How to apply fertilizer reasonably in fish ponds? How to apply nitrogen fertilizer in fish and rice fields?

Fertilization in fish ponds is one of the main techniques for regulating the aquatic environment of ponds and cultivating biological baits for fish. If the water quality is too thin, the fish will almost have a big head, a small tail, a thin back and less meat; using too much fertilizer will make the water quality worse, not only affect the growth of fish, but even cause a large number of fish to die. Therefore, reasonable fertilization in fish ponds should pay attention to the following points:

① determines the amount of fertilizer application according to the fertilizer degree of pond water.

It is generally believed that the normal transparency of pool water should be 25cm to 30cm, and the water quality should be tea brown, green brown, yellow brown and oil cyan. If the transparency is too large, the water quality is too light, which indicates that the water quality is thin, and the amount and times of fertilizer application should be increased.

② fertilizer needs to be dissolved in water first.

Chemical fertilizer has the characteristics of fast fertilizer effect and short duration, so it is often used as topdressing in high temperature season, generally dissolving with water before sprinkling, if directly applied, fish will cause poisoning and death after eating chemical fertilizer particles by mistake. Generally, topdressing is done twice a month, using 5 kilograms every 667 meters.

③ organic fertilizer needs to be fully fermented

Unfermented organic fertilizer, due to many pathogenic organisms, will cause fish disease, but also because of the high oxygen consumption during the decomposition of organic matter, it is easy to cause anoxia and death of fish in fish ponds.

The proportion of ④ fertilizer should be reasonable.

Fertilization in fish ponds should be reasonably supplemented according to the lack of various nutrients in water quality. For example, if the water quality of some fish ponds is thin, organic fertilizer should be applied when fertilizing. the ratio of manure and chemical fertilizer is 4:1. Sprinkle the mixture after the water respectively.

⑤ fertilizes reasonably according to the weather and fish activity.

Give little or no when it is muggy or rainy; it is best not to give when the fish is not eating well or sick, so as not to cause dead fish.

PS: how to apply nitrogen fertilizer in fish and rice fields?

It is called "rice field fish culture" to raise fish at the same time during rice planting in rice field. The rational application of nitrogen fertilizer in fish paddy field has a good effect not only on rice, but also on the growth of fish. It is very important to select a suitable variety of nitrogen fertilizer for the application of nitrogen fertilizer in fish culture rice field. Ammonium bicarbonate in chemical fertilizer is toxic to fish to a certain extent, so it is best to use it as base fertilizer and release fish seed a week after application. Nitrogen fertilizer as topdressing, it is generally appropriate to choose urea and ammonium sulfate, urea 7.5kg / m ~ 2 per 66 / m ~ 2, ammonium sulfate should be doubled. If ammonium bicarbonate is needed, a small amount of ammonium bicarbonate should be used repeatedly. When topdressing, you should first put shallow field water, drive the fish to fish ditches or fish pits, and then deepen the field water after fertilization, which has no effect on the fish. In addition, topdressing barnyard manure can not only be used as fish bait, but also provide a good fertilizer source for rice, which can be said to kill two birds with one stone.