How to make tube shed spring cabbage early maturing and high yield

The key to spring cabbage cultivation is to prevent vernalization bolting, and to mention the morning market. After years of exploration, the vegetable farmers in this area have basically grasped the growth pattern of spring cabbage, and generally they can grow successfully and obtain high yields. The key measures are as follows:
1, choose the appropriate variety. Generally can choose to use Japanese spring general, South Korea strong, Chunhui and other varieties, these varieties are strong in winter, the growth period is short, resistant to bolting, high ball uniformity, disease resistance, and concentrated harvest, suitable for spring cultivation.
2, sowing early. Because of the cultivation in the greenhouse, the temperature in the greenhouse is relatively high, so it can be sowed early, so that it can be sown in the middle and early March, and early in the middle of February. Early sowing can cause early bolting, too late sowing, and harvesting. The high temperature in the shelter can cause soft rot and other rotten vegetables, affecting the quality of listing.
3, improve the method of raising seedlings. The use of small sheds in the pipe shed to cover the heat preservation seedlings and raise the seedbed temperature. Seeds are sown directly in plastic nutrients or clods. Before sowing, the nutritious bauxite should be filled with water, each seed should be sown. After sowing, a thin layer of nutritious soil cover is used to cover the seed without mulch film, and the small ring shed film is heat-insulated, and the electric heating line is laid under the ramie. Electricity, increase the temperature, promote seedlings. During the seedling management, attention should be paid to improving the ground temperature and temperature of the seedbed to maintain it at a temperature of 10°C or higher, preventing vernalization, and 25 to 28 days for seedlings.
4, early colonization. Planted in tube sheds in mid-March. Planting sheds to apply basic fertilizers, usually 250,000 to 3,000 kilograms of organic fertilizer applied in Mushi, 50 kilograms of fertilizer for vegetables, or 350 to 400 kilograms of organic fertilizer for Mushi basal fertilization, full plough layer fertilization, 6 metre wide standard shed for 3 畦Each row is planted with 4 rows, spacing 30-35 cm, and covered with plastic film. When planting, Chinese cabbage seedlings have three leaves and one heart. After planting, take a small ring to cover the film. When the temperature is low, cover the non-woven at night when the temperature is low. Cloth insulation.
5, field management. In addition to strengthening insulation after planting, focus on good management of fertilizer and water, small greenhouse film can cover about 20 days after the cover can be removed, after planting live trees top dressing 1, with 0.5% urea water pouring root, before the application of heavy fertilizer 1 Times, the general point of urea 15 kilograms of urea, with a knife Chen into the root, then water soluble fertilizer. In the shed, due to the lack of rainwater, water should be taken care of. During the ball stage, the soil should be kept moist and there should be no shortage of water. Watering should be stopped 7-10 days before harvest. It was found that the locusts and green worms should be treated with drugs in time.
6, timely harvest. Spring cabbage early maturing varieties can generally be harvested in mid-to-late April. Generally, harvesting is completed at the beginning of May, and the harvesting period is relatively concentrated. At this time, Chinese cabbage is in short supply. The market is relatively easy to sell, and the average yield per mu can be achieved. 3000-4000 kg.

February 5, 2006

From the side of the ship one or two suction pipes descend to the bottom of the seabed. On the end of the pipe a so-called trailing Drag Head is connected. This head is comparable to a large vacuum cleaner and is trailed along the seabed. In the head there are nozzles connected to a high pressure water installation that are capable of loosening the material on the seabed. Due to lower pressure in the pipe, the material will be sucked inward and discharged in the hopper.

The vessel should always have a positive speed over the ground. It is possible to regulate the density of the sucked substance. If the head is lowered, more material will be sucked but there is a greater possibility of damaging the installation because the material can get stuck inside the pipes. Once the mixture is loaded inside the hopper, the substance will sink and the water is discharged overboard, creating more room for extra substance. A trailing Suction Hopper Dredger is only capable to suck relatively loose substance because the steel teeth are not so big. Harder substances such as rock, or ironbased rock must be destroyed by a cutter.

Photo of our Suction Pipe:

The specifications of our suction pipe

A. General

High accuracy, fully welded, painted construction can be used for trailing suction hopper Dredger , suction pipe plays an important role. It is approved BV 

Suction pipe system ensure full control of the drag head on the bottom, transport the dredge mixture to the hopper, then transmit the trailing force from the drag head to the ship and support pipes and cabling.

B. Construction and procedure

The construction is to be built according to the drawing with rules of good workmanship and to be built the longitudinal frame system.

The construction consist big suction pipes, Turning Gland, joint, jet line, Seamless Pipes, supports for cable and hoses, which are carefully manufactured and checked to ensure total length, straightness, symmetry within the specific tolerances.

C. Procedure

Welding seam preparation-Pre roll bending of plate tip-Rolling-Longitudinal welding (SAW),inside then outside-Crossing welding (SAW) between part tubes to form the whole pipe-US testing and repairing-Adjusting-Assemble other part

D. Materials

All fabricated steelwork used in the construction of the suction pipe will be to manufacturing standard of classification society BV, GL, LR, DNV, especially for neck flange.

All steel used to be blasted and shop primed both sides. Using DH36

All materials proposed will be selected to comply with the latest Health and Safety Rules.

Paint systems for hull protection will be of the highest quality (Hempel, Inter, Sigma, Jotun)

E. Welding

All welding will be performed in accordance with drawing and order and UniSite experience and all welding will be continuous and full penetration.

Welding seam preparation, welding method, welding material and consequent preheating temperature acc. to UniSite standards and approved by clients.

F. Workmanship

The workmanship have good marine practice. Care are taken to ensure fair lines, smooth surfaces and neat welding.

G. Main particulars

Suction Pipe

Dredging Suction Pipes,Suction Tube,Suction Connecting Tube,Pipe Joint

Unisite Group Ltd. , https://www.shipsparts.nl