The use of chemical fertilizers in fishponds is the use of algal organisms in the nutrient-cultivated waters of fertilizers to provide a rich diet for filter-feeding fish such as cockroaches and cockroaches. The increase of the water temperature from June to September each year is the golden season for fish growth. The consumption of nitrogen in the water area is large. At this time, using chemical fertilizer as top dressing can prevent the deterioration of water quality without consuming oxygen in the water. The water color is grass. Green, can create a good ecological condition for fish, reduce the occurrence of fish diseases, can greatly increase fish production, generally 4 kg per 667 square meters (1 acre) fish ponds (ammonium bicarbonate, calcium magnesium phosphate each 40 %, Potassium chloride 20%), Cod and salmon can gain 1 kg. The cost of chemical fertilizer is about 2.5 yuan, and the output value of fresh fish is about 5 yuan. The input-output ratio is 1:2, and the economic benefit is considerable. Now the main technical introduction of fish farming fertilizer is as follows.
1. Timely application of appropriate chemical fertilizer: From June to July and from September to October, the water temperature should be between 20 and 30°C. It is better to apply fertilizer on a sunny day from 8 to 10 am. The effect of fertilization on rainy days is poor and should not be carried out. Application of fertilizers should be based on water quality, with less water and fertilizer, and more water lean. In the fertilization to take a small number of multiple methods, one application can not be excessive, generally 7.5 kilograms per 667 square meters of the first application of chemical fertilizers, after a week after the application of 1 time, 4 kg each time fertilization. In the early stage, ammonium bicarbonate, calcium magnesium phosphate and phosphorus were used, and the ratio was half. The later application of ammonium bicarbonate, calcium magnesium phosphate, potassium chloride, the ratio of 4:4:20 If the pH value exceeds 7.5, the transparency of the water is less than 40 cm, then stop applying nitrogen fertilizer, so as not to cause fish poisoning.
2, chemical fertilizer method: fertilization, the first fertilizer into the barrel with water-soluble stirring after spilling the whole pool. The first application of phosphate fertilizer, followed by nitrogen fertilizer, phosphorus, nitrogen can not be applied simultaneously, the order can not be reversed. If carried out at the same time, toxic and non-fertilized metaphosphoric acid will be produced. It should be noted that when applying nitrogen fertilizer, it cannot be mixed with quicklime, plant ash or other alkaline fertilizers to avoid reducing fertilizer efficiency. In addition, it is not possible to directly apply solid fertilizer to the water. Otherwise, the effect is not only poor, but fish are prone to eating poisoning.
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