Pay attention to the time of fertilization in lotus root field:
During the growth and development of lotus root, topdressing is usually 2~3 times.
When the leaves first appear, 750~ 1000 kg of human excrement can be obtained per mu after intertillage weeding.
The second topdressing was carried out at 5~6 leaves. Urine fertilizer made from human excrement is about 1000 kg per mu.
The third topdressing is carried out at the time of leaf emergence. Apply human manure 1500 kg per mu and rice cake fertilizer 30~50 kg.
Second, the lotus root field fertilization matters needing attention:
1, fertilization is sunny, windless, and there is no scorching sun at noon.
2. Drain water before fertilization, and then irrigate after the fertilizer absorbs water.
3. In deep water lotus root field, fertilizer is easy to be lost, so liquid fertilizer can't be used directly, but solid fertilizer should be used. Reuse horse manure and grass manure and bury them in the mud.
4, fertilizer for topdressing, first of all, the fertilizer and mud should be fully mixed, made into fat mud blocks, and added to the lotus field.
Third, the occurrence and control of lotus root diseases:
1, etiology and symptoms:
After 5 years of shallow water lotus root continuous cropping, due to poor soil ventilation conditions, trace elements such as copper, iron and zinc are difficult to meet the growth needs of lotus root. With this organic fertilizer, it will be less anyway.
The onset of this physiological disease starts in mid-May, and the peak of the disease is July-August, which is the full flowering period. At the first onset, the new leaves will wither slightly after coming out of the water, and the veins will gradually turn green and thin, and brown spots will appear at the edge of the leaves, which will gradually expand until the whole leaves die.
2, prevention and treatment methods:
Breeding for 3~4 years is the fundamental way to prevent lotus root diseases. In the process of daily fertilization, the amount of nitrogen fertilizer is controlled with organic fertilizer as the center. When the water quantity of lotus root is sparse every spring, copper sulfate 1 ~ 1.5 kg, iron sulfate 2 ~ 2.5 kg and calcium magnesium phosphate 25 ~ 30 kg are used per mu, and the fine soil is scattered.