Green cauliflower, also known as broccoli, broccoli, is a variant of cabbage. With the continuous improvement of the living standards of urban and rural people, there are more and more demands for the diversification of vegetable varieties. The cultivation area has been expanding year by year, and it has now become one of the most important vegetables in people's lives. The green broccoli used in production is mostly a hybrid generation, and is made of an excellent self-incompatible line. Now introduce its hybrid seed production technology. First, sowing seedlings green sowing date is one of the key to the success of its seed production. Sowing too early will result in the early formation of flower bulbs, which will be susceptible to freezing damage. If sowing is too late, it will cause early flowering or make it flowering and podging. It will encounter high temperature and rain and will not be solid, affecting the yield and quality of seeds. It is necessary to select the appropriate sowing date based on species maturity and local climate conditions. Generally, seedlings are planted in a solar greenhouse or impotence, and the late-maturing varieties at the sowing date are early in January, and the early-maturing varieties are around the end of January. Seedling temperature 20-25 °C, the best nursery tray or nutritious oysters nursery, Yangshuo nursery seeding in about 30 days. When the seedlings grow to 2 leaves and 1 heart, pay attention to separate seedlings to cultivate strong seedlings. After the seedlings are tended, the seedbeds shall be irrigated with water once. Afterwards, the seedlings will grow and the air will be released. Second, planting in the middle and late March, the temperature can be planted after the recovery, planting should be cleared before the miscellaneous plant, apply enough base fertilizer, planting the field requires deep-leveling, irrigation convenience, not easy to water, the former is not cruciferous crops . The ridges were ridged and covered with a ridge distance of 1 meter. Parents were colonized in the same period at a ratio of 1:1, with a spacing of 40 cm. The requirements for seed production area within 1000 meters of green cauliflower or cabbage, broccoli, kale and other cruciferous plants seed production. Third, water and fertilizer management Green cauliflower needs a large amount of fertilizer in his life, in addition to planting 1000-2000 kg of organic fertilizer per acre before planting, but also need to topdressing more than 4 times. The first time after transplanting, the 20-kilogram urea or human fecal urine was recovered per mu; the second was in the vigorous growth stage, 20-kg urea was forcibly applied; the third was in the formation period of curd, 25 kg of compound fertilizer was applied. The 4th time in the flowering period, topdressing compound fertilizer 20 kg, urea 10 kg, potassium fertilizer 10 kg. In addition, at the end of the flowering period, foliar fertilizers such as boron fertilizer or potassium dihydrogen phosphate should be sprayed, sprayed once every 5-7 days, and sprayed 2-3 times in total in order to improve the seed setting rate and plumpness. Before scabs, pay attention to groundwatering to keep the ground moist. Watering should be controlled later in the scab to promote seed maturation. Fourth, pest and disease prevention and control Pests and diseases should be prevention-based, timely prevention and control, generally require centralized control before flowering, strict control of pests and diseases, try to avoid flowering spraying, such as flowering must be used, it should be carried out in the evening, so as not to harm bees and other pollination Insects are then treated again during the clams. The main diseases are black shank, black rot, downy mildew, etc. The main pests are cabbage caterpillars, aphids, and diamondback moths. General use of conventional insecticides can effectively control, the key to pay attention to medication time. Fifth, to miscellaneous and sparse flower buds When the flower bulbs are formed, it is necessary to remove the miscellaneous strains that are yellow-green or purple-green in color, loose in loose buds, or loose in loose bulbs. For a flower ball that has a uniform and consistent appearance on the trait, a part of the flower branch should be removed so that the flower branch can be fully elongated and the nutrients can be collected to ensure that the seed is full. The flowering branches are usually divided into three parts in sunny days. When the flower bulbs are fully inflated for the first time, the low-weak flower buds are cut with a knife, and the 8-10 stout flower buds are evenly distributed. The second time is the first one. When the squid that was selected for the second election began to grow long, the low-weaked branch was cut again; the third time was 5-7 days after the second twig, and when all the squid were extracted, the last one was selected. Four, but not more than 30 flowering branches. Note that when cutting squid, the cut surface should be inclined to prevent the wound water from rot. Sixth, artificially assisted pollination and prevention of lodging at the flowering period Use soft cloth or cotton thread to form a brush, alternately swiping two parental flowers or stocking bees to assist in pollination. During the period of podling, if necessary, a long squid should be strung together to prevent lodging and reduce production. VII. Harvest When the pods turn yellow, after the seeds are mature, they are harvested in batches to make the seeds as mature as possible without falling off the rips. The two parents should share the sun and mark it to prevent mechanical confusion. Li Yuhuan: Southern China Rural News
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