Off-season Cultivation and Management Technology of Coriander
1. Seed treatment
Coriander seeds are difficult to germinate under high temperature conditions. Soak the seeds with 300 times 1% carbendazim wettable powder for half an hour before planting, then remove and wash them, then soak the seeds in clean cold water for about 20 hours, and then germinate at 20-25℃ Farming later.
2. Soil preparation and fertilization
Choose a plot with convenient drainage and irrigation, loose soil and fertile soil. After the previous crop is harvested, it should be deep-turned 20-25 cm in time and exposed to the sun for 15 days. In order to facilitate the use of sunshade nets, a deep groove high border with a border width of 120 cm, a height of 20 cm, and a width of 30 cm is made. Coriander has a short growth period. Combined with soil preparation, 3500 kg of decomposed human excrement, 150 kg of cake fertilizer, and 50 kg of calcium-magnesium phosphate fertilizer are applied per acre as base fertilizer.
3. Farming in time
Cultivation of coriander off-season in summer and autumn is generally cultivated from mid-May to early July, with a planting amount of 1 kg per mu, which can achieve a higher output value and a higher price. When the soil moisture is suitable, cover 1-2 cm after evenly spreading. The grass thatch protects moisture and promotes seedlings, remove it after 5-7 days, and keep the soil moisture in the meantime.
Fourth, field management
The rising air in summer and autumn will affect the growth of coriander. Therefore, take off the grass thatch and put up a shading net in time. The shading net should be covered during the day and uncovered at night to strengthen ventilation to prevent the seedlings from growing slender and causing diseases. Because of the short growth period of coriander, early weeding, early thinning, and early recovery of available nitrogen fertilizer are appropriate.
Generally, thinning should be carried out about 7 days after the seedlings are finished. The seedlings should be fixed when there are 2 true leaves, and the seedlings should be separated by 2-3 cm. Generally, water is poured once every 8 days, and topdressing starts when the seedlings are 3 cm high, and 10-15 kg of urea and 250 g of boron fertilizer are applied per mu. In the future, apply carbon ammonia or urea 2-4 times in combination with the watering period, and increase the appropriate amount of potassium dihydrogen phosphate when applying foliar fertilizer in the later period to promote leaf growth.
5. Pest control
The control of pests and diseases of pollution-free coriander should be based on the principle of prevention first and treatment supplemented by a combination of multiple prevention and control methods to control pests and diseases to a minimum.
1. Agricultural control is based on species with strong disease resistance, and implements crop rotation to prevent crop rotation. Timely eradicate diseased plants and leaves in the field to reduce the chance of infection. Strengthen fertilizer and water management to improve plant disease resistance.
2. Physical and biological control application frequency vibration insecticidal lamp, sex attractant, Bt powder and other physical control skills.
3. Chemical control diseases mainly include damping-off at the seedling stage, viral disease at the adult stage, anthracnose and spot blight. 5 days after emergence, spray 1 time with a pollution-free fungicide 3% Polyoxine 800 times liquid, and then spray once every 7 days with 600 times Polyoxine liquid for a total of 2-3 times to prevent damping-off. Anthrax and spot blight. To prevent and control virus diseases, you can choose insect-proof nets to prevent the spread of aphids; choose shade to prevent high temperature and dry environments and reduce the occurrence of aphids; and spray 20 grams of 20% imidacloprid WP plus 50 kilograms of water to completely control aphids. Prevent the onset of viral diseases. Liriomyza spotted with 1% avermectin 1500 times liquid spray.
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