First, start the seedlings. Because the citron is not resistant to frost, the 1-2 year old fragrant seedlings have a weaker ability to withstand low temperatures, so it is necessary to release the fragrant seedlings on time. Generally, from late October to early November, before the arrival of the local first frost, when the seedlings have fallen and most of the nutrients return to the stems and buds, it is necessary to grasp the seedlings.
Second, the use of ethephon. In order to prevent the weather from being abnormal, once it is suddenly cooled, it is not possible to freeze the seedlings. It can spray 700-800 mg/kg ethephon in the middle and late October to accelerate the return of nutrients, speed up the leaves, and enter the natural dormancy early. When rooting, try to leave more roots and keep the root length more than 20 cm.
Third, low temperature treatment. In the winter greenhouse, the production of camphor buds must break the long-term cultivation and development of the open field, that is, break the natural dormancy of the camphor seedlings and make them grow longer in advance. It is different from the production of large and medium-sized camphor, and its seedlings should be treated at a low temperature. The leaves of the camphor seedlings indicate that they have entered natural dormancy. The natural dormancy period is 30 to 60 days, and there is still a period of natural dormancy after the seedling is not completed. If the low temperature treatment is not carried out before planting, the sprouting head will be short, the leaves are small, the fiber is rich, the aroma is not strong, and there is bitter taste and poor quality. There are two kinds of low-temperature treatment methods: one method is pseudo-planting, that is, picking a leeward sunny place, digging a false planting groove of 0.5 m deep and 1 to 1.5 m wide, and slanting the seedling head in the ditch, the tip is facing South or east, the roots are soiled and watered. If the temperature is suddenly lowered, the tip can be covered with firewood or straw. Maintain a natural low temperature of 10 ° C or less for 20 days. Another method is to plant the seedlings directly into the solar greenhouse, cover the film and grasshoppers, until the end of natural dormancy can be revealed, the indoor temperature is maintained at -5 ° C ~ -6 ° C, the maximum does not exceed 10 ° C, so that It is neither frozen nor can it successfully complete natural dormancy.
Fourth, land preparation and fertilization. Before planting, apply 5,000 kg of fully decomposed high-quality organic fertilizer and 100 kg of super-calcium phosphate per acre, spread it on the ground, deepen 30 cm, mix the soil dung, smash it, and prepare to plant the seedlings.
V. Scientific colonization
1. The greenhouse is planted in the greenhouse. When the local average daily temperature drops to 3 ° C ~ 5 ° C, you can colonize. A 30 cm deep trench is opened along the north-south direction, the trench is 20 cm wide, and the seedlings are planted at a planting distance of 5-6 cm. When planting seedlings. The roots of the seedlings should be kept stretched, but they can be overlapped. After the row is finished, the soil excavated by the ditch is taken to cultivate the soil, and then the water is poured, and the second row and the third row are planted in sequence. At the same time, the seedlings should be planted on the south side as much as possible, and the large seedlings should be planted on the north side to form a diagonal line with a low south and a high north to facilitate growth and light. It is usually left at a width of 1.5 meters to facilitate watering and other management. After all the plants were finished, after more than 10 days under natural conditions, they continued to complete the natural dormancy, and then buckled the shed. Generally, the seedlings are planted in the same year, planting 100-150 plants per square meter; perennial seedlings, planting 80-120 plants per square meter.
2, plastic large, medium shed camphor planted. The use of plastic large and medium sheds to produce camphor, planted immediately after the emergence of seedlings, the colonization method is the same as the solar greenhouse, but the middle is slightly higher, the sides are slightly lower. After planting, the water is planted with water, covering the ordinary film, and it is sealed and not ventilated.
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