Cultivation Technique of Greenhouse Citron
First, raise seedlings. Because the torreya is not tolerant of frost, the 1- to 2-year-old seedlings of Toona sinensis have a weaker ability to resist low temperature, so it is necessary to produce the seedlings of Toona sinensis on time. Usually, from late October to early November, when the local seedlings begin to bloom, when the seedlings have fallen and the nutrients are mostly returned to the stems and buds, the seedlings must be grasped. Second, the use of ethephon. In order to prevent the abnormal weather, once the sudden cooling down is too late to raise the seedlings and freeze, spray 700-800 mg/kg ethephon in the middle and late October to accelerate the return of nutrients, speed up the defoliation, and advance into natural dormancy. When growing, try to keep the root system as much as possible, and keep the root length at least 20 cm. Third, low temperature processing. The production of Toona sinensis buds in greenhouses in winter must break the rules of long-term cultivation and development in open field, that is, break the natural dormancy of Toona sinensis seedlings, so that they sprout in advance. It is different from the production of citrons in large and medium sheds, and its seedlings must be treated at low temperatures. The deciduous tree seedlings show that they have entered natural dormancy. The natural dormancy period is 30 to 60 days. There is still a period of natural hibernation after the start of seedlings. If no cold treatment is performed before planting, after planting, there will be short shoots, small leaves, many fibers, weak aromas, bitter astringency, and poor quality. There are two kinds of low-temperature treatment methods: one method is to plant a false lee, that is, choose a leeward sunny place, dig 0.5 meters deep, 1 ~ 1.5 meters wide false sulcus, the finished seedlings obliquely placed in the ditch, tip toward South or east, roots are earthed and watered. If you suddenly cool down, you can use firewood or straw to cover the tip. Keep the natural temperature below 10°C for 20 days. Another method is to plant the seedlings directly out of the greenhouse to cover the film and grasshopper until the end of natural dormancy can be released, the indoor temperature is maintained at -5 °C ~ -6 °C, the maximum does not exceed 10 °C, making Not only free from freezing, but also able to successfully complete the natural dormancy. Fourth, soil fertigation. Before planting, apply 5000 kg of high-quality organic fertilizer and 100 kg of superphosphate into the ground, deep-cast 30 cm deep, mix soil manure, and plant fresh seedlings. Fifth, scientific colonization 1. Sunlight greenhouse camphor planting. In the local daily average temperature dropped to 3 °C ~ 5 °C, you can plant. Open a 30 cm deep ditch in the north-south direction. The ditch is 20 cm wide. Plant the seedlings at a spacing of 5-6 cm. When planting seedlings. The roots of seedlings should be kept stretched, but they can be overlapped. After they have been planted, remove the soil that has been dug out of the ground and use it to cultivate soil. Then irrigate the water and plant the second and third rows in turn. At the same time, as far as possible, the young seedlings were planted on the south side, and the big seedlings were planted on the north side to form a slash line that was low in the south and high in the north to facilitate growth and light reception. Usually every 1.5 meters wide to stay, convenient watering and other management. After all the plants were planted, they were allowed to continue their natural dormancy after more than 10 days under natural conditions. The seedlings are usually planted in the current year, with 100 to 150 plants per square meter; perennial seedlings, 80 to 120 plants per square meter. 2. Large and medium-sized sheds are planted in plastic. The use of plastic large and medium shed to produce sassafras, planted immediately after the seedlings out of the nursery, the method of planting the same with the solar greenhouse, just slightly higher in the middle, slightly lower on both sides. Planting water after colonization, covering ordinary film, closed and not ventilated. Spice Novelties Co.,Limited , https://www.wholesale-adult-toys.cn