River crab farmers clear the pond for better breeding next year, do not use pond cleaning medicine indiscriminately
A lot of small pond mouth crab sell almost, facing clear pond, how to correct clear pond, master good method, for the next year's breeding buried foreshadowing, crucial! Questions? In the whole Xinghua area, 1000 crabs/mu are generally bred. Why only about 500 crabs are taken after maturity? Many farmers wonder that they have never seen dead crabs in the whole breeding process. Where have the remaining 500 crabs gone? This is worth exploring! Residual cause? Is the seedling time wrong? Is the planting time and method wrong? Why is production so low? So today we're going to talk about how to avoid residue in the pond! Add updates on when to plant grass and when to put seedlings, please pay attention. Common Clear Pond Drugs
1: pyrethroid: the most used varieties in the market, vial packaging points (deltamethrin, fenpropathrin, cypermethrin) are not worth recommending to everyone, this thing will definitely affect the survival rate of the second year! I don't mean it.
2: trichlorfon: Tangkou with ring claw disease, some people will choose to use, but everyone has a misunderstanding, saying that lime cannot be used after trichlorfon is used up, this is wrong,
1. Dichlorfon and lime at the same time will generate dichlorvos, remember that at the same time, not at the same time, every week will not be a problem
2. Dichlorvos is very unstable in water and is easily hydrolyzed. Therefore, there is no residue. You can rest assured that
3: bleaching powder (chlorine preparation, strong sterilization effect, no residue, 50 jin per mu)
4: Saponin, fibraurea, tea seed cake (kill fish but not shrimp and crab)
5: quicklime, farmers directly under 100 catties of lime per mu, no other drugs
Clear pond has skills
1: Tangkou lobster: use pyrethroid to fill holes and block them. Remember that soaking in large water surface will affect the survival rate of seedlings in the coming year.
2: ring ditch silt-quicklime ring ditch hardened soil 3: pond mouth ring claw (trichlorfon + rotenone)
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