Daejeon chrysanthemum technology essentials

The varieties can be selected from the varieties of late autumn chrysanthemum and winter chrysanthemum that are not easily affected by freezing. The cold resistance is strong, the petals are thick and hard, the stems are thick and straight, the leaves are even and the leaves are thick and flat, suitable for long-distance transportation and storage, and can absorb water Upright and rejuvenated, fully open and long after soaking. Production of cut chrysanthemum in northern China, if it is to supply the market in May, should be planted in October of the first year and cultivated in the greenhouse in winter; if it is to bloom in August-September, it can be nursed in March of that year and shortly 60 days in advance. Sunshine treatment. It is easier to supply chrysanthemum cut flowers in the winter and early spring in the south, without the need of greenhouses, and can be grown on a large area, but it is necessary to build stilts for waterproofing. Suitable shading at noon during the dry season can increase the length of the stem and facilitate the bottle insertion.

Pre-plant preparation chrysanthemum avoid water wet, field cultivation cut chrysanthemum, must be deep sorghum sorghum, with sorghum height 25 to 30 cm, sacral width of 1 to 1.2 meters is good, scorpion length does not exceed 30 meters. There must be a good groove around the plot, and the gutter should have a function of water storage and drainage so that the rainwater does not drain out and the rain stops without water. Cut chrysanthemums thrive and require large amounts of fertilizer. Applying long-acting organic fertilizers can loosen the soil and promote root growth. Cut flower chrysanthemum bounty continuous cropping, not with the same crops.

Planting cut-flower chrysanthemums has more than one copy, and Daejeon's export-oriented cut-flower chrysanthemums are generally cultivated on their own. Usually only about 60 plants per square meter are planted, with 4 rows per plant, 25 cm spacing and 6 cm plant spacing. When the chrysanthemum grows to a height of 30 cm, a 12×12 cm 2 plastic shallow net is used to make the main plant open web so that the chrysanthemum branches are evenly distributed.

Water management of cut chrysanthemum is very important for fertilizer and water management. In addition to proper watering of flower buds during development, dry and wet, dry and wet, and ditch irrigation and immersion should be used. Cut chrysanthemum has high planting density and consumes more fertilizer. In addition to applying basal fertilizer, it must often be top-dressed with watering. In general, nitrogen and potash fertilizers are the main fertilizers before budding, and phosphorus fertilizers should be applied afterwards. Dressing fertilizer should be applied thinly to prevent excessive fertilization. When the chrysanthemum plant turns to reproductive growth, fertilization can be suspended to facilitate flower bud differentiation. After budding, top dressing again.

Pruning and pruning should be strong and weak, remove branches, and axillary buds should be wiped off in time to reduce the consumption of nutrients and ensure that the plants reach a certain height. Immediately after budding, all buds below the bud should be removed. During the cultivation process, if there is a phenomenon of “willow leaf,” it should be picked up early to allow it to re-extract new skills.

Pest control The diseases and pests of cut chrysanthemum mainly include leaf spot and aphid. In the early stage of growth, fungicides should be used regularly to prevent the occurrence of various leaf spot diseases. When entering the reproductive stage, it is necessary to prevent powdery mildew and aphids from damaging the buds so as not to affect the quality of cut flowers. Chrysanthemum leaf spot disease has a long period of occurrence. It lasts from April to October, and it is the most severe case when rainfall is high before and after the beginning of autumn. After the onset, reduce the number of watering as much as possible. You can spray Bordeaux mixture or 500-fold solution of zein-zinc, and spray it once every other week. Before the flower buds pass through, stop spraying. The locusts must be sprayed before the occurrence of turfgrass to prevent them. After the onset of the locusts, they should be sprayed two or three times in succession, and they can all be eliminated.

Filling light late autumn chrysanthemum, winter chrysanthemum is a typical short-day plant, the length of light, the strength of the flowering and flower color have an impact. Chrysanthemum supplements light to suppress flower buds. Generally 6 m wide standard greenhouses can be planted with 4 poles, each row is hung with a row of incandescent bulbs with 60 watts and 1.5 to 2 meters apart, and the height is preferably 90 to 100 cm from the plants. Light is supplemented daily from 23 o'clock to 2 o'clock the next day. It usually starts at the end of August. The number of days to fill light must be determined according to the time of planting.

Harvesting and refrigerating when the buds dew 3 to 50%, suitable for flowering. Usually harvested in the early morning or early evening, this is conducive to preservation. The harvested chrysanthemums are immediately transported to fresh-keeping plants for pre-cooling, and the temperature is controlled at about 10°C. After the pre-cooling, the chrysanthemum is trimmed, and generally the stem length is about 90 centimeters, which is fed into the cold room in 10 units. Refrigerated wet storage and dry storage of two kinds. Wet storage is generally used for short-term storage. The method is to insert the stem into fresh-keeping liquid. The formula of fresh-keeping liquid is 20 grams of sucrose per liter of water, 25 milligrams of silver nitrate and 200 milliliters of 8-hydroxyquinoline citrate; Cut chrysanthemums are stored in plastic bags or cartons in cold storage. Note that it must not be placed in a cold store with fruit and vegetables to prevent the fruit from producing ethylene and affect the preservation of the flowers. Cold storage needs to maintain a relative humidity of 90% to 95%, and the temperature is controlled at 0°C to 17°C. It can be stored for 3 to 4 weeks.

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