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Key points of column-free soilless cultivation in greenhouses

Tianjin-Longlong-Metal-Products-Factory (3)

1 Equipment materials

Greenhouses use reinforced concrete arches, which do not require column supports. The interior is spacious and convenient for installation and various operations. The nutrient solution pond is located at one end of the greenhouse below the ground level, and a length of 3 meters and a width of 1.2 meters are built. Nutrient solution pool with a depth of 1.6 meters. The structure is made of brick and mud, and the inner wall and bottom are smoothed, and the liquid does not leak outward. The outer packaging of the cultivation column is made of plastic woven cloth, rolled into a barrel shape with a diameter of 15 cm and a length of 1.7 m, and is stitched together. The upper mouth is open and the lower mouth is closed. Other equipment includes small circulation pumps, filters, water delivery mains with a diameter of about 5 cm, water delivery capillaries, bypasses, drip sprinklers, iron rings on cultivation columns, pipe plugs, and wire.

2 Installation of columns

In the greenhouse, the north-south brick-growing trough is 4.8 meters long, 0.5 meters wide, and 12 cm deep. A 0.5m wide working path is left between the slots. A 0.5-meter-wide backwater ditch was built with bricks at the south end of the cultivation tank from east to west, and a plastic film was placed on the bottom and four walls of each cultivation tank to prevent the leakage of nutrient solution, and then 4 cm thick ceramsite was poured. Use a 1.95-meter-high iron rod to pass through the bottom of a drum surrounded by plastic woven cloth to connect the two together. Fill the drum with organic substrate along the upper mouth until it reaches the top. Then add a round iron ring to the upper mouth and stitch it with the plastic woven cloth on the upper mouth. The iron rod of the cultivation column support frame will be more than 20 cm higher than the cultivation column barrel. It is used to install drip sprinklers on the top of the iron rod. This forms a complete cultivation column.

3 Assembly and fixing

The assembled cultivation columns are placed in cultivation tanks. Two rows of columns are arranged in each cultivation tank. Six columns form a row. Each row of columns is connected by thick iron wires in the north-south direction. The ends of the iron wires are fixed on the greenhouse building. Just in case of lodging. The axial distance between the two rows of columns in the cultivation tank is 0.75 cm, and the axial distance between the two rows of columns in the cultivation tank is 1 meter.

4 Connect the nutrient solution delivery system

Connect the nutrient solution delivery system in the following order: liquid storage tank—circulating pump—filter—main pipe—bypass—capillary tube—drip head—cultivation column—cultivation tank—backwater ditch—reservoir. The main pipeline of the nutrient solution delivery system is set along the upper end of the northern wall of the greenhouse. Capillary tubes and drippers are suspended from the top of the cultivation column, and the ends of each capillary tube are blocked with pipe plugs.

5 Preparation of nutrient solution

Leaf vegetable plant nutrient solution ratio (1 ton of water): 236 grams of calcium nitrate, 404 grams of potassium nitrate, 57 grams of ammonium dihydrogen phosphate, 123 grams of magnesium sulfate, 16 grams of ferric iron, 1.2 grams of boric acid, and 0.72 of manganese chloride Grams, 0.09 grams of zinc sulfate, 0.04 grams of copper sulfate, 0.013 grams of sodium molybdate, and EC values ​​of 0.85-1.3.

6 Crop planting

Simple soilless three-dimensional cultivation is generally suitable for the cultivation of short leafy crops, such as lettuce, rape, celery, etc. Before planting crops, punch holes in the cultivation columns, and evenly drill 40 holes in the 1.7-meter-high columns. Water is passed into the cultivation column through the nutrient solution transport system, so that the substrate in the column reaches a moist state. The vegetable seedlings to be cultivated in the greenhouse are planted in the cultivation holes.

7 Seedling management

The seedlings should be filled with clear water within three days after planting, and once a half hour in summer and once every one hour in winter, the duration of the water flow should be no less than 8 minutes, which will slow down the seedlings quickly. After the seedlings are slowed down, the nutrient solution is provided in the nutrient solution tank, and is regularly transported into the cultivation column. The initial concentration of nutrient solution should be lower appropriately. The interval of fluid passing should be 1 hour. Later, the concentration of nutrient solution should be increased to the required level. The interval of fluid passing should be controlled once every 2 hours. The duration of fluid passing is generally 8 minutes.

Tianjin-Longlong-Metal-Products-Factory (1)

Post time: Jan-21-2020

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