Detailed Explanation of Key Field Management Techniques for Carrots

Carrots prefer cool environmental conditions, have few pests and diseases, and are extremely adaptable. Good field management practices are an essential part of ensuring a high yield, so how exactly should field management be carried out for carrot cultivation?

Weed Control Management

Carrots are light-loving, so weeding and thinning should be carried out early, and herbicides should be sprayed promptly to prevent large-scale cultivation from becoming overgrown with weeds. Use 750-1000 g of 25% nitrofen per 667 sq m, first dissolving it in a small amount of water, then diluting it with 100-200 times water, and choose a sunny day to spray the ground after sowing but before emergence; the weed control rate for annual weeds reaches 90%. Alternatively, when the seedlings have 2 true leaves, spray 100 g of prometryn plus 100 ml of napropamide mixed with 50 kg of water per 667 sq m. It is also possible to apply only prometryn: after sowing but before emergence, or when the carrots have 1-2 true leaves, use 100 g of 50% prometryn wettable powder mixed with 60 kg of water per 667 sq m for spray treatment; its control effect on monocotyledonous weeds reaches 100%, its control effect on dicotyledonous weeds is 98%, and its inhibition rate on carrot seedling growth is only 1%. When applying, the concentration must be controlled well and must not be excessive.

Density Management

On a sunny afternoon, pull out overly dense seedlings, poor seedlings and mixed seedlings. Carry out the first thinning when there are 1-2 true leaves, combined with shallow cultivation and weeding, with a seedling spacing of 3-4 cm; carry out the second thinning when there are 5-6 true leaves, with a seedling spacing of 10-12 cm.

Watering Management

Carrot seeds do not absorb water easily. When sown in different seasons, dry soil will delay emergence and cause missing seedlings and broken rows. From sowing to emergence, water continuously 2-3 times, keeping soil moisture at 70-80%. Carrots are relatively afraid of waterlogging, so drain promptly after rain. When carrots grow to finger thickness, that is, the fleshy root enlargement stage, it is the period of greatest water demand, and they should be watered promptly to prevent the center of the fleshy root from becoming lignified. Generally, water once every 10-15 days to prevent moisture from fluctuating too much. Timely and appropriate watering is very important for improving the quality and yield of carrots and preventing the formation of cracked roots and forked roots.

Fertilization Management

Before soil cultivation, apply sufficient base fertilizer, applying 3-4 t of organic fertilizer per 667 sq m, then plow deeply. During the carrot growing period, apply topdressing 2 times. To avoid "burning the roots," carry it out in combination with watering, using water to carry the fertilizer; use dilute fertilizer at the seedling stage and concentrated fertilizer later. Carry out the first topdressing 20-25 days after emergence, when there are 3-4 true leaves, applying 2-3 kg of ammonium sulfate, 3 kg of superphosphate, and 1-2 kg of potassium chloride per 667 sq m. After 25 days, apply the second topdressing, applying 7 kg of ammonium sulfate, 3-4 kg of superphosphate, and 3-4 kg of potassium chloride per 667 sq m.

Preventing Carrot Green Shoulders and Bolting

In the early stage of fleshy root enlargement, about 40 days after sowing, carry out hilling so that the roots are buried in the soil but the plant hearts are not buried, which can prevent the shoulder part of the carrot fleshy root from being exposed above the soil surface and turning green from sunlight exposure. When carrots enter the period of vigorous leaf growth, water and fertilizer amounts should be appropriately controlled, and intertillage and seedling hardening should be carried out to prevent excessive leaf growth and the occurrence of bolting. If bolting occurs, remove the bolt promptly to prevent lignification of the fleshy root from affecting quality.