The nutrients needed by lotus roots in the growth and development process come from the photosynthesis of lotus leaves on the one hand; on the other hand, they come from the soil, and the original fertilizer in the soil is limited (including base fertilizer), which will become more and more important as the plant grows and develops. Although fish manure and residual bait can provide a certain amount of nutrients for the lotus root, it is very small compared with the growth requirement of the lotus root, so it must be topdressed in time.
The lotus root has a long growth period and is generally top-dressed 2-3 times. The first time is when the standing leaves begin to appear. After cultivating and weeding, 750-1000 kg of human excrement is applied per 667 square meters. The second top dressing is carried out when there are 5-6 pieces of standing leaves, and about 1,000 kg of human excrement is applied per 667 square meters. The third top dressing is carried out at the end of the appearance of leaves, at which time lotus root formation begins, which is called top dressing. Per 667 square meters, 1500 kg of manure and urine fertilizer and 30-50 kg of cake fertilizer are applied.
Fertilization should be carried out in sunny and windless weather and avoid noon in the hot sun. Before each fertilization, let go of the field water so that the fertilizer can be absorbed into the water, and then refill to the original depth. In deep-water lotus root fields, fertilizers are easy to lose, and liquid fertilizers cannot be directly applied. Solid fertilizers should be used. Reapply manure and bury it in the mud. When using chemical fertilizers for top dressing, first mix the chemical fertilizers with the river mud thoroughly to form a fat mud mass, and then apply it to the lotus root field.
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