Stevia cuttings breeding technology

First, select good breeds. The current planting varieties are mainly the "Shoutian" series and "Xinguang" series with high sugar content. Cutting time: There are two types of cuttings: autumn and spring. Early autumn seedlings from early September to the beginning of winter, the survival rate of premature seedlings is high; spring inserts from March 20 to the end of April. In general, large-scale autumn shoots are used.

Second, seedbeds. Seedbed selection: The sandy loam land with flat land, fertile soil and convenient drainage and irrigation is selected for the cutting bed. The seedbed size adopts a 1.25-1.3 m wide seedbed, and the ratio of seedbed to field is 1:30-40. Seedbed preparation: After preparing the seedbeds for digging, initial preparation is carried out. Each lore is smashed with 48% of Le Sibu granules (100-150 g) covering the mulch to kill underground pests and maintain surface moisture.

Third, cuttings. In finely-prepared seed beds, the distance between the two sides is fixed with a string, and the prepared seedlings are inserted with a knife cut. The seedlings are inserted into the soil between 2/3 and 1/2, and then compacted. The distance between the seedlings is Row spacing 3.5 cm, 1.2 cm spacing is appropriate, after insertion, use carbendazim to water pouring, and to drench, and then use 2 meters of bamboo to make arches inserted in the seedbed on both sides, set up a small scaffolding , Sunny day before 8 o'clock shade net (appropriately 2 meters wide shading nets is appropriate. Note: in the cut before the rooting agent with a rooting agent to soak the base, can improve the survival rate).

Fourth, seedbed management. One is to see seedlings fill water. In the first few days after planting, the cutting seedlings appeared wilting during the day and recovered at night. The humidity was suitable. If they cannot be restored at night, they need to be replenished with water. The water standard is 2.5-5 kg ​​per square meter. The second is spraying medicine and preventing disease. After the first drug application, the bactericide was used for spraying prevention every 2-3 days (500-fold solution of carbendazim suspension, 1500-fold solution of Deming-Hao, and hymexazol, etc.). If a diseased plant is found, remove it immediately and bring it out of bed to avoid spread. The third is shade light. Generally during the day when the maximum temperature is 15-28°C, the sunshade net can not be uncovered in the first 4 days after seedling emergence, and the illumination time is appropriately increased from the 5th day. When the temperature is higher, the temperature can be around 7:00 AM in the morning and the temperature can be lower. The shade net is affixed around 8 am, and the shade net will be removed after 5-6 pm. After that, the shading time will be shortened gradually. After 10 days, rooting will take place. No shading is required after rooting.

Fifth, winter management. When the surviving sweet seedlings pass through the winter, they must take antifreeze measures to control the temperature when the temperature drops to 15°C. In case of cold current, cover the grass curtain at night so as to avoid frostbite and dead seedlings. After the temperature rises, use good weather to timely weed out the water. Make up fat. Spring seedlings are protected against low temperatures, and film coverage is also required to increase the survival rate.

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