Cultivation techniques of toon in greenhouse

1 Buckle the shed in time

Generally, there is a period of physiological dormancy after deciduous leaves. If the planting is early, the shed will be buckled late, otherwise the buds will not easily germinate and grow poorly. If it is planted after the end of November, the shed will be buckled immediately after planting. At this time, the dormancy of Thunb buds has been lifted, and the temperature should be increased immediately to promote germination.

2 Temperature and humidity adjustment

After the toon seedlings are moved into the greenhouse, they may not be heated for a few days, keeping the temperature at 15 ℃, in order to slow down the seedlings. After 8 to 10 days, heating begins, so that the temperature in the shed is controlled at 18 to 24°C during the day, 12 to 14°C at night, and the ground temperature is maintained above 15°C. At the same time, high soil humidity should be maintained. After planting, water should be poured to keep the relative humidity of the air at about 85%. If the humidity is too low, the buds will easily shrink and grow slowly. If the humidity is too high, it is easy to lower the temperature of the shed and the germination of the buds is slow. If the humidity is insufficient, spray water on the branches at noon on a sunny day. When the humidity is too high, it should be ventilated and dehumidified at noon on a sunny day.

3 Hormone treatment

After planting the delayed seedlings, apply 4 to 5 dormant buds on the upper part of the toon seedlings with the extract of Zhizhibao, generally 100 to 120 buds per 1g of the agent, and germinate and extract the buds 7 to 9d after the application. %.

4 Pick buds and stubble in time

At a suitable temperature, the top buds can germinate after being buckled for 40 to 50 days. When the buds grow to 15 to 20 cm and the coloring is good, harvesting will affect the yield early, and the buds will be aged after harvesting, and the quality will be reduced. The top buds can be harvested as a whole, and the side buds can be left with 1 to 2 leaves at the base as supplementary leaves. The harvest should be carried out in the morning and evening. Generally, it is harvested every 7 to 10 days, and 4 to 5 times in total. Foliar spraying should be carried out 2 to 3 days before the harvest of each stubble, and the top dressing and watering should be carried out more than ten days after the buds are harvested, with 300kg/hm2 of ammonium nitrate each time. Generally, the toona seedlings in the greenhouse should be stubble by mid-April, that is, cut the seedlings from 10 to 15cm above the ground, and the stubble height of the seedlings is 10cm, and the stubble height of seedlings above 2a is about 15cm, and then transplanted in the open for cultivation The plant spacing is 30cm to 40cm, and the density is about 90 thousand plants/hm2. After transplanting, water well, plowing in time, and after the buds germinate, select one strong bud and cultivate into the next year's seedlings.

5 Pest control

Toon has fewer pests and diseases, and no spraying is needed during the bud harvesting period. The seedling stage is prone to stand blight, cataplexy disease, root rot, etc., can be sprayed with 600% solution of 25% carbendazim wettable powder in time, or irrigated with 500%-700 times solution of 1% double-effect Ling, every time Root irrigation once every 7 days, continuous irrigation 2-3 times. Insect pests of toon include toon caterpillars, beetles, spiny moths, etc., which can be controlled with 800% solution of 90% trichlorfon crystals or 150 times solution of 40% dimethoate emulsifiable concentrate. If the tea yellow mite is found to be harmful before planting, it should be sprayed with 1500-2000 times of 15% damectin EC for prevention and control.

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