The amount of base applied in Putian should be determined based on soil fatness, which is generally 1500-2500 kg for each mu, livestock manure or manure, or 3000-3500 kg for green manure. Multiple application of manure fertilizer can reduce red rust on the body and improve quality. In addition to sufficient organic fertilization, Sham Shui Po is also susceptible to phosphorus deficiency. It should also apply 30-40 kg superphosphate as base fertilizer.
Lotus root grows normally for 2-3 times. The first time when the vertical leaves began to appear, after the cultivator and weeding, 750-1000 kg of human fecal urine fertilizer was applied per acre. The second top dressing was carried out when there were 5-6 pieces of vertical leaves, and about 1,000 kg of human fecal urine fertilizer was applied per acre. The third top-dressing was carried out at the time of the termination of the emergence of the leaves. At this time, the start of the scabs was called the recovery of manure. Application of manure fertilizer per acre 1500 kg, cake fat 30-50 kg. Fertilization should be sunny and airless, avoiding noon in the hot sun. Before each fertilization, let go of the water so that the fertilizer can be drawn into the water and then refill it with the original depth. In the fields of Sham Shui Po, fertilizer is easy to lose, and liquefied fertilizers cannot be applied directly. Solid fertilizers should be applied. That is, reapply fertilizer or grass green manure, and buried in the mud. When fertilizing chemical fertilizers, the chemical fertilizers are first mixed with the river mud to make a slime and then applied to the fields.
Lotus fertilizer application technology introduction
After about 5 years in shallow water, even after a few days, due to poor soil permeability, trace elements such as copper, iron, and zinc are difficult to meet the growth needs of earthworms. This is due to less organic manure applied and more nitrogen fertilizers are applied, which can easily induce diseases. . The physiological disease originated in the middle and early May, and the peak period of the disease was generally during the sorghum season from July to August. At the time of initial onset, the newly emerged leaves showed a slight wilting at the surface of the water. The veins gradually lost their green and faded, and the edges of the leaves turned brown and gradually expanded until the entire leaf withered.
The prevention and control methods mainly include:
(1) Continuous cropping and ploughing after 3-4 years is the fundamental way to control physiological diseases.
(2) Increase organic fertilizer and control the amount of nitrogen fertilizer.
(3) When there is only thin water in Putian at the end of April, 1–1.5 kg of copper sulphate, 2–2.5 kg of ferrous sulfate, and 25–30 kg of calcium magnesium phosphate fertilization are used for every 667 square meters.
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