The frequency of water changes in ponds is large, and a large amount of wastewater must be discharged at the time of harvest. Hydroponics of vegetables and flowers on the surface of ponds can purify the pond water quality, reduce wastewater discharge, save energy, increase the economic benefits of aquaculture, social benefits and ecology. The role of benefits. Dr. Yinlin Li, Director of the Resources and Ecological Environment Research Department of the Provincial Academy of Fisheries Sciences, has long been engaged in the study of intensive pond ecological restoration techniques. He conducted hydroponic vegetables and flowers on the fish pond surface from June to October 2007 to purify water quality. The reporter asked him to introduce this kind of ecological pond culture technology.

Reporter: Which plants can grow on the surface of fish ponds, what is the growth situation?

Meson Lin: Hydroponic plants can grow on the surface of fish ponds, but the growth of different plants in fish ponds is different. Among them, there was no significant difference between the water spinach, loofah, and canna and the terrestrial conditions, especially the growth of the water spinach was more luxuriant. Lettuce, cucumber, Chinese cabbage, Shanghai blue, sponge gourd, bitter gourd, edible fungus, tomato and rubber tree can basically grow normally in the pond water culture, but the growth situation is worse than the terrestrial situation. The three flowers of Clivia, Aloe Vera and Anthurium can survive in hydroponics in the fish pond, but their growth is significantly worse than that in the terrestrial environment.

Reporter: Which pond water is most suitable for hydroponic plants?

Jie Zilin: Intensive breeding ponds, such as the high yield ponds in Zhengzhou, Luoyang, Kaifeng area, the main squid, and the group head, are suitable for hydroponic plants on the pond surface. These ponds have high levels of nitrogen and phosphorus in their bodies of water and serious water pollution. Hydroponic plants can effectively improve water quality. Rich nutrient elements are also conducive to the growth of hydroponic plants, which can increase the economic benefits of hydroponic plants. It is also suitable for hydroponic plants in the pond water where aquaculture, such as astragalus, loach, catfish, prawn and crab are cultured.

Reporter: The fishpond hydroponic plants can effectively purify the water quality and improve the ecological environment of the pond. However, what proportion of hydroponic plant cultivation area to pond water surface will not affect the normal growth of the fish?

Meson Lin: Hydroponics plant cultivation area accounts for about 5% of the pond water area on it. Experiments have shown that under the same conditions, hydroponic plants will not affect the dissolved oxygen content of the water, fish can grow normally.

Reporter: How to hydroponic plants on the surface of fish ponds?

Meson Lin: Take the bamboo-style hydroponic water spinach as an example. Use bamboo to form a rectangular frame of 1 meter and 0.5 meters in height. Place a net in the middle of the screen on the screen. Transfer the land-grown water-growing seedlings online. Connect the frame with a rope and fix it in the pond. On both sides. For example, other plants in hydroponic culture can adopt the foam box-type water culture method, that is, adding the matrix in the foam box, sowing the seeds of the plants in the matrix, and the box floating on the surface of the pond.

Reporter: What are the effects of the two kinds of hydroponic culture methods, bamboo raft and foam box, on plants?

Jie Zilin: Hydroponic plants can grow regardless of bamboo or foam boxes, but they have different effects. The effect of foam box hydroponic culture is better, because more parts of the roots of the plant grow in the matrix above the water surface of the pond. The matrix used has more appropriate bulk density, air permeability and “water uptake”, which can make the root of the plant Oxygen deficiency is less likely to help absorb nutrients in the water and ensure normal physiological activities such as photosynthesis.

Reporter: What should we pay attention to hydroponic plants on the surface of fish ponds?

Jie Zilin: First, it is not suitable for hydroponic plants in ponds that cultivate herbivorous fish. Second, the area of ​​hydroponic plants is appropriate to occupy about 5% of the surface of ponds. This can achieve the best results.

Reporter: What should be paid attention to in daily pond water quality management?

Meson Lin: The ponds for hydroponic plants are the same as the general ponds. During the entire production process, fresh water should always be maintained and the dissolved oxygen should be sufficient. The pond water level is generally controlled from 1 to 1.5 meters from March to April, and from 1.5 to 2.5 meters from May to October. The pond water quality is yellow green or oil blue, and the water body is 25 to 30 cm in transparency. If water quality is found to be aging or acidic, use lime water of 20-30 mg per liter to splash it all over, or use microorganisms such as EM bacteria to regulate water quality. Monthly use of microbial preparations or sediment improver 1 or 2 times to maintain good water quality.

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