1. Inorganic Fertilizers Inorganic fertilizers are also called chemical fertilizers, commonly known as chemical fertilizers. After the application of general inorganic fertilizer fertilizer effect is faster. It is called quick-acting fertilizer. Inorganic fertilizers can be divided into nitrogen fertilizers, phosphate fertilizers, potash fertilizers, and calcium fertilizers, depending on the ingredients contained. 2. Organic Fertilizer The organic fertilizer contains a full range of nutrients, not only contains nitrogen, phosphorus, potassium, but also other various elements, so the effect of fertilizer is better. Slow application and decomposition, long-lasting fertilizer effect, also known as delayed fertilizer. Mainly green manure, manure, mixed compost and so on. 3, dissolved oxygen in the pool of water dissolved in the pool of oxygen is called dissolved oxygen. There are two major sources of dissolved oxygen in the pool water: one is dissolved in the air; the other is the change in the photosynthesis of the phytoplankton in the water or a change in the water's contents (such as the addition of oxygenating agents) to the water. Dissolved oxygen mainly has the following variations: (1) Diurnal variation. Oxygen content is high during the day, and the amount of dissolved oxygen in the water is often oversaturated during the afternoon of 2-4 hours. The amount of dissolved oxygen is low at night, and it is reduced to the minimum value before dawn. At this time, it is often necessary to turn on oxygen. (2) Vertical change. Generally during the day, the upper layer of dissolved oxygen is much higher than the lower layer of dissolved oxygen. At night, due to the convection of the pool water, the difference between the upper and lower layers of dissolved oxygen is gradually reduced, and the oxygen difference is greatest in the afternoon of the whole day. At this time, oxygenation of the bottom water should be performed. (3) Changes in level. In general, due to the effect of wind, dissolved oxygen is higher in the daytime than in the upper wind, but the dissolved oxygen level in the morning changes in the opposite direction. It is the dissolved oxygen in the upper wind is higher than the lower wind. Therefore, when the fish begin to float in the early morning, they generally tend to have a windward surface. (4) Seasonal changes. Generally, low dissolved oxygen content mostly occurs in summer and autumn seasons, especially in summer and autumn, with low dissolved oxygen. At this time, oxygenation work must be done well.
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