2. Material preparation: Each mu of lotus pond needs 5 tons of lime, 5 tons of cement, 30 tons of sand, and about 230 prefabricated blocks with a thickness of 50 cm ×70 cm and 5 cm, with a total cost of 4,000 ~ 5,000 yuan per mu.
3.build a swimming pool. (1) Digging pond: Excavator or manual digging pond is used, with the pond depth of 60 cm and the slope of the pond wall of 60 degrees. (2) Hammer bottom smashing: lime is sprinkled into the bottom of the pond and rotated by a rotary cultivator for 2-3 times with a depth of 20 cm. After the soil and ash are mixed evenly, the bottom of the pond is leveled mechanically and compacted, and the wall of the pond is compacted with 3: 7 lime soil. (3) Film laying: After the hammer bottom is smashed, film is laid on the bottom and wall of the pond. (4) Laying: After laying the membrane, smooth it with 2 ~ 3 cm thick concrete. (3) Vertical inclined plate: Stand the prepared inclined plate on the wall of the pond and wipe the seam with cement, and the lotus root pond will be finished.
Soil preparation and fertilization
1. Straw spreading: Before planting lotus roots, spread wheat straw, corn straw or weeds in the pond with a thickness of 30-40 cm, and use crop straw1.25-1.5000 kg per mu, about 25 mu.
2. Fertilization: Before the lotus root is drained, 5000 kg of soil miscellaneous fertilizer, 75 kg of diammonium phosphate, 50 kg of potassium sulfate and 20 kg of urea are evenly mixed with the mulch and then evenly covered on the straw, with a thickness of about 12 cm.
Selection and planting of lotus root
Selection of lotus root: Early-maturing varieties with smaller lotus root and leaves should be selected for shallow water lotus root, such as Jinan White Lotus Root, Erian No.4 and No.5, etc. Seed lotus roots are usually dug before planting, and the whole lotus roots with lotus roots that meet the characteristics of this variety are selected as lotus seeds, and the sub-lotus roots must grow in the same direction, so that the lotus buds can be regularly extended. Be careful not to damage the terminal buds when digging lotus roots. Seed lotus root is generally cut off at the lower half inch, and it is forbidden to break it by hand to prevent the soil from pouring into the lotus root hole and causing rotten seeds. After digging the lotus root, spray 400 ~ 500 times of 50% carbendazim solution on the seed lotus root and leave it for one day to prevent corruption.
Planting lotus roots: It is not too late to plant lotus roots in Grain Rain during the Qingming Festival. Use about 300 kilograms of lotus root per mu, with row spacing 150 ~ 200 cm and plant spacing of 60 ~ 100 cm. Arrangement method of lotus roots: arrange lotus roots according to the specified plant spacing. Generally, lotus roots are buried with straw to the depth of 12 ~ 15 cm, and then the nodes are slightly inclined on the water surface, and the temperature is raised by sunlight to promote germination. Lotus roots can be arranged in many ways, some in one direction, and some %A rows are arranged in the opposite direction.