drainage is done in time.
8. Grasp the comprehensive prevention of diseases and pests: Conduct effective pest control and prevention according to the guidance of the local plant protection department. It is generally used to prevent and treat corn borer during the big bell mouth period, and to prevent and treat sheath blight after silking.
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