First, the growth characteristics of seedling stage
The carrot seedling stage refers to the stage from the true leaf to the 5-6 leaf. The photosynthetic and root absorption capacity of this period was not strong, and the growth was relatively slow. A new leaf was only grown 5-6 days or longer. The response to growth conditions was sensitive, the growth was slow, and the ability to resist weeds was poor.
Second, the seedling period management center task
Ensure that there is adequate nutrition and fertile soil conditions, and with the corresponding weeding techniques to ensure the robust growth of seedlings.
Third, the seedling period management measures
1, timely check seedlings, make up seedlings, replant
Ensuring a sufficient number of seedlings is the key to high yields. Therefore, when the rate of dead seedlings in the field is above 60%, the seedlings should be destroyed in time. If the rate of dead seedlings is less than 50%, replanting should be carried out in time.
2, timely watering drainage and removing stains
Due to the high temperature and large evaporation, the carrots are sown shallowly and the roots are weak. The soil drought at the seedling stage may cause the seedling leaves to scorch and even the whole plant to die. However, over-wetness will cause diseases. Therefore, if you encounter hot weather, sooner or later to spray water in time, supplement the table plaque, to prevent high temperature hot seedlings; if you encounter heavy rain caused by the accumulation of water, timely drainage.
3, timely control of weeds
Carrot seedlings grow slowly and weeds grow rapidly. Therefore, weeding in time is the key to ensure the seedlings are full. In combination with seedlings for cultivating and weeding, weed herbicides can also be used. If the closed herbicide is not effective, it can be used in the 2-3 true leaves of carrots, and 10.8% of herbicidal energy can be used for 40-50 ml/mu; for malignant weeds, it can be diluted 10 times with 41% glyphosate. After the artificial spot painting; for the drill field, wide ridge, can be directed spray, but must choose the weather without wind.
4, suitable time seedling, Dingmiao
Seedlings and seedlings should be prepared in time for the seedlings of carrots so as to avoid competing for nutrients and lead to the growth of young seedlings. According to the carrot's performance characteristics, take the appropriate spacing, generally large radish varieties, spacing to maintain 13-15 cm, small carrot varieties to maintain 10-12 cm. Miao Miao should be carried out when 1-2 leaves, seedlings from 2-3 cm, pay attention to the removal of diseased seedlings, weak seedlings, insect seedlings, and in the rows of shallow cultivator, weeding, to promote seedling growth; Dingmiao should be 4-5 tablets When the leaves are combined with cultivating and weeding, the seedling distance is generally 10-17 cm, pay attention to weak and strong, and keep as good as possible the growth of strong seedlings. In production, the seedlings and Dingmiao must be carried out in two separates. Never avoid seedlings once. Also pay attention to the density of seedlings to be appropriate, too thin and easy to cause the heart is thick, coarse skin, cracking roots, too dense is easy to form short roots, generally early varieties, small meat root varieties should be more dense, otherwise thin.
5, timely control of pests and diseases
Seedling diseases include powdery mildew, black spot, and bacterial soft rot. The pests mainly include root knot nematodes, diamondback moths, and snails.
Carrot powdery mildew: Available 10% Pentathlodias suspension 1000-2000 times + 75% chlorothalonil wettable powder 600-800 times, 2% Ning Nanmycin water 200-400 times + 70% Senilian dry suspension agent 600-800 times liquid, spray on the water, spray once every 7-10 days depending on the disease condition, the drug rotation is used.
Carrot black spot: available 20% pyraclostrobin water dispersible granules 1000-1500 times liquid + 50% Ketan Dan wettable powder 600 times liquid, 25% bromotricozide wettable powder 500-1000 times liquid + 70% Propylene Zinc Wettable Powder 600-800 Times, 50% Methyl Sulphur Suspension 800-1000 Times + 70% Mancozeb Zinc Wettable Powder 700 Times, Spraying on Water, depending on the Disease Interval 7-10 days Spray Once, the drug is used interchangeably.
Carrot bacterial soft rot: 72% available for agricultural streptomycin sulfate soluble powder 2000-4000 times, 2% kasugamycin wettable powder 300-500 times liquid, 3% metobiotin wettable powder 600-800 times Liquids, etc., are evenly sprayed on the water, and sprayed once every 5-7 days depending on the condition.
Carrot root knot nematode disease: Use 48% chlorpyrifos EC 1500 times solution or 40% chlouprophosphate EC 1000 times or 1.8% avermectin EC 1000 times to irrigate roots, each irrigating 250 ml, depending on disease interval 7 - Once in 10 days, the agents are used interchangeably.
Plutella xylostella control method: 2.2% emamectin benzoate microemulsion 50 g (1800 times solution) or 2.5% rhodium-cypermethrin solution (kaffoldin) 60 g (1200 times solution) per mu ) Or spray control with 5% flubendiamide formamide suspension 100 g (1000 times liquid).
Snail prevention and control methods: artificial capture; trapping of vegetables and leaves, in the evening, setting up a number of larger leaves or fresh haystacks in the field, turning and catching in the early morning of the next day; throwing lime belt; using 6% acetaldehyde chemistry Method to kill.
No matter which kind of medicine, it must be used strictly according to the instructions of the medicine. The spraying time is generally selected before 10:00 in the morning or after 4 in the afternoon.
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