Sorghum is one of the important foods in China. It has been planted since the early days. The strength of the seedlings directly affects the yield and economic benefits of sorghum. So, what are the breeding techniques of sorghum?
1. Choose high-quality sorghum. For low-altitude areas, it is better to use a plant with a shorter plant, a higher yield in the first season, and a strong regenerative capacity. It is also possible to use conventional sorghum varieties such as red sakura and green shell, which are strong in stress resistance and do not retain regenerative sorghum. Each acre of field requires 250 grams of conventional sorghum seeds and 500 grams of hybrid sorghum varieties.
2. Sorghum chooses nursery land. It is necessary to select a mature area where the soil layer is deep, fertile, the seedbed is flat, the leeward is sunny, and the drainage is good.
3, sorghum sowing at the appropriate time. The sorghum sowing period should consider factors: First, the temperature during the sowing period. The soil temperature is stable above 10 Â°C. The higher the temperature, the better the normal emergence of sorghum, and the effective accumulated temperature of more than 10 Â°C between seeding and emergence reaches 70 Â°C or above, so as to ensure safe emergence of sorghum. In low-altitude areas of Chongqing, suitable sowing temperatures can be reached in the middle and middle of March. The second is the convergence of the mouth. The research results of the research institutes show that the sorghum variety No. 8 is suitable for transplanting at 6 leaf ages and within 30 days of seedling age. Therefore, the sowing period of sorghum in Chongqing is: low-altitude areas, no sputum contradictions can be planted in March and mid-term; higher altitude, with wheat and other small spring crops, should be planted in late March to early April .
4, sorghum seed treatment. Seeding for 2 to 3 days before sowing, the selected seeds can be soaked in 0.1% potassium dihydrogen phosphate solution or 3% Guangshen Ning water for 12 to 14 hours, during which water is changed 1 or 2 times, after the seeds are inflated. Pick up the filter and germination to the powder mouth.
5, heat preservation seedlings. The breeding methods of sorghum are mulch film raising seedlings, floppy seedlings and conventional film mulching. Production is generally carried out by two methods of conventional filming and floppy seedlings.
Conventional mulch seedlings are usually covered with double membranes, with a height of more than 26 square meters per mu of seedling beds, 6 feet of open ditches, deep excavation, 50 kilograms of calcium phosphate, 1500 to 2000 kilograms of decomposed water, less fine, After leveling the seedbed, the bins are evenly distributed back and forth, divided into 2 to 3 times, and covered with fine soil 1 cm. After applying the manure water, cover the mulch and cover the mulch with bamboo.
The mulch mulch seedlings are covered by a single membrane, and the seedling bed for transplanting the field is 13.3 square meters. The 461-hole cultivating tray 22 or 561-hole cultivating trays are used, and the width of the two slabs is used to make the seedbed. After pouring, the water is poured into the mud, and the plate is pressed into the mud; the nutrient soil prepared by the high-quality vegetable garden fine soil or the dryland sturdy agent is filled into each hole to 2/3 position, and then one sorghum seed is broadcasted per hole, and is used after being broadcasted. The fine sand cover is flat to the hole surface, and then the spray hole is used to spray the wet hole and finally covered with the ground film.
6, sorghum seedbed management. One leaf and one heart uncover the film refining seedling; two leaves and one heart even seedling weeding, killing the insects with the enemy, splashing water and drought resistance; when the three to four leaves are used, the urea is mixed with 5 kg of urea into the clear water and the seedlings are planted to cultivate the seedlings.
7. Transplant at the appropriate time. Gao Yiyi should choose sunny and good weather transplanting within 6 leaves to avoid transplanting in rainy weather, prevent sudden excessive moisture after transplanting, waterlogging roots and forming dead seedlings.
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