In the process of carrot planting, problems such as serious convulsions, cracked roots, and green heads often occur, which seriously affect the yield and quality. The causes and preventive measures are now described below.
After the early convulsions of carrots, the fleshy roots harden and lose their food value. The main cause was the low temperature during a certain period of time after sowing, which caused the plants to twitch early through vernalization. According to statistics, when there are 7 leaves in general, they can pass through the vernalization stage at a temperature of 4.5 to 15°C for 25 to 30 days, and then they can twitch and flower before harvesting. For the sake of pursuing the morning market in production, we often sow seeds blindly and cause carrots to pass through vernalization. To prevent carrots from convulsing prematurely, it is necessary to use varieties that are resistant to convulsions and to arrange the sowing date reasonably. In addition, lack of water, insufficient supply of nitrogen fertilizers, and serious pests and diseases may cause carrots to twitch prematurely, and water and fertilizer management and pest and disease control must be strengthened during growth.
The main cause of cracking is improper water management. During the swelling of carrot roots, the watering is uneven, the early water supply is insufficient, the fleshy roots grow slowly, and afterwards suddenly a lot of watering or a large amount of precipitation in a short time, the roots absorb water quickly and cause internal cracking. In this regard, carrot root swelling period should pay attention to water management, so that the soil see dry see wet, drip irrigation or sprinkler conditions can be poured before the onset of heavy rain, a small water. In addition, failure to harvest will also cause rooting, and production should be harvested when the root length of the flesh is 18 to 20 centimeters long and 3 to 4 centimeters thick.
The main cause of the green head is that the cover soil is too shallow and the roots of the fleshy roots do not pay attention to the soil during the process of root swelling, resulting in the top of the fleshy roots exposed in the middle and late stages of growth, and the chlorophyll turns green when exposed to sunlight. Use small ridges for single-row planting or for ridges and rows of carrots. After removing the mulching film, cover the soil in a timely manner. Do not cover the soil with too much soil and cover the top of the carrot. With the growth of carrots, the roots of the roots of the flesh will be exposed on the ground, and the soil will be covered again three weeks before the harvest. This will prevent the top of the fleshy roots from seeing light and form green heads. It will also allow the formation of blue heads to gradually return to normal after sighting.
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