CATDOLL : CATDOLL: How to cultivate Channa bream seedlings? How to cultivate Channa bream seedlings?

1. How to cultivate Channa bream seedlings? How to cultivate Channa bream seedlings?

Hello, the seven-star fish you mentioned is actually called moonfish. It grows relatively slowly. Generally, the seedlings bred in the spring will not reach a weight of 150 grams until the end of the year (about 9 months). It can be seen that its growth rate is very slow. It takes at least one and a half years to grow to half a catty. If you want to breed moonfish on a large scale, I suggest you use Yubao Aquatic Products' special EM bacterial liquid, which is a microbial beneficial bacterial liquid for aquaculture. One of the advantages of EM bacterial liquid is that it shortens the breeding cycle of aquatic animals. If it is used in moonfish breeding, it can exceed half a catty at least three times in advance, because Yubao EM bacterial liquid can promote intestinal absorption of aquatic fish, allowing the fish group to grow faster, and is less susceptible to diseases, thereby increasing the survival rate. Now many aquaculture farmers are using Yubao EM bacterial liquid for aquaculture, which is very effective and quick to show results.

2. How to cultivate tomato seedlings?

1. Control the temperature

When the temperature is right, it usually takes more than 30 days to grow tomato seedlings. However, in winter, the temperature is relatively low and there is less sunlight. It takes about 50 days from sowing to growing four leaves and one heart. Farmers should determine when to grow seedlings based on their own transplanting time, and the seedlings should not be too vigorous.

When raising seedlings in winter, there will be continuous haze weather. Observe the temperature in the greenhouse more often. When raising tomato seedlings, the temperature at night should not be lower than 10℃, and the temperature during the day should not be lower than 20℃. When the temperature is too low, find ways to increase the temperature, such as setting up a second film, laying ground temperature lines, and other warming methods. When there is little light, turn on the supplementary light in time.

2. Disease prevention and control

Many greenhouses will encounter such a situation: the temperature is maintained during cloudy days, but the humidity rises. The outside of the greenhouse is foggy, and the second film is built inside, so the moisture cannot be discharged, which is easy to cause diseases. Among them, damping-off and damping-off are both high-humidity diseases, which have a great impact on the growth of tomato seedlings.

Prevention should be done before the disease occurs, and it can be sprayed together with foliar fertilizer. Fludioxonil and metalaxyl are commonly used for disease prevention and control. For 30 catties of water, 5 ml of fludioxonil and 15 ml of metalaxyl are used. Each spraying should be done at intervals of about ten days. It can also be done together with fertilization, such as mixing with urea, potassium dihydrogen phosphate, boron and other fertilizers.

3. Experience in planting and cultivating bayberry seedlings?

1. Nursery selection: The bayberry nursery should be located in a location with convenient transportation and flat terrain. If it is a slope, the slope should not exceed 5°. The slope should face north or northeast as much as possible. The soil should be fertile, loose, and sandy loam with a deep soil layer.

2. Seed collection: Bayberry seeds should be collected from mature fruits of healthy adult trees. The fruits should be spread out and piled up in a place without direct sunlight. After 4 to 5 days of piling, the flesh will rot and then rinse and remove the floating shriveled fruits, dry the surface and set aside for use.

3. Land preparation and fertilization: Before sowing bayberry, the land should be prepared and deeply plowed, and then dried in the sun. Apply 3000-5000 kg of pig or cattle manure or compost, 15-20 kg of superphosphate, and some wood ash per mu. Dig deep drainage ditches around paddy fields, and pay attention to drought and flood prevention in mountainous areas.

4. Sowing method: Before sowing bayberry, soak the seeds in 0.1% potassium permanganate solution or 800 times of 40% methyl thiophanate solution for 10 minutes, spread the seeds evenly on the bed surface, and after sowing, press the seeds gently into the soil with a wooden board, cover them with a layer of fine soil and then a thin layer of grass.

5. Management during the seedling stage: Bayberry is generally sown in mid-to-late October. The seeds germinate in January of the second year and emerge in mid-February. After emergence, attention should be paid to the control of temperature and humidity. At the same time, attention should be paid to prevent sunburn or sudden wilt. It can usually be transplanted in late July.

4. How to cultivate yellow catfish fry?

Artificially hatched yellow catfish fertilized eggs are oblate, light yellow, with transparent egg membranes and an egg diameter of about 2 mm. First, use yellow mud water to debond the fertilized eggs. The specific method is: put 200,000-300,000 fertilized eggs into a basin with 4-5 kg ​​of yellow mud, stir the yellow mud constantly with your hands, and gently pour the artificially fertilized eggs into the yellow mud. After 5-6 minutes, place the debonded eggs in an incubation tank or incubation loop for running water incubation. 400,000-600,000 eggs can be placed in each cubic meter of water. The wall of the incubation pool should be kept smooth, the water quality should be fresh, and the water flow speed should be enough to ensure that the fertilized eggs can be turned evenly. The dissolved oxygen in the water should be above 5 mg/L, and the filter screen should be washed frequently. After 4-5 days of incubation, the membrane can be removed to form fry with a body length of about 4 mm.

5. How to cultivate California bass fry in cement ponds?

Answer: The area of ​​the cement pool should be 50 to 100 square meters, the water depth should be 0.8 to 1 meter, the water quality should be good, the transparency should be 40 cm, and the dissolved oxygen should be above 4 mg/L.

The water inlet is filtered with a 50-60 mesh cloth to prevent harmful organisms from entering the pond and the fry from escaping. 200-250 fry are released per cubic meter of water, depending on the drainage and irrigation conditions and the size of the fry.

In a breeding pond with sufficient water source, good water quality and conditions for frequent water filling, about 300 fry under 2 cm in length, 200-300 fry of 2-3 cm, and 100-200 fry of 3-4 cm can be stocked per square meter of water surface. Those that cannot be replaced with water should be released appropriately.

6. What are the techniques for breeding spotted forktail fry?

The seedling technology of spotted fork is to plant it in the soil, water it and fertilize it.

7. Is it better to buy onion seedlings or cultivate seeds?

Sowing green onions with seeds is definitely more troublesome than buying seedlings directly to sow green onions. There are two main steps, one is to accelerate germination, and the other is sowing. Let's talk about germination first. The soil must be prepared before planting vegetables, and green onions are no exception. They are suitable for sowing on relatively flat terrain. Because green onions consume a lot of water, when sowing on the selected land, you must consider whether watering is convenient. Then, base fertilizer should be applied. 40 kg of compound fertilizer should be used as base fertilizer to fertilize one acre of land. In this way, the onion seeds can be helped to germinate in the later stage. The seedlings need a lot of fertilizer in the early stage, so the base fertilizer is very critical.

We must pay attention when choosing green onion seeds. There are many kinds of green onion seeds. Some green onions have more white onions and taste sweeter. There are also some green onions that taste spicy. Choosing green onions for planting should be based on the local market and local climate and soil conditions to choose high-yield green onion seeds. Good green onion varieties usually have more white onions and good stability, and the key is strong cold resistance.

After buying the seeds, don't rush to sow them. It's not difficult to speed up the germination of the seeds. Soak the seeds in cold water for half a day, then wrap them in wet cotton cloth. Put the seeds in warm water for half an hour. Use a small spray bottle to spray some water every day to keep the seeds moist. The seeds can be sown after a week.

If the green onion is planted directly with seeds, there are relatively strict requirements for the sowing time. Generally speaking, it is best to sow around the Mid-Autumn Festival. If sown at other times, the green onion is prone to reduced yield and weak seedlings, especially if sown too late. In the cold weather in winter, the seedlings are not strong enough and are easily frozen to death and frostbite.

Buying green onion seedlings for sowing is actually the same as planting after germination. After planting, water once a week. Always pay attention to the weather forecast. When it rains, drainage measures should be taken in advance. The roots of green onion plants cannot be soaked in acidic rainwater for too long, because the roots are prone to rot.

After autumn, when there is the first frost, you should pay attention to reducing the number of watering. Water absorbs heat, and the first frost will form a lot of water vapor. You should pay attention to keeping the roots of green onions warm, and you should apply nitrogen fertilizer to protect the roots of green onions from frostbite. Green onions need to be fertilized four times from seedling to vigorous period, and the soil should be cultivated after each fertilization, so that the loose soil can promote root growth and ensure the quality of green onions.

8. What are the water quality requirements for catfish fry cultivation?

During the winter in a small pond, due to the high density of fish and a lot of excrement, the water quality can easily deteriorate, affecting the normal life activities of catfish.

Therefore, during the entire wintering period, sewage should be discharged every 2-3 days to remove leftover bait and feces; new water should be added every 3-4 days to keep the water fresh, oxygen-rich, and pH 7-8.5. The water quality of large-scale wintering pools should be better, and new water can be added appropriately according to the water quality.

In addition, the pond water should not be too fertile during the winter, especially in natural wintering ponds. The transparency of the pond water should not be less than 35 cm to prevent the fish from frostbite due to lack of oxygen and floating to the surface to breathe.

9. How to feed eel seedlings during cultivation?

When feeding young eels, mix cooked egg yolk and soybean milk into a paste and spread it at the beginning of the feeding stage. Then gradually feed water fleas, silk earthworms, fly maggots, chopped earthworms, river clam meat, etc. Some people also believe that the best feed for eel fry is silk earthworms, followed by fly maggots. Young eels fed in this way grow strong. During the feeding process, animal bait is the main feed, but a certain proportion of plant bait should also be added continuously. Especially in the later stage of feeding, it is necessary to add a certain amount of bran, bean cake and dregs. In addition, new water should be injected frequently to prevent the parent eel from being infected by bacteria. Stop feeding for one day before spawning. Classification of young eels After careful feeding, eel fry can grow into eel species weighing more than 20 grams in the same year. When the young eels are 3-4 cm tall, they should be cultured in separate ponds. The cleaning method of the eel pond is the same as that of the eel fry pond mentioned above. They are stocked at the end of March and the beginning of April every year, and the density depends on the breeding conditions. The stocking quantity is 80-160 (1-2 kg) per square meter. They must be strong, without any injuries on the body surface, and of uniform size. Before stocking, the eel fry should be disinfected with 3%-5% salt. The feeding method of young eels is the same as that of adult eels.

10. Poplar seedling cultivation method. What experience do you have in planting Nanlin 895 fast-growing poplar seedlings?

There are generally many methods for cultivating poplar seedlings on the Internet, but first you have to choose good fast-growing poplar seedlings with strong adaptability and suitable for the local area. The Nanlin 895 you mentioned is generally suitable for growing in the middle and lower reaches of the Yangtze River and the plains south of the Yellow River. A 25-acre nursery generally requires 60,000 to 80,000 seed cuttings. Experience needs to be accumulated slowly, mainly irrigation and field weeding. It is not advisable to use herbicides. Wait until the seedlings grow up before applying fertilizer.

Generally, Nanlin 895 south of the Yellow River has a strong adaptability and grows fast. In the Huanghuai area and the middle and lower reaches of the Yangtze River, you can choose Nanlin 95 and 895 poplar seedlings that are cultivated with superior technology in Guannan. The seed strips are introduced from Nanjing Forestry University.

But the disadvantage is that it requires sufficient water source.