I. Use of Organic Fertilizers and Matters Arising out of Attention Organic fertilizers include green manure, manure, manure, compost, wastewater from certain factories, and domestic sewage. This is the most widely used, most effective, and best-performing fertilizer for fish farming in China: organic fertilizers have a comprehensive composition and a relatively slow and lasting fertilizer effect. Therefore, the long-term effect of using organic fertilizers has a higher production effect. Say the same pond, the application of organic fertilizer production is often higher than the application of inorganic fertilizer. However, organic fertilizers also have some common disadvantages. The most serious of these is due to decomposition in the pond, which increases the content of various organic matter in the pool water and consumes a lot of oxygen, which can cause certain pollution of the pond. In view of the above disadvantages, various manures, especially those that decompose quickly and have a large consumption of oxygen, are preferably used after preliminary fermentation and decomposing, which can not only reduce the pollution of the pond, but also can quickly exert the fertilizer effect. Silkworm feces decomposes quickly, and contains more uric acid salts, which are highly toxic to fish and need to be decomposed through fermentation before use. Both manure and compost have undergone preliminary fermentation, so the pollution level is lighter and the fertilizer efficiency is faster. It can be used directly. When using green manure and unfermented manure, it is necessary to properly grasp the amount of each time, that is, to achieve the purpose of fertilizer and water, and to prevent excessive pollution. Organic wastewater from food processing plants, dairy farms, and other cities, and domestic sewage from cities may be used for fish farming. However, some of these sewage or waste water also contain a small amount of toxic substances, so they should be investigated before use and during use or analyzed directly. Second, the amount of organic fertilizer and usage 1, manure, manure and compost with this type of fertilizer base fertilizer, the amount is generally 400 --- 500 kg per mu (refers to the general semi-dry livestock manure and compost, human feces With chicken manure halved; the following are the same), depending on the depth of the pond, fertilizer quality and the original fat and increase or decrease. If discharged just in the clear pond, the fertilizer can be evenly spread in shallow water in the pond (with water or less water), so that it is exposed to sunlight, the water temperature rises, and the decomposition mineralization is faster; 3- - Fill the water after 4 days and put the fish every 7-8 days. If the base fertilizer is used when the pond is full of water, the fertilizer can be divided into small heaps 10-15 days before the fish is released, distributed in the shallow water of the sunny area, gradually decomposing and mineralizing, and spreading the water. If the water temperature is already high at that time, it can be mixed with water evenly on the surface of the pond five-seven days before; the compost is better and is usually sprinkling. The amount of topdressing fertilizer should be different depending on the method of fish farming, fertilizer quality, pond conditions and water temperature: According to practical experience, the amount of topdressing fertilizer is generally: from April to June, 300-400 kg per mu of water surface per month; 7 - In September, due to the large amount of feed material, the water quality was already very fat, and it was generally no longer top-dressing; after mid-September, the weather turned cooler and the water quality became lighter, and it was possible to top-dress fertilizers, generally about 200-250 kg per mu. The topdressing method can be divided into small piles and piled up every 7-10 days, so each time you use the full monthly fixed amount of 1/4--1/3; you can also use the spill method, every 1--2 Sprinkle once a day, so each dose is 1/30--1/15 of the full monthly quota. For ponds with large areas, you can use a frame or hanging bag to fertilize. 2. For green manure, green manure should be used to dry the raw materials (green grass, leaves, crops, green stems and leaves, etc.) to semi-dry, and then a certain amount of manure is added, piled up in the shallow water at the shore or on the pool corner and pressed with stones. Or mud so that it sinks into the water; thereafter, every three to five days flip once, so that decomposition of corruption, the liquid gradually spread in the pool. Summer and fall can generally be decomposed after 7-10 days. It is possible to remove the coarse and hardy rhizomes from the pond and add a new batch of new materials. The application rate of the base fertilizer is approximately 200--250 kg per mu, and the amount of 100-150 kg per top dressing is applied later. In the summer and autumn, when the green manure is applied in high temperature season, due to rapid decomposition and serious pollution of water quality, if a large amount is used, it is easy to cause flooding pools. It is necessary to increase vigilance. If the pond is large, the green manure may also be used for racking and hanging bags. . 3. The amount of waste water and sewage waste water and domestic sewage is larger due to the different concentration of waste water or sewage. When domestic sewage is used, the amount of base fertilizer accounts for approximately 1/10---1/4 of the pool water. Put the fish 7-8 days after fertilization, and then start fertilizing again every 3 to 4 days. When applying topdressing, ponds that do not feed are chased every 3-4 days during the peak season of fish growth (July-September). Each use is about 1% to about 1.5% of the pool water, and the spring and autumn rainy season is roughly applied once every half month. Each time, the amount of water added is about 3% to 4%.
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