Cultivation conditions of cut Chrysanthemum
1. Light.
Autumn chrysanthemum is a typical short-day plant. The vegetative growth stage generally requires sunshine not less than 14 hours, and the reproductive growth stage generally requires sunshine not longer than 12 hours. The brightening of cuttings can prevent the formation of flower buds prematurely. The time of replenishing light for chrysanthemum depends on the variety and the conditions of fertilizer and water for cultivation. The correct requirements for supplementary light are as follows: ⑴ has an incandescent light bulb of 100W every 3 meters, with a height of 1.5m to ensure that the weakest light is above 50LUX. ⑵ generally uses the method of replenishing light when the night is interrupted for 4 hours, that is, a long night is divided into two halves. If zero is the end of the night, then make up the light from 22:00 to 2 o'clock.
two。 Temperature.
Temperature has a great influence on the growth of chrysanthemum. Different growth stages require different temperature. Temperature plays an important role in the rooting of cuttings, and the seedling bed is heated at the bottom. Before rooting, the temperature was not lower than 21 ℃ in daytime and 18 ℃ at night. The lowest night temperature in the first 40 days after planting was not less than 16 ℃ and the highest was not more than 32 ℃. The temperature in daytime was 5-8 ℃ higher than that in night. During the period of flower bud differentiation, the lowest night temperature was 18-20 ℃. After flower bud differentiation, the night temperature dropped to 16-17 ℃, and the daytime temperature did not exceed 30 ℃.
3. Moisture.
Ensure adequate moisture after planting. When the seedling height is about 30 cm, watering should be controlled to ensure the smooth entry of flower bud differentiation, and the degree of water control should be slightly wilted in the lower leaves at noon. After the flower bud differentiation, namely the flower bud mung bean grain size, replenishes the moisture in time, must irrigate fully.
4. Carbon dioxide.
Under sunny winter conditions, sufficient carbon dioxide is needed in the greenhouse. The supply of carbon dioxide starts one hour before sunrise and stops one hour before sunset. There is no supply of carbon dioxide during ventilation.
5. Soil.
The PH value should be 6. 5-7. 0, which is suitable for sandy loam with good ventilation and drainage.
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