The growth and development of lotus roots were divided into three periods, namely, germination stage, prolonged period and crusting stage, and germination stage appeared from plant sprouting to standing leaves. After the leaves, the new roots grow, mainly relying on the stored nutrients; the prolonged period from the plant leaves to the beginning of the knot, the nutrient demand is large, is the key period of topdressing; the knotting period from scab to harvest, Lotus seeds develop synchronously, nutrient absorption decreases, and stem and leaf nutrients are mostly transferred to earthworms and lotus seeds. Therefore, a total of 3 fats are applied. Before planting, the base fertilizer will be turned into the field. Generally, the high-quality farmyard manure is 2000~3000 kg, and the general compound fertilizer is 40~50 kg. There are 2 times of topdressing. The first time is the vertical leaf fertilizer. When there are 3~5 pieces of standing leaves in the field, the application of nitrogen and phosphorus compound fertilizer is 25~30 kg; the second time is when the field is full of leaves, the application of nitrogen and potassium compound fertilizer 30 ~35 kg.
In addition, the fertilization of shallow-water paddy fields and deep-water paddy fields is different. Shallow paddy fields can be used for both compound fertilizers and simple fertilizers. Drainage before application, fertilization in shallow water, and restore the water layer two days after application. In deep-water fields, it is better to mix the compound fertilizer with the soil to prevent the fertilizer from floating.
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