The growth and development of lotus roots are divided into three periods, namely the budding period, the prosperous period and the scarring period. Embryonic stage occurs from the sprouting of plants to the emergence of leaves, and new roots emerge from the rear leaves of the standing leaves, mainly through the storage of nutrients for plant growth; long-term growth from the plant leaves to the beginning of the scab, with a large demand for nutrients, is applied top dressing. During the critical period, during the period of knotting from harvesting to harvesting, alfalfa and lotus seeds developed synchronously, nutrient absorption decreased, and most stem and leaf nutrient transfer to alfalfa and lotus seeds. According to this, lotus root has to apply 2 top dressings in addition to Shiji Fei. The first time was vertical leaf fertilizer. When there were 3 to 5 leaves in the field, 25 to 30 kg of nitrogen and phosphorus compound fertilizer was applied per acre; the second time, when applying nitrogen to potassium fertilizer, 30~ 35 kg.
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