Porphyra yezoensis was originally planted in this way! Sharing of six major planting techniques

Porphyra yezoensis is a kind of marine algae with both nutritional value and economic value. It is known as "longevity vegetable" and "immortal vegetable", and has a broad market space. The cultivated species of porphyra yezoensis in China are porphyra yezoensis and porphyra haitanensis. Today we are going to talk about the planting technology of porphyra yezoensis.

I. basic conditions

1. Sea area selection: the sediment of the sea area should be sandy and muddy, the beach surface is flat, the specific drop is small, and the flow rate is 10 cm / s-30 cm / s. The water quality is fresh and the salinity is 22 ‰-30 ‰. The plug-in cultivation should be at low tide level, and the subtidal zone is OK.

2. Culture method: generally, plug-in culture is adopted in Zhejiang area.

2. Aquaculture facilities

The plug culture method is mainly composed of the following:

1. Net curtain: the net curtain is divided into mesh and strip network, the mesh is 2.0-18 meters long and 1.8-4.0 meters wide, and the mesh is not less than 25 cm, square or diamond; the strip net is 5 meters long, 4 meters wide and 7.5-8 cm apart.

2. Inserting pole: it is made of 7-12 cm diameter bamboo with a length of 7-12 m.

3. Buoy: bubble plastic or bamboo.

4. Cable: made of polyethylene, the length is more than 2 times the depth of the most wonderful part of the aquaculture sea area.

5. Float: made of silk polyethylene.

6. Hanging rope: made of polyethylene with a length of 5-10 meters.

Pile: made of iron anchor, wood or bamboo.

3. Seedling cultivation

The hanging of the seedling net should be carried out shortly before the tide, and the seedling net should be hung on the shelf with three layers of overlap. The seedling net hanging on the pontoon should be as flat and tight as possible. If the seedling net just hung up for a long time from the high tide, it can be sprayed with seawater to keep the seedling net moist. After the seedling net is hung, it needs to be inspected and managed every day, and the seedling net should not be loose or sagging too much.

In the sea area with more floating mud, or when there are more algae on the seedling net, the net should be washed and dried in time. After 30-40 days of cultivation, the net line is covered with 1 cm ~ 3 cm seedlings, which can be cultivated separately or refrigerated with refrigerated net technology according to the need.

IV. Daily management

1. Management of small seedling stage

The stage of 8-15 days is the emergence stage, which mainly increases the emergence rate and promotes the early growth, fast growth, completeness and less seedling loss of young seedlings. Is the critical time of the year, should pay attention to strengthen management and responsibility, generally use the sea on the third day to wash the net, dry dew, to the net once every three days after drying to the emergence of complete, to keep the net free of miscellaneous algae, no sludge attachment, this period is encountered in October spring, high temperature should pay special attention to adjust the water layer to prevent seedling death.

2. Thallus period management

The yield and quality of porphyra yezoensis culture mainly depend on whether the Thallus grows normally and the harvest time, and is related to the management level. Therefore, we should focus on the following links:

(1) promoting growth. After the seedlings have grown well, we should pay attention to adjust the water layer every day, dry dew time is not less than two hours, increase the photosynthesis time of Thallus, show the phenomenon of lack of fertilizer in the middle of the dense sea area, and properly spray urea.

(2) quality assurance. Improving the quality of dried porphyra is the key to increase production and income of porphyra. During the management period, attention should be paid to timely harvesting. Generally, porphyra yezoensis can be harvested for the first time when the Thallus grows to more than 20 cm, and then every 7-10 days, so as not to age the Thallus and keep the algae thin and soft.

(3) cutting and retention, in order to increase yield and income, the proportion of cutting and retention should be properly controlled in the first harvest of porphyra yezoensis, generally cutting out 1/2 of the Thallus.

V. Disease prevention

The following prevention methods are mainly used in the process of porphyra culture.

1. Reasonable control of cultivation density.

2. Refrigerated net technology: the more effective method for rotten disease is to replace the refrigerated net.

3. Increase investment in science and technology to cultivate disease-resistant and high-quality varieties

4. acid-alkali method and drying method to remove diatom: the acid-alkali resistance of porphyra yezoensis is much stronger than that of diatom.

VI. Harvest

40-50 days after collecting shell spore seedlings, the leaves of porphyra yezoensis can be harvested for the first time when the leaves grow to 20-30 cm, and then every 15 days or so. It can be harvested about 12 times in the whole culture period.