Fish pond fertilization in spring
The role of fertilization in fish ponds is mainly the reproduction of plankton, epiphytic algae, zoobenthos, and other natural foods, providing abundant food resources for eel, oyster and other farmed fish. Fish pond fertilization in spring should pay attention to the following matters:
Organic fertilizers must be fully fermented. The temperature of fish ponds in spring is low, and the water is rich in oxygen. Reasonable application of organic fertilizers not only has low cost, but also can achieve good breeding results. The use of organic fertilizers such as large excrement and livestock manure in fish ponds must be fully fermented, because fertilizers that have been fermented and decomposed and organic matter is fully decomposed and applied to fish ponds can reduce oxygen consumption in the water and can be quickly absorbed and utilized by phytoplankton. It also kills pathogens in organic fertilizers.
Less application, uniform application, and so on, so-called less application, that is, every 667 square meters of organic fertilizer for each application of tens of kilograms to 100 kilograms; the so-called uniform application, that is, the water and the entire pool of manure spatter evenly, so that the fish pond water color was brown Or the oil is green, the surface of the water is oil-free, and the transparency is kept between 20 cm and 30 cm. The so-called diligence, that is, with the feeding of the fish, the fertilization immediately when the pond's water content decreases and the transparency is greater than 30 cm.
The amount of fertilization should not be determined by the fish system. It is not the fish pond of the main eel and carp. Since the feed is fed, the amount of fertilization in the spring should be reduced accordingly, so that the transparency can be kept between 30 cm and 40 cm. With the increase of temperature, the pond water fertility will increase. getting bigger. Intensive breeding of fish and ponds with high yields of carp and grass carp are not suitable for fertilizing even if they are mixed with some carp and carp.
Fertilization time is good for sunny mornings. Listen to (watch) the weather forecast. Do not fertilize on cloudy or rainy days. Phytoplankton grows through photosynthesis and fertilizes in the sunny morning of 2-3 consecutive days. It can promote the proliferation of microorganisms as quickly as possible, minimize the pollution of organic fertilizers on water quality, and ensure the benign circulation of fish and pond materials. .
Changing the water regularly to keep the water fresh If the accumulation of metabolic wastes of organic matter and various types of organisms in fish ponds is excessive, the oxygen content in water decreases, and plankton composition is poor, the growth of farmed fish will be affected. Therefore, it is necessary to change the new water regularly so as not to overload the fish ponds and keep the water quality “fat, live, tender and coolâ€.
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