Coriander Sunlight Greenhouse Cultivation Techniques and Management Key Points
Coriander, original name: cilantro (Coriandrum sativum), aliases: fragrant coriander, hu sui, an annual or biennial herb of the Apiaceae family, Coriandrum genus, with a strong odor, 20-100 cm tall. Root spindle-shaped, slender, with numerous fine branch roots. Stem cylindrical, erect, much branched, striped, usually smooth. Basal leaves have petioles; the stylopodium is erect when young and recurved outward when the fruit ripens. Fruit spherical, with the dorsal main ribs and adjacent secondary ribs prominent. Endosperm concave on the ventral side. Oil ducts not obvious, or 1 located below the secondary ribs. Native to the Mediterranean region of Europe; cultivated in China's Northeast, Hebei, Shandong, Anhui, Jiangsu, Zhejiang, Jiangxi, Hunan, Guangdong, Guangxi, Shaanxi, Sichuan, Guizhou, Yunnan, Xizang and other provinces and regions. The stems and leaves are used as a vegetable and seasoning, and have a stomach-strengthening and digestion-promoting effect; the fruit can be used to extract aromatic oil; the fruit is used in medicine, with effects of dispelling wind, promoting eruption of rashes, strengthening the stomach and resolving phlegm.
Traditional Chinese medicine holds that coriander is warm in nature and sweet in taste, can strengthen the stomach and promote digestion, induce sweating and promote eruption of rashes, promote urination and bowel movements, dispel wind and detoxify. "Compendium of Materia Medica" says: “Hu sui is pungent, warm, fragrant and penetrating, internally reaching the heart and spleen, externally reaching the four limbs.” "Luo's Huiyue Medical Mirror" states it can “dispel all unhealthy qi, disperse wind-cold, fever and headache, resolve food stagnation, regulate stool and urine, remove eye films, and promote the eruption of smallpox and rashes.” Modern research has found that the reason coriander is fragrant, and gained the fine name of fragrant coriander, is mainly because it contains volatile oil and volatile aromatic substances. Coriander is rich in nutrients; it contains vitamin C, carotene, vitamin B1, B2, etc., and also contains abundant minerals such as calcium, iron, phosphorus and magnesium. Its volatile oil contains mannitol, n-decanal, nonanal and linalool, etc., which can stimulate the appetite and invigorate the spleen. Coriander also contains potassium malate, etc. The amount of vitamin C contained in coriander is much higher than in ordinary vegetables; generally, eating 7-10 grams of coriander leaves can meet the human body's requirement for vitamin C; the carotene contained in coriander is more than 10 times higher than that in tomatoes, kidney beans, cucumbers, etc.
Key points for coriander sunlight greenhouse cultivation and management
1. Variety selection
Choose varieties with strong disease resistance, heat tolerance and high yield, such as Sijixiang cilantro, Korean large-stem coriander, Thai large-seed coriander, etc. 2. Sowing
According to local climatic conditions, determine the appropriate sowing period; generally in the Huang-Huai region it is from mid-October to early November. Apply 5000 kg of decomposed organic fertilizer per 667 sq m (1 mu), plow, harrow and level, and make flat beds 1.3 m wide. When sowing, rub the fruits apart to separate the seeds. Then disinfect the seeds by soaking them in warm water, and sow after drying. Use broadcast sowing; after sowing, rake level, tread firm and water; seedlings emerge in about 10 days. 3. Management key points
When the seedlings are 4-5 cm tall, thin and weed in time, remove twin seedlings, overly dense seedlings and diseased or weak seedlings, and maintain a seedling spacing of 4-5 cm. Generally do not water during the seedling stage; during the vigorous growth stage, water 2-3 times, preferably with light watering, not flood irrigation. Apply fertilizer with the water, generally applying decomposed human manure and urine or organic compound liquid fertilizer. Temperature control: daytime room temperature should not exceed 25 degrees C; if the temperature is too high, ventilate promptly; at night keep it at 10-15 degrees C, and it must not be lower than 10 degrees C. 4. Pest and disease control
The main diseases of coriander in sunlight greenhouses include damping-off, leaf spot and gray mold. In addition to paying attention to ventilation and light transmission and strengthening the management of temperature and humidity in the shed, spray pesticides promptly at the early stage of disease onset. In the evening, use 45% chlorothalonil smoke agent, 250 g per 667 sq m, ignite with a dark fire and smoke for 1 night; spray 50% sulfur suspension 200-300 times solution, 2% Wuyi mycin aqueous solution or 2% Nongkang 120 aqueous solution 150 times solution, etc. for control, once every 7-10 days, for 2-3 consecutive treatments. In addition, strengthen the control of aphids to prevent the spread of viral diseases; spray 10% imidacloprid wettable powder 1500 times solution or 20% fenvalerate 2000-3000 times solution for control. Note: stop using pesticides 7 days before harvest. 5. Harvest
When the plant height is about 40 cm and it has 18-20 leaves, harvest in batches as needed; coriander in sunlight greenhouses can also be harvested all at once. After harvesting, tie into bundles, put into plastic bags and sell on the market.