Improper maintenance. For example, too much water in seedling stage, too much nitrogen and lack of phosphorus and potassium fertilizer, untimely pruning, too early or too late coring, cutting techniques, etc.
The suitable substrate of chrysanthemum is slightly acid sandy loam with good drainage, looseness and fertility.
Generally, the river sand with good water permeability and air permeability is selected and mixed with garden soil and humus soil. The proportion is humus soil: garden soil: river sand = 4:4:2.
If conditions permit, it is better to use formalin or Carbendazim and other disinfectants to spray the culture soil according to the concentration in the instruction manual for disinfection.
Chrysanthemum is a short day plant, which is conducive to vegetative growth under long day conditions, and to reproductive growth under short day conditions, that is, short day is easy to bloom.
Generally, the flower bud begins to differentiate within 14.5 hours after the chrysanthemum plant grows to normal 10 leaves. After flower bud differentiation, it takes 13.5 hours.
The requirements of chrysanthemum for water can be summarized as "large demand, fear of water accumulation and drought resistance". So when watering, we should strictly follow this feature.
Water enough in summer, once in the morning and once in the evening. Do not water at noon. After flowering, the amount of water gradually decreases. In case of heavy rain, pay attention to drainage. In winter, watering should be reduced properly.
Finally, we must not accumulate water. We must not accumulate water. We must not accumulate water.
When changing pots, chrysanthemum should pay attention to the application of sufficient base fertilizer, which can choose the leftovers and rotten vegetable leaves at home.
From the beginning of autumn, the fat and water should be enough. Generally, the thin bone paste water should be applied once a week. When it is in bud, the superphosphate and 0.1% potassium phosphate solution should be applied again, and then the blooming flowers will be more colorful.
Pay attention to timely watering and loosening soil after each fertilization.
Picking heart is the main technical measure to promote chrysanthemum branching. If you don't pay attention to picking the heart, it will make the chrysanthemum grow disorderly and affect the growth potential of chrysanthemum. Pick heart work should be carried out in sunny weather. In rainy weather, the wound is easy to rot or mildew, so it is not suitable to pick heart.
In the first time, when the root system of chrysanthemum seedlings has been formed, that is, about 3 weeks after cutting, the top shoots that have not been carried out can be removed.
When 4-5 leaves are grown, the weak leaves are removed and then the heart is removed once every 1 month or so. After the end of August, stop picking the heart, select and keep the sprouting branches with good growth potential, and cut off the surplus to prevent the waste of nutrients.
After each heartpick, it is necessary to apply a compost once to make the lateral buds sprout healthily.
From July to August, the potted chrysanthemum will be moved into the darkroom in the afternoon every day to completely cut off the light, and the sunshine will be controlled within 8-10 hours in the whole day, but the dew will be seen in the outdoor ventilation at night, and the night temperature will be controlled between 15-28 ℃.
After 50-70 days, the flower buds can be seen, so that the chrysanthemum flowers in advance to the National Day in October. If there is no darkroom, black paper or black cloth cover can be used instead of shading, but the lower part shall not leak light completely.
That is to say, when the chrysanthemum buds in early September, use the light to supplement the light. Use a 100 watt (W) light in the evening. When the illumination is increased for 2-3 hours within one meter from the plant, the flower bud formation of chrysanthemum is inhibited, and the illumination stops in November, the flowering can be postponed to December.
In a word, in a word, we must remember that chrysanthemum is a plant with short sunshine. If there is too much light, it will not bloom.
