Causes of spring sowing of carrots and prevention measures

In recent years, with the growing demand for foreign trade exports and processing, the area of spring sowing carrots in China has been steadily increasing. However, improper selection of varieties and unsuitable cultivation techniques often lead to widespread issues such as root convulsions and a high number of deformed roots, resulting in significant economic losses. Based on recent field experiences, this article discusses the causes of these problems and provides practical measures to prevent them. **I. Causes of Root Convulsions and Prevention** Carrots are classified as long-day crops that require vernalization. Different varieties have varying levels of sensitivity to low temperatures, which can be categorized into easily convulsing types, moderately resistant types, and highly resistant ones. Varieties that are prone to convulsions may initiate flower bud differentiation when they have only 2 to 3 true leaves, especially under prolonged exposure to sunlight during May and June. According to research by Japanese scholars, the "Kuroda Five-inch" variety is particularly sensitive to cold stress, with convulsion rates exceeding 90% if seedlings are exposed to temperatures below 10°C for more than 360 hours. The lower the temperature and the longer the exposure, the higher the risk of convulsions. In most regions of China, spring-sown carrot varieties are still primarily selected from Japanese autumn varieties such as "New Black Five-inch" or the Kuroda Five-inch series. These are all high-risk varieties that are prone to convulsions. To minimize losses, it's essential to choose varieties that are less sensitive to low temperatures and more resistant to convulsions. **II. Causes of Deformities and Prevention** Deformed roots in carrots can include bifurcations, cracked roots, bent roots, nodules, green shoulders, hairy roots, and color changes. These deformities are often caused by poor soil conditions, inadequate cultivation practices, or unfavorable weather. For example, shallow planting depth, rough soil, or the presence of stones can cause root splitting and bending. Soil that is too compacted may lead to nodules and fibrous roots, while uneven water supply can result in cracked roots. Additionally, if the soil is not properly loosened during the root enlargement phase, and if high temperatures occur in July and August, it can cause an overaccumulation of carotenoids and lycopene, leading to discoloration such as white or yellow patches. To ensure high-quality and high-yield spring-sown carrots, it is recommended to select sandy loam soil that is loose and well-drained. The tillage depth should be at least 25 cm to allow for proper root development. Organic fertilizers should be fully decomposed before application, and irrigation should be consistent throughout the growth period. During the early stages of root enlargement, it's important to hill up the soil around the plants. Carrots grow best in temperatures between 18-25°C, so in northern China, spring planting is typically done from late March to mid-April. In southern and central regions, planting should be completed by mid-March to early April, depending on local climate conditions. Choosing the right sowing date based on local temperatures is crucial for successful cultivation.

Soybean Lecithin Oil

Soybean Lecithin oil is a byproduct of soybean oil production. It is a natural emulsifier and is commonly used in food, pharmaceutical, and cosmetic industries. Here are some related information about soybean lecithin oil

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