Crabs are grown by shelling. Each time the shell is removed, its weight increases by about 30%. To make the crab shelling, shelling, and rapid growth, we must seize the following aspects:
First, carefully selected:
When we go directly to the pond to see the goods during the purchase, the approach is of course good, but it is also unsatisfactory. The difference between having a greenhouse and a land cultivation is the same as that of the same people. As for farmers who do not understand the technology, there are also many people who buy human breeds as natural breeds, and the price difference between the two is one time.
Where the first lateral tooth exceeds the eyelid is the authentic Yangtze variety, the lower eyelid is the non-Yangtze variety. In addition, the breed has one age and two age points, and the same size and size of the first and second ages are mixed together, which often makes the purchasers fool. The first-year nature is immature, and the shelling can continue to grow. The second-instar is mature and cannot be successfully shelled.
Second, adjust the water quality:
Water is the first element of raising crabs. Water quality is fat, thin and old. The fertilizer is yellow-brown or light green, with a transparency of about 30 centimeters, and the water color changes within 24 hours. "Early Red Night Green" is a change in water quality; thin water is light green, the transparency is more than 40 cm, and there is no change in day and night; the old water is copper-green, the transparency is about 35 cm, and there is no change in day and night. The water quality of crabs is mainly lean and the PH value is in the range of 7.5-8.5. The general pond water quality PH is about 6.5, which will need to be adjusted. Lime pellets 10-20 kg/mu, adjusted once every two weeks; when water quality is too thin, it is also necessary to chase fertilization materials, use organic fertilizer 20-100 kg per acre or inorganic nitrogen fertilizer 1-2 kg, and match inorganic phosphate fertilizer 1 - 2 kg/mu. For ponds that raise years of crabs or fish, there is generally no shortage of nitrogen fertilizer. Inorganic phosphate fertilizer can be applied alone to 1.5-2 kg/mu, applied once every half-month.
When the water quality is aging (water), it is necessary to timely drain 1/3 of the original pond water, and then add the same amount of fresh water to adjust. When the water quality is relatively rich, the original pond water is discharged 1/3-1/4 and the same amount of fresh water is injected.
Third, strengthen feeding:
Making crabs is different from raising crabs. The latter can not control the intake of food for preventing premature feeding. The former must be given full food, eat well, grow up quickly, shell out, and then grow until sexual maturity. And the bigger the specification, the higher the price. Therefore, during the entire rearing period, even before and after shelling, more nutrients need to be given, and the proportion of animal feed should be increased as much as possible so as to achieve simultaneous shelling and reduce mutual killing. Conditional feedable full-price compound feed.
In addition to animal feed, natural plant feeds should not be less. There should be submerged plants on the bottom and floating plants on the surface
Roller Hook Tomato Plant Support
Roller Hook Tomato Plant Support,Tomato Trellis-trellising,Greenhouse Tomato Plant,Accessory Trellising Roller Hook
JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.alibabagreenhouse.com