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After the kelp seedlings are transformed from a gametophyte to a pachytene, with the acceleration of the growth rate and the enhancement of photosynthesis, the requirement for free carbon dioxide in seawater is also increasing. The seawater pH value changes during the nursery process in the seaweed nursery. Seedlings in the late nursery generally grow to more than 1 cm. The demand for carbon dioxide soars. The supplementation with atmospheric carbon dioxide is far from meeting the needs of seedlings. The concentration of carbon dioxide in seawater is greatly reduced, and the pH value rises sharply, sometimes close to 9.0. . Carbon dioxide recorders measured that the greatest change in seawater composition during the nursery process was a decrease in carbon dioxide concentration.
The kelp is mainly using free carbon dioxide for photosynthesis. At the late stage of nursery, the intensity of photosynthesis increases, and the amount of carbon dioxide consumed also increases, making the free carbon dioxide in seawater extremely poor, the seedlings in a carbon-deficient state, and the oxygen partial pressure too high. Under strong light conditions, chlorophyll is easily oxidized and bleached. This phenomenon is known as photooxidation. The reason why the light is too strong in the middle and late period of breeding can be caused by the symptoms of "self-sharpness" and "self-corruption".
After analyzing the carbon dioxide content of seawater by a carbon dioxide recorder, at present some production units, in order to reduce the pH of the nursery water at the later stage of nursery, add baking soda (ie, sodium carbonate) to the sea water. Actually, it is artificially increased. Carbon dioxide fertilizer. Because of the addition of baking soda, there will be a new balance between the amount of carbon dioxide in seawater, and bicarbonate will dissociate to produce free carbon dioxide. Taking sodium bicarbonate as an example, it forms free carbon dioxide for plant use. Therefore, adding carbon dioxide to seawater is a better way to artificially add carbon dioxide fertilizer.
Analysis of CO2 Demand for Artificial Breeding of Laminaria by CO2 Recorder
People have been very experienced in the artificial breeding of kelp. They are generally very concerned about the nutrient supply of nitrogen and phosphorus. The problem of seedling rot in the process of nursery is always a phenomenon. After a long period of research, it has been found that carbon dioxide has a very obvious preventive effect on the rot of seedlings. However, people think about carbon dioxide that can improve the survival rate of seaweed seedlings and promote their growth. It is necessary to discuss and discuss the carbon dioxide system balance in seawater, changes in carbon dioxide concentration, and the addition of carbon dioxide. Carbon dioxide recorders have very accurate results in the analysis of carbon dioxide content.