Where is Laver usually planted? What are the fertilization methods?

Porphyra is a kind of food that is often eaten in daily life. it is usually packed in the shape of a round cake in the supermarket. It is bought to make Seaweed and Egg Soup, which is very delicious and rich in nutrients, and is deeply loved by consumers. Where is Laver usually planted? What are the fertilization methods?

First, where is Laver generally planted?

The producing areas of porphyra yezoensis in China are distributed in coastal areas. Porphyra haitanensis is mainly cultured in Fujian and southern Zhejiang, while porphyra yezoensis is mainly cultivated in the north. Xiapu County, the hometown of porphyra yezoensis, is one of the oldest counties in Fujian, and it is also the earliest area in southern China to cultivate kelp and porphyra. As early as the Yuan Dynasty, Xiapu people have a record of cultivating porphyra yezoensis and have the national geographical indication of "Xiapu Laver".

In China, the most famous porphyra yezoensis is Rudong porphyra yezoensis. In September 2014, Rudong porphyra yezoensis was registered as a geographical indication trademark in Nantong City, Jiangsu Province.

What are the fertilization methods of porphyra yezoensis?

1. Spraying method

The sea water of 0.5%-1% fertilizer is sprayed into the fully floating raft culture area. In order to reduce the loss and improve the fertilizer efficiency, spray fertilizer and water on the Laver net curtain as much as possible, and increase the frequency of sprinkling every day. Semi-floating raft culture, after the net curtain is dry and exposed to the water surface, spray 0.1%-0.2% fertilizer and water on the net curtain. The effect is better within 1 hour before the tide since the spraying time. After fertilization, the net curtain dried for too long, which was disadvantageous to the growth of porphyra yezoensis.

2. Immersion method

The soaking method is to mix the fertilizer into about 0.1% fertilizer sea water, put it in a larger container or cabin, soak the porphyra net curtain in the fertilizer solution for about 30 minutes, and then quickly hang the soaked net curtain on the floating raft. The effect of soaking method is better, but it costs too much labor and is generally combined with the sun net.

3. Hanging bag method

That is, the long plastic film bag is loaded with chemical fertilizer and hung on the floating bamboo or directly tied to the net curtain to make it dissolve and spread freely. Change fertilizer once for every tide. The bag-hanging method has a large amount of fertilizer loss, so it is suitable for large-scale breeding.

3. Key points of porphyra cultivation

The main enemies of porphyra yezoensis during the growing period are plant moss, filamentous green algae, diatoms, etc., epiphytic to the net curtain, encroaching on the seedling position, fighting for nutrition, shading, mixed algae are difficult to distinguish, affecting the quality of dry products, and the animal species of class nematode fishes, goldfish, Niangai fish and other direct algophagous bodies are very harmful, pest removal methods, if small seedling epiphytic algae, can be exposed to strong light for 12 hours and then put down in the sea This kind of algae turns white and dies in water. The animal enemy damage is mainly in the open sea area, and the main removal methods are to drive, bomb and hang explosive bags. There are also bacterial green rot, due to high temperature, too dense water flow and other factors, so that the Thallus rot turns green, serious when the whole sea area rotten. Emergency measures: immediately adjust the water layer, sun the net for more than 20 hours and then put it back into the sea.