Winter Seedling Technology of Sweet Potato

The winter seeding method for rapid seedling of sweet potato is simple in equipment, easy to understand, and high in the rate of emergence. It is 15-20 days earlier than seedling raising in seedlings, especially suitable for raising seedlings of farmers. one. Seedbed construction 1. Bed site selection: Select the site where the leeward sun is sunny, the terrain is high and dry, and the land is fertile. 2. Preparation: Each seedbed is prepared with 1.7 meters long and 1.3 meters wide lumps, semi-mature livestock manure mixed with vegetable garden soil (ratio 7:3) 0.8-1 cubic meters, plus a small amount of fine sand, more than 40 bricks, no Transparent plastic film (4.5 meters long, 2.7 meters wide), a grass curtain (length 4.3M, width 2.7M), 5 wood. 3. Construction method: 1 Construction of heat-collecting and heat-retaining tanks. On the selected site, excavate an east-west trough with a length of 4 meters, a width of 2.3 meters, and a depth of 0.5 meters. The excavated soil is placed around the trough. The north is 1 meter high and the south is 20 centimeters high. The east and west sides are in a slope-like shape. The wall is painted with a proportion of 7:3 pulverized coal and stone carbon powder. In the middle of the trench, an east-west trench with a depth of 17 cm and a width of 17 cm is dug. The ditch is connected to the exhaust windows at both ends of the east and west, and the ditch is tightly closed. A hole with a diameter of 17 cm is left at 13 cm from the east and west walls. The exhaust window on both ends has an internal diameter of 17 cm and is 67 cm above the ground. 2 Set up seedbeds, place "eight" shaped bricks on the heat-insulated surface, each block is 67 centimeters away from the east and west walls, 33 centimeters from each of the north and south walls, and 33 centimeters apart from each other. Spread 17 centimeters thick half above the block. Decompose livestock manure and vegetable garden soil, then spread 3 cm thick sand, and lay a layer of straw dyed with pulverized coal and carbonaceous pulp on the ground around the trench wall as an auxiliary heat sink to keep it moist. The heat-absorbing material near the east and west walls is 33 centimeters wide, 17 centimeters wide on both sides of the north and south, and 13 centimeters thick. 2. Place planting potatoes to pick disease-free, insect-infected and injured sweet potatoes as seed potatoes. When the potatoes are drained on a sunny day, the bottom dung and sand should be sprayed wet, and the humidity should be pinched into groups. After soaking seeds that have been soaked in warm soil, they should be drained on the sand. The seed potatoes should be discharged neatly, and they should not be turned upside down. Spray with 70% thiophanate-methyl or 50% carbendazim 600 times. To slowly move the spray, soaked under the potato block soaked to prevent black spot. Cover the sweet potatoes with 3 cm thick sand. Cover the sand with 8 cm thick manure and spray wet with water. Spread 13 cm thick straw or rice straw on the manure, and evenly thicken the straw around the potato bed. The thinner the better. Then take the stem, cover the membrane, tightly around. 3. After the seedbed management cover film, the temperature under the nocturnal membrane can reach 40°C at noon on sunny days, but the temperature of the lower air rises slowly. To reduce the temperature difference between the upper and lower layers, the exhaust window can be opened. When the upper and lower temperatures are balanced, the exhaust window is blocked. Before sweet potato germination, as long as the seedbed temperature does not exceed 40 °C, do not remove the film; after germination, the bed temperature should be maintained between 32-35 °C. If it is higher than 40°C, the film should be peeled off and cooled. After the seedlings were established, the bed temperature was maintained at 25°C and the film was removed from 9:00 am to 4:00 pm on a sunny day. After two leaves are grown, 0.3% urea solution and 0.1% of 50% Chlorhexidine are used to inject the seedlings. After each extraction, the seedlings will be splashed once. . If the seedlings grow stoutly, they can be splashed once every three to five days. If there is no strong wind, cold or rain, you can uncover the seedlings during the day and night. Do not water the seedlings during budding; if the seedbeds are short of water after germination, you can At 10 o'clock in the morning, suitable amount of warm water was sprayed and the potato seedlings grew rapidly.

Piercing Tools

Piercing Tools, Sterilized Disposable Stainless Steel Body Piercing Needles, China Piercing Tools

Yongkang HOBO Tattoo Equipment Manufactory , http://www.china-tattoomachine.com