The general principle of management of the shallow water layer is: shallow, deep and shallow. After the planting of pods, the buds should be kept in shallow water in order to increase soil temperature and promote germination. Generally, it is better to keep the water layer 4 to 7 cm deep. With the appearance of the vertical leaves, the growth of stems and leaves of lotus root gradually becomes prosperous, and the water layer should gradually increase to 12 to 15 cm. When the terminating leaves appear, it indicates that the scab begins to fall and the water layer is gradually reduced to 4 to 7 cm to promote scab. The water level of Sham Shui Po is not easy to adjust. It is mainly to prevent flooding during the flood season. In particular, after the leaves are submerged, they should be drained within 8 hours to expose the lotus leaves to the surface to prevent drowning.
In the growth process of lotus root, especially during the early growth stage of shallow leeches, weeds, bovine felt, dwarf mushroom, tripodgrass, and four-leaf weeds are more in the paddy field and grow faster, affecting the growth of lotus root and weeding should be done in time. . In the past, we often used artificial cultivators to weed and weeding. The workload was large and it was easy to step on the buds of lotus roots. If chemical weeding is used, labor is saved, labor is saved, and there is no harm to lotus root.
In recent years, a number of safe and effective methods of weeding chemical weeding have been explored through experiments and are being promoted in production.
(1) Use 50% of Weiluosheng EC. When the lotus leaf is 30 cm above the water surface, take 100 ml of the drug, mix 5 kg of urea first, add 5 kg of fine soil, mix thoroughly, and spread it when the dew is dry. Tanaka. When spraying, Putian maintains a water depth of 7 to 10 centimeters, and maintains the water layer more than one week after application. The effect is good, and the potency period can reach more than 1 month.
(2) Select 12.5% ​​of Ganoderma lucidum, or 35% of spermatozoa to kill 40 ml, add 40 to 50 kg of water, mix thoroughly, and spray the weeds when the dew is dry. After 4 days, kill 3 to 4 leaves. Stage grass weeds have significant effects.
The nutrients needed in the growth and development of lotus root are on the one hand photosynthesis from lotus leaves; on the other hand, they come from the soil, and the original fertilizer in the soil is limited, and as the plant grows and develops, less and less, despite the Fish The feces and baits can provide a certain amount of nutrients for earthworms, but it is very small compared to the growth needs of earthworms. Therefore, it is necessary to top-dress fertilizers in time.
Lotus root grows for a long period of time, usually top dressing 2 or 3 times. The first time when the vertical leaves began to appear, after the cultivation and weeding, 750-1000 kg of human fecal urine fertilizer was applied per mu; the second time the top dressing was performed when there were 5-6 pieces of vertical leaves, and the human feces was applied per mu. About 1,000 kg of urine fertilizer. 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 per acre fertilizer 1500 kg, cake fat 30 to 50 kg.
Fertilization should be selected sunny and windless weather, to avoid the hot noon. Discard the field water before each fertilization so that the fertilizer can be drawn into the water and then refill it to its original depth. In Sham Shui Po, the fertilizer is easy to lose and cannot be directly applied to liquid fertilizers. The method of solid fertilization should be adopted, that is, the manure is reapplied 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.
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