"Steroids are a general term for a large group of derivatives widely distributed in the biological world, which can also be called steroidal or steroidal compounds. Steroid hormones are mainly synthesized and secreted by various parts of the body, and a small part can be synthesized artificially. They play an important auxiliary role in the functional activities of organs, tissues and cells of the body. Steroid hormones mainly include adrenal cortical hormones secreted by the adrenal cortex and gonadal secretion of sex hormones, when taking a large number of steroid hormones, will produce swollen face, nausea and other side effects
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If sugar beet plants experience poor fertility during their growing season, top-dressing with fertilizer is recommended when the initial base fertilizer was insufficient. Based on years of field experience, the author believes that the later the top-dressing is applied, the less effective it becomes in boosting yield. Applying too much fertilizer at a late stage can cause the beets to turn green, which negatively affects both yield and quality. Normally, deep-coated fertilizer is applied by digging small holes 5–7 cm deep next to the seedlings using a small hoe or shovel. The fertilizer is then placed into these pits. The amount of top-dressing depends mainly on the quantity of base and seed fertilizers already used, as well as the growth condition of the sugar beet plants. If the soil is weak or if the plants show signs of nutrient deficiency, it is generally advised to apply around 15–20 kg of urea per mu. It's best to finish top-dressing by early August.
The author also suggests that mid-season fertilization not only allows the roots to absorb nutrients from the soil but also helps deliver low-concentration nutrient solutions into the plant through the leaf cuticle, stomata, and cells. This method can effectively supplement essential nutrients, enhance the leaves' ability to synthesize sugar, and speed up the transport and storage of sugar from the leaves to the roots, ultimately increasing both root yield and sugar content. According to trials conducted in Wanquan County, applying fertilizer outside the beet roots increased root yield by 8–12%, raised sugar content by 0.2–0.8 degrees, and boosted total sugar production by 10–15%. The results were highly significant. However, the concentration of the fertilizer solution should not be too high. A typical potassium sulfate concentration ranges from 0.6% to 1%, superphosphate from 2% to 3%, and potassium dihydrogen phosphate from 0.2% to 0.3%. When the leaf area is small, less solution is needed, while for plants with large foliage and dense canopy, more fertilizer should be applied. In general, the volume of sprayed solution should be between 20 and 40 liters per acre. It’s important to choose sunny, windless days with no dew for application. Leaves tend to wilt at noon, reducing their ability to absorb nutrients, so it’s best to apply fertilizer after they have fully recovered.