Fertilization is one of the key measures to seize the high yield of fish farming. Therefore, the majority of farmers should apply fertilizers scientifically and rationally according to different farming environments in paddy fields, ponds, and reservoirs to ensure that fish production increases. First, the fertilization of paddy fields in paddy fields must take into account the symbiotic characteristics of rice and fish. The basic fertilizer is mainly applied to manure, but the quality of manure is low, especially nitrogen is far from meeting the minimum requirements for stable yield and high yield of rice. Fertilizer is indispensable for rice topdressing, and it is also an effective way to seize the high yield of fish farming. Rice field fish fertilizer application should be timely and appropriate, to master the principle of less quantity. Each application of urea per acre does not exceed 7 kilograms, and superphosphate does not exceed 10 kilograms. Ammonium bicarbonate is the best nitrogen fertilizer that is the cheapest, effective, and high in conversion rate, but because of its large ammonium nitrogen irritation and toxicity, if If you do not master it, it will cause damage, so it is best not to apply it. Second, pond fertilization Newly built fish ponds or thin water fish ponds must first apply fertilizer, green manure and other organic fertilizers to cultivate water quality, generally fertilizer applied to the bottom of the pool surface edge, the sun exposure, decomposition of the fermentation and then injection of fish. At the same time, according to the changes in temperature and water quality, we must grasp the principles of timely, uniform, and small quantity multiple times; use chemical fertilizers as top dressings to keep the pool water “fat, live, tender, and coolâ€. Transparency should be 25 to 35 cm. Generally every 7 to 10 days fertilize once, apply urea 1.5 to 2 kilograms per acre, superphosphate 5 kilograms. The method is to first dissolve the fertilizer into water, and then apply nitrogen fertilizer to the whole pool evenly after the first phosphorus fertilizer, and the time interval is preferably more than one day. Third, the reservoir fertilization reservoir due to large water surface, farmyard manure generally can not meet the needs of fish intake, must be based on chemical fertilizers, because of its quick, low cost, input-output ratio of about 1:2 or so. The fertilization of reservoirs must be preceded by the application of phosphate fertilizer followed by the application of ammonia fertilizer. The order cannot be reversed, nor can it be carried out simultaneously to prevent the production of toxic partial metaphosphates without fertilizer effects. It is also not possible to apply granular or powdery raw fertilizers to prevent fish from eating poisoned by mistake. However, after the solution is dissolved and diluted, the surface of the water with good lighting conditions is sprayed evenly with a sprayer. The fertilization was stopped when a large amount of flooding occurred during the storm, and spillway inlets were also not suitable for fertilization (normal weather). The time and quantity of fertilization are closely related to the water temperature, and the light is good. When the water temperature is above 20°C, the phytoplankton grows fast and is fully utilized within 7 to 10 days after fertilization. Therefore, the fertilizer should be applied every 7 to 10 days from June to September. Choose from 8 to 10 o'clock in sunny morning, it is not suitable for rainy days, and it should be applied every 10 to 15 days before June and from late September to October. The time and application amount should be determined according to the water quality and water temperature. 3 ~ 3.5 kg is appropriate, transparency is maintained more than 40 cm. The fertilization of reservoirs can promote the growth of phytoplankton and provide enough feed for earthworms and catfishes. Similar to fertilizing crops, nitrogen, phosphorus, and potassium must be appropriately matched, and the fish and water quality should be slightly different. Nitrogen fertilizer is mainly composed of urea, ammonium sulfide, ammonium nitrate and ammonium bicarbonate. Among them, urea has the highest nitrogen content, while ammonium bicarbonate is the cheapest, and has quick results, high utilization rate and good results. In the early stage of cultivation, the amount of potassium in the water body is large. Only ammonia and phosphate fertilizers can be applied. The application ratio of urea and superphosphate is 1:2. If ammonium bicarbonate is used, the ratio of superphosphate to calcium superphosphate should be 2:1. A certain percentage of potash should be applied. The percentage of ammonium bicarbonate, superphosphate and potassium chloride is 70:22:8.
Tattoo Kits
Fake Tattoo Kit,Tattoo Machine Kit,Tattoo Kit
Zhongyu Mechanical Equipment Firm , http://www.ywtattoogoods.com