CATDOLL : CATDOLL: How to calculate the acreage of laver cultivation?

Of course, the area required to cultivate one acre of seaweed is one acre. One acre = 666.667 square meters = 0.0666667 hectares.

Farming conditions

1. Choose suitable sea areas for aquaculture

It is advisable to choose a sea area with smooth tides, slight wind and waves, and located below the low tide and high tide line for breeding. The bottom is preferably sandy and muddy. The water quality is better in the sea area with more nitrogen and phosphorus. Generally, the nitrogen content of seawater is required to be more than 50 mg per cubic meter, and the specific gravity should be between 1.010 and 1.020.

(2) Make good arrangements for the setting up of breeding equipment.

1. The structure of the net curtain

It is advisable to use nylon and 30-filament polyester fiber to blend into six small ropes, and then weave them into 2X1.5 meter strip net curtains.

2. Disinfection and washing

Remove bleach. The new net curtain should be soaked in fresh water for 15 days, and the water should be changed 3 to 5 times to wash away the detergent residue in the original vinylon to avoid affecting the seedling attachment effect.

3. Marine area planning should be scientific

After selecting the sea area, the stocking area should be planned, especially in areas with many farmers. Care should be taken not to crowd the farmers in the same sea area. The row spacing and traffic trenches should be widened during planning. The row spacing should be more than four meters, and the traffic trenches should be 10 meters wide. Only in this way can the tides be unobstructed, and high yield and quality of aquaculture be achieved.

4. Shelf setting

Generally, the rack should be at an angle of 60 degrees to the flow direction and 40 degrees to the wind direction. Wooden stakes should be inserted at fixed points to show the good row spacing. Floating bamboos should be tied to both ends of the harvested mesh, and the floating bamboos and the net root rope should be connected. Generally, 7 to 14 net curtains are placed on the root rope, and a bamboo pole or a small wooden stake is inserted in the middle of each mesh, and each mesh is hung up with a small rope, so that the mesh will rise and fall with the rise and fall of the water.

(III) Timely stocking:

Generally, it is in late September or early October, when the cold air from the north moves south, and the best time to collect seedlings is when the second cold air arrives. High air and water temperatures are not conducive to spore germination and may even affect normal growth.

(IV) Management during breeding period:

1. Management during the seedling stage

The shell spores are collected after the nets are set up and put into the sea. The 8-15 days is the germination period, which mainly aims to improve the germination rate, promote the early growth, fast growth, completeness and less loss of seedlings. It is a critical moment of aquaculture in a year, and attention should be paid to strengthening management and responsibility. Generally, the nets are washed on the third day after being put into the sea. When the nets are dried, they are washed once every three days until the seedlings are fully emerged. The nets are kept free of algae and sludge. This period coincides with the October Indian Spring, and special attention should be paid to adjusting the water layer at high temperatures to prevent the death of seedlings.

2. Management during the thallus period

The yield and quality of laver farming mainly depend on whether the thallus grows normally and the length of time it takes to harvest, and are also related to the management level. Therefore, we must focus on the following aspects:

(1) Promote growth. After the seedlings have grown completely, pay attention to adjusting the water layer every day. The drying time should be no less than two hours to increase the photosynthesis time of the thallus. In the middle area of ​​the overcrowded sea area, there is a lack of fertilizer. You can spray human urine or urea appropriately. Add 100 kilograms of water to 1 catties per mu and spray it on the leaves of the net curtain. Do it once every three days for three consecutive times. Generally, the growth rate of 1 cm per day after the seedlings emerge is normal. When the water temperature is around 15 degrees, the daily growth can reach more than 4 cm.

(2) Quality preservation. Improving the quality of dried laver is the key to increasing laver production and income. During the management period, attention should be paid to timely harvesting. Generally, the first harvest of laver can be carried out when the thallus grows to more than 20 cm. After that, it should be harvested every 7-10 days. This will prevent the thallus from aging and keep the algae delicate and soft. After processing, most of the finished products meet the export standards.

(3) Cutting and retention. In order to increase production and income, the first time laver is harvested, the cutting and retention ratio should be properly controlled, generally cutting out half of the thallus. Laver is a low-level algae that uses photosynthesis to absorb inorganic salts in the water as nutrients to supply mesenchymal cells to develop into algae. Therefore, improper cutting and retention will directly affect the yield. The seedling collection technology has been reformed to absorb enough seedlings on the mesh. When harvesting, the long ones are pulled out and the short ones are retained.

3. Pest control

The main enemies of laver during its growth period are plant mosses, filamentous green algae, diatoms, etc., which are attached to the net curtains, invade the seedlings, compete for nutrients, shade, and make it difficult to distinguish the mixed algae, affecting the quality of the dried products. Animal pests include fish of the family of banded line, golden fish, and niangai fish, which directly eat the algae and cause great harm. The method of pest control is that if the seedlings are attached to plant algae, the net can be exposed to strong light for twelve hours before being put into the sea. This kind of algae will turn white and die in the water. Animal pests are mainly more common in offshore sea areas. The main methods of removing them are driving, blasting, and hanging medicine bags. There is also bacterial green rot. Due to high temperature, too dense water flow and other factors, the thallus rots and turns green. In severe cases, the entire sea area rots. Emergency rescue measures: Immediately adjust the water layer, dry the net for more than 20 hours, and then put it back into the sea for stocking.