Causes of blind branches and blind flowers of tulips

Tulip belongs to Liliaceae, Tulip belongs to perennial bulb herb. It has tall and straight plants, large and gorgeous flowers, and high ornamental value. However, if the nursing is not proper, tulips are prone to blind branches and blind flowers.

The symptoms of blind flowers are that the branches and leaves develop normally, the weak ones lose water, the flower buds are white, the leaves are pointed, and the flower stems are atrophied; in the strong ones, the flower stems are short, the petals remain green or white, and curl with stamens and pistils, which can not open completely. Blind branches, that is, the aboveground parts of the plant only have a hypertrophic leaf, no leafy branches, and no flowering branches. The reasons for its formation are as follows:

First, it is related to variety, biological characteristics and cold treatment time: due to the long-term training of harsh natural conditions in the place of origin, tulips not only form the characteristics of cold-resistant and heat-resistant varieties, but also make them have to undergo a certain period of low temperature treatment. the biological characteristics that stems and leaves can blossom only after they have been fully grown. In northern China, open field planting in autumn and winter can meet the requirement of low temperature, and it will blossom from April to May in the second year. Using this characteristic, tulip bulbs can be treated with low temperature of 9 ℃ or 5 ℃, which can promote cultivation and provide flowers all the year round. The blind flower phenomenon in production is mainly due to the fact that the seed bulb does not meet the requirements of flowering without low temperature vernalization or short cold treatment time.

Mainly because most of the flower buds of the bulbs of this size are not yet fully developed, the treatment time of the bulbs with a diameter of 12 cm at the intermediate temperature of 17 ℃-20 ℃ must be prolonged by 1 week before cold treatment. If the bulb size is different, the middle temperature is not handled properly, and the cultivation is promoted, the lack of fertilizer supply during vegetative growth is easy to lead to blind branches and blind flowers. Therefore, producers are reminded that bulb specifications should be strictly selected according to different cultivation methods in mass production.

Third, the influence of human factors: first of all, when removing the bulb before planting, we should try not to lose the stem buds and reduce the occurrence of blind branches. Secondly, extreme high temperature is artificially caused during storage and transportation, such as excessive heat dissipation from the bulb itself or other fruits, vegetables, flowers and engines, resulting in the production of ethylene in the bulb. When the concentration of ethylene reaches 0.1dpm, the buds will die, and a large number of blind branches will appear after cultivation.

Fourth, the influence of other factors: for example, incorrect watering in cultivation, excessive humidity in greenhouse, root asphyxiation caused by seed ball disease, there is no yield to speak of.