1. Causes of convulsions and prevention of vernalization of long-day sunshine crops with carrots. According to the different varieties' sensitivity to low temperatures, they can be divided into ejaculate varieties, more resistant varieties and resistant varieties. The easily-twitching cultivars can undergo flower bud differentiation when they are exposed to low temperature at 4-5 true leaves or even 2-3 true leaves at the seedling stage, and are then convulsed and flowered under long-term sunshine conditions in May and June. According to research by Japanese scholars, the "Kuroda Five-inch" type variety encounters the risk of convulsions when it experiences low temperatures below 10°C for more than 360 hours. The lower the temperature and the longer the duration of low temperature, the higher the convulsive rate. %the above. It is understood that at present in most parts of China, the spring broadcast variety still selects the Japanese autumn sowing variety “New Black Five-inch†or the Kuroda Five-inch series, such as the “Jiyang Five-inchâ€. These varieties are all easily convulsions. Therefore, in order to avoid losses, the spring sowing needs to select varieties that are insensitive to low temperatures and resist seizures, such as the “Red Fifty-inch†and “Xiangyang 2†in Japan, and the cultivation of root vegetables in Beijing Vegetable Research Center. The hybrid variety "Red Core No. 4" and the improved variety "Chun Hong No. 1" and so on. Second, the cause of the deformity and to prevent the malformation of carrot roots are common bifurcation, cracking, bending, nodules, green shoulders, long hair roots and color variation. The formation of carrot fleshy root requires good soil conditions, cultivation techniques and climatic conditions. If the cultivation layer is too shallow, the soil is rough and there are stones, or the application of organic fertilizer is not decomposed, easily lead to bifurcation, bending; soil viscosity is not easy to breathe, easy to produce nodules, fibrous roots; uneven water supply during growth, dry Humidification can easily lead to the increase of cracking roots; the plough layer is too shallow, and the root enlargement phase does not pay attention to soil, and the root enlargement phase is prone to high temperatures in July and August, resulting in the accumulation of carotenoids, lycopene, and color variation. White or yellow. Therefore, in order to obtain high quality and high yield of spring sowing carrots, sandy soil with loose soil and fertile soil should be selected. The depth of the tillage layer should not be less than 25cm. The base fertilizer should be applied with decomposed organic fertilizer, and the water supply should be even during the growth period and be in the fleshy quality. In the early days of root enlargement, pay attention to earth. The suitable temperature for carrot root expansion is 18-25°C, so the spring planting in the northern part of North China is generally conducted from late March to April 10. The southern and central parts of North China should be completed from mid-March to early April. The region needs to select a suitable sowing date based on the local temperature.
Sweet Potato Leaf Juice Vermicelli Bag
Sweet Potato Leaf Juice Vermicelli Bag
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