How to grow dragon fruit in greenhouse in the north
The best planting time in greenhouse is from April to May every year. The dragon fruit was planted with cement column according to the hole spacing of 2 × 3 meters, and one plant was planted in each of its four directions. It can also be planted along the east-west direction of the greenhouse according to the width of the shed. The dragon fruit likes high temperature and is afraid of low temperature, and the most suitable growth temperature is 25-35 ℃. For older branches, concentrated high-intensity sunlight exposure, if the time is too long, the accumulated temperature can not be dispersed, may cause burns in this part. Lack of water or lack of water branches grow slowly, the branches are small and not robust, and the flowering and fruiting will be delayed. Fertilizer should be mainly organic fertilizer, with a small amount of chemical fertilizer, chemical fertilizer can choose nitrogen, phosphorus, potassium ternary compound fertilizer, watering once a week (watering twice a week for some droughts), and applying 250g compound fertilizer once a month. In order to improve the fruit setting rate, artificial pollination should be carried out in greenhouse cultivation, whether it is white meat type or red meat type, and pollen can be dabbed on the stigma with fingers. The gibberellin of 100~200ppm can also be used to smear the base of the flower when the flower is fully open, and the fruit setting rate is higher. The length of fruit branch of dragon fruit is generally more than 1.5 meters and is in the reproductive growth period from April to November. The middle and upper branches and drooping branches are the easiest to bear fruit. Generally, there are 5 branches per plant, about 3 branches in each batch, and the other 2 branches are used as unfixed vegetative branches. At the end of the season, all the old branches that have borne fruit should be cut off. Dragon fruit is a kind of fruit tree that does not need to prevent diseases and pests, from flowering to fruit ripening, there is no need to spray any pesticides. Click to see more dragon fruit planting techniques
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What should be paid attention to in the propagation of dragon fruit seedlings
1. The cuttings are most suitable in spring and summer. The cuttings should select stem nodes with full growth, about 15 cm long, and insert into the sand bed after the wound is air-dried. The cuttings can take root in 30 days, and the roots grow to 3 cm and 4 cm in transplantable seedbed. Grafted seedlings choose the "measuring ruler" (a kind of wild) with no disease and insect pests, strong growth and full stem and flesh.
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