Generally, crab ponds have 15 cm thick soft mud or silt, and it is better to use soft mud bottoms containing 90% mud and 10% sand. The depth of pool water is more than 1 meter, and the water temperature is generally maintained at 15 to 28°C, and the salinity is 10 to 30, pH 7.6 to 8.2. Before planting, the beach will be ploughed and ploughed.
After clearing the pond, 50 cm of new water was introduced, 50 kg of chicken manure and 10 kg of urea were applied per acre to make the pool water yellow-green or light brown.
Loach seedlings can be sown in late November to December, and later in March to April. The mud-based stocking area is controlled at 20% to 30% of the total area of ​​the crab pool. The culture area is on the beach or central beach near the intake to keep the water flowing. Generally, 0.75 kg (ie, 450 grains) seedlings are sown per square meter of 600 grains/kg. Water storage should be used to sow the seedlings, and the water level should be maintained at 20-30 cm. After long-distance transportation, the seedlings are in an oxygen-deficient and water-deficient state. After the beach is released, the humus in the bottom of the swifting pool can easily cause poisoning and death. Therefore, water should be injected to increase the survival rate.
When the seedlings enter the pool, the water level can be kept between 20 and 30 cm. In case of cold air southward, the water level should be raised to 60-70 cm. The water level of the Serratia marginalis should be raised to 1 to 1.2 meters after stocking. During cultivation, the water quality is adjusted according to the temperature, seawater salinity, etc., so that the ground water is changed frequently to keep the water fresh, so as to facilitate the rapid growth of blue crabs and loach.
Adhere to daily timing, fixed-point, qualitative, quantitative dosing, so that Serrata Crab eat, eat well, without residual baits. Feeding points try to avoid muddy stocking areas.
The large-scale propagation of large green algae, such as canola, in the pond will seriously affect the normal growth of loach. The depth of pool water should be maintained at 1 to 1.2 meters to suppress the growth of green algae. When it is found that the algae such as Enteromorpha are multiplying, they must be cleaned and removed regularly.
After about 7 months of breeding, the loach shell is as long as 2.5 cm or more and 200 grains per kilogram or less, that is, the product specifications. From the beginning of the winter to the following year, the Qingming is the harvest season of the loach, among which the most abundant from Xiaohan to Dahe, the blood is more delicious, and the temperature is low, it can be stored for a long time. The method of picking up muddy grass is simple: After the crabs have been harvested, drain the pool water and use the shovel to carry the mud into the sack and wash it.
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hydroponics system-nutrient technique (NFT)
NFT does not give average support to roots. Typically, the roots sit in a long sloping channel irrigation (Fig. 1.1). The nutrient is introduced into the high class of the canal and allowed to flow over the roots after which it drains into the nutrient tank. This is then re-pumped back into the channel to repeat the watering process.
This feed cycle can be intermittent or continuous. An & lsquo; The intermittent 'rss cycle is controlled by the clock and repeated several times per hour. this is sometimes called the "NFT pulse". The NFT pulse usually achieves better aeration of the roots as the roots are exposed to air between each feed. A & lsquo; continuous' rss cycle works non-stop. This is often used in commercial operations.
You can easily grow your favorite flowers at home without muddy mess and need to water your plants regularly.
Hydroponics is an ideal way to grow plants in urban areas. This makes it a great hobby that helps you to relax and it is fun to watch the hydroponic plants grow in the garden nft.
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