1. Fertilization time of lotus field
The lotus root usually grows 2 to 3 times during the period of growth and development:
The first time is when the standing leaves begin to appear. After cultivating and weeding, 750-1000 kg of manure and urine fertilizer is applied per mu.
The second top dressing is carried out when there are 5 to 6 standing leaves, and about 1,000 kg of manure and urine fertilizer is applied per mu.
The third top dressing takes place when the terminating leaf appears, and then the lotus root starts to be called the top dressing. Apply 1500 kg of manure and urine fertilizer per mu, and 30-50 kg of cake fertilizer.
2. Notes on fertilization of lotus field
1. Fertilization should be sunny, windless and airless, avoiding the noon in the hot sun.
2. Release the water before fertilization so that the fertilizer can be sucked into the water and then irrigated to the original depth.
3. In deep-water lotus fields, fertilizers are easily lost, and liquefied fertilizers cannot be directly applied, solid fertilizers should be applied. That is, re-apply stable manure or green manure and bury it in the mud.
4. When using chemical fertilizer for top dressing, first mix the chemical fertilizer with the river mud to make a fat sludge, and then apply it to the lotus field.
3. The occurrence and prevention of continuous cropping lotus root diseases
1. Etiology and illness
After 5 years of shallow water lotus root stubble, due to poor soil ventilation conditions, trace elements such as copper, iron, and zinc are difficult to meet the growth needs of lotus roots, and the application of organic fertilizers is relatively small, and nitrogen fertilizer is applied too much, which is very likely to induce physiological diseases. .
The physiological disease starts in the first and middle of May, and the peak period of disease is generally from July to August in the high season. At the initial onset, the new leaves appeared slightly wilted as soon as they came out of the water, the veins gradually became green and lightened, brown spots appeared on the edges of the leaves, and gradually expanded until the entire leaves died.
2. Prevention methods
Continuous cropping of the lotus field lasts for 3 to 4 years after tillage, which is the fundamental way to control continuous cropping lotus root diseases. In the process of daily fertilization, organic fertilizer should be the main control to control the amount of nitrogen fertilizer. At the same time, when the water field of the lotus field is thin every spring, 1 to 1.5 kg of copper sulfate, 2 to 2.5 kg of ferrous sulfate, calcium and magnesium are used per acre Phosphate fertilizer 25 ~ 30 kg bundle dry fine soil and scatter the hedge.
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