First, variety selection
Chrysanthemum morifolium, also known as chrysanthemum and chrysanthemum, is generally used in northern areas. The leaves are pinnate, completely split, with thin mesophyll and hard texture. The tender stems and leaves are edible, with strong cold resistance, short growth period and rich flavor, which are very popular with consumers and are very suitable for vegetable greenhouse cultivation in northern China.
Second, fertilization and soil preparation
Before sowing, apply 3000-5000 kg of decomposed farmyard manure, 50-70 kg of calcium superphosphate and 50 kg of ammonium bicarbonate per mu. Spread it evenly on the ground, make a flat bed after deep ploughing, the bed width is 1 ~ 1.5m, and tread lightly with your feet after watering to prevent sinking.
Third, prepare for sowing.
Choose vegetable greenhouse to plant Chrysanthemum morifolium, and it is best to sow it in early June from May 438 to February, so that the produced Chrysanthemum morifolium can be listed before the Spring Festival. At this time, the price of vegetables is generally higher, and it is easy to obtain higher economic benefits. Whether it is dry seed sowing or accelerated germination sowing, it can be divided into sowing and drilling. When drilling, the side ditch shall be 1 .5cm, and the ditch depth shall be1cm. Water the ditch with a basin, sow immediately after the water permeates, and evenly cover it with soil taken out of the ditch. After covering the soil, take out the topsoil of the adjacent seedbed to be sown to prepare for the next round of sowing. Generally, the sowing amount per mu is 1.5 ~ 2.0 kg.
Fourth, the management of chrysanthemum after sowing
1, control water and fertilizer
After sowing in vegetable greenhouse, the ground should be kept moist to facilitate the emergence of seedlings. When the seedlings grow to a height of 3 cm, they should be watered all over the head, and need to be watered 2 ~ 3 times during the whole growth period. Apply the first fertilizer when the seedling height is 9 ~ 12 cm, apply the quick-acting nitrogen fertilizer 10 ~ 15 kg with water per mu, and topdressing twice.
2. Control the temperature
The temperature of chrysanthemum in vegetable greenhouse can be slightly higher after sowing, which is 20 ~ 25℃ in sunny days and 10℃ at night, and it can emerge after 4 ~ 5 days, and 15 ~ 20℃ during the day and 8 ~ 10℃ at night, but the seedlings must be prevented from being burned at high temperature.
3, thinning seedlings
When Artemisia selengensis seedlings have 1 ~ 2 true leaves, it is appropriate to start thinning seedlings, and the seedling spacing is 4 cm square when sowing. By drilling holes, the seedlings that are too dense should be thinned out.
Verb (abbreviation for verb) disease control
The main diseases of chrysanthemum in vegetable greenhouse are leaf blight and downy mildew. Spraying 40% polysulfide suspension 500 times, or 70% thiophanate-methyl wettable powder 500 times, or 50% chlorpheniramine wettable powder 1500 times at the initial stage of onset. Once every 5 ~ 7 days, spray continuously for 2 ~ 3 times.
Sixth, harvesting
The harvesting of chrysanthemum in vegetable greenhouse can be divided into one-time harvesting and staged harvesting. One-time harvesting is 40 ~ 50 days after sowing, and the height of the seedlings is about 20 cm, and it is harvested on the ground. There are two ways to harvest in stages: one is sparse harvesting, and the other is to keep 1 ~ 2 side branches for harvesting. After each harvest, water topdressing once to promote the germination and growth of lateral branches, and harvest again every 20 ~ 30 days. Yield per mu per harvest 1000 ~ 1500 kg.