Breeding and conservation of Dutch chrysanthemum
The Dutch chrysanthemums are Asteraceae, Asteraceae perennial flowers. The flower has more fibrous roots, underground stems, stems, many branches, height 60 cm to 100 cm, leaves linear lanceolate, smooth, slightly purple when young, forming umbels at the top of the branches, flowers Blue-purple, flowering in October. Dutch chrysanthemum is native to Europe and cultivated in all parts of northern China. Its cold tolerance is strong. It is mostly propagated by rooting and cutting. The root-division method is carried out after the sprouts have grown between April and May in spring. The roots will be dug up and divided by knives. Each piece should retain 3 to 5 buds, which are then planted, compacted, and watered. The cutting method is generally from May to June. The young shoots are cut from 5 cm to 6 cm in length. Cuttings from 3 to 4 knots are used for cutting. Sanding or sand is preferred for shading. Shading is appropriate and humidity is maintained. , rooting after about half a month, after the roots are born, they can be transplanted in the open field cultivation or the upper basin. Potted fertile cultivation of soil, the ramets or cuttings of small seedlings pot, pay attention to watering, timely fertilizer, and more use of human waste, bean cake water, horse manure and so on. Small seedlings use less fertilizer and can be topdressed once every 7 days to 10 days. After the autumn, the fertilizer is concentrated and the buds should be formed from 4 days to 5 days. The growth period should be trimmed as needed. After flowering, cut the upper part of the ground and place the pot in the cold room for the winter. For example, in the greenhouse, plants can be deducted from the pots, planted in a 30-cm deep pool, and squeezed together to cover the soil or cover the grass for the winter. Most of the transplanted crops in the open season were planted in the spring from April to May. They were planted in sunny, fertile and well-drained areas. When composting, compost or manure should be used as the base fertilizer, and planting should be done well and watered. Fertilize the roots around the roots after emergence or before flowering. Usually pay attention to watering when the drought. During the growing period, several pruning and shaping operations can be performed according to different cultivation purposes. After entering September, pruning should not be carried out to prevent the flower buds from being cut off and affecting flowering. It is prone to aphids and red spiders, which mainly damage the leaves and stems, causing yellow leaves and affecting growth. It can be used to prevent and treat 1,000 to 1500 times of dimethoate.