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Detailed Explanation of Key Technical Points for Broodstock Cultivation of Little Yellow Croaker
The little yellow croaker (Pseudosciaena polyactis Bleeker) belongs to the order Perciformes, suborder Percoidei, family Sciaenidae, genus Larimichthys (yellow croakers). It is distributed in the Bohai Sea, the Yellow Sea and the northern East China Sea. It is a warm-temperate demersal fish and was formerly one of the four major marine economic fish species in China. Since the 1950s, the little yellow croaker resource has declined severely. In this article, the author introduces broodstock cultivation techniques for the little yellow croaker. Through observation of the growth process of the little yellow croaker, growth parameters were recorded, laying the preliminary groundwork for artificial breeding and artificial farming of the little yellow croaker.
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Prevention and Treatment Methods and Technical Key Points for Rumen Atony in Cattle
Rumen atony is a disease in which the excitability of the rumen nerves is reduced and contractility is weakened, so feed cannot be normally digested and moved backward in the forestomach, resulting in fermentation and putrefaction that produce toxic substances, causing digestive disorders and systemic functional disturbances. 1. Etiology. It is mainly caused by excessive concentrate and insufficient roughage; a single feed type or excessive feeding of roughage rich in crude fiber and difficult to digest, such as straw, old dried hay, and bran; long-term excessive feeding of grass meal, boiled mushy root tubers, and dregs feed, which weakens rumination function
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Prevention and Treatment Methods and Technical Key Points for Winter Dysentery in Cattle
1. Prevention. The transmission route of this disease is infection through the digestive tract; therefore, cattle kept indoors in winter should have improved feeding management and environmental disinfection. Sick animals should be isolated and treated promptly, and the equipment and secretions of sick animals should be thoroughly disinfected. Manure must be strictly prevented from contaminating feed and drinking water, and manure management and harmless treatment should be strengthened. 2. Treatment. This disease is mainly treated with symptomatic therapy. An equal-volume mixture of turpentine oil and creolin can be given orally, 25-50 milliliters each time, twice daily. For severely affected animals, fluid replacement should be given promptly, such as 2000-3000
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Technical key points for feeding pigs with bitter lettuce in summer and autumn
Bitter lettuce, commonly known as bitter vegetable, grows vigorously in summer and autumn, has strong adaptability, high yield, and rich nutrition, and is a good feed for pigs. Fresh bitter lettuce contains 89% moisture, 2.6% crude protein, 1.7% crude fat, 1.6% crude fiber, and 3.2% nitrogen-free extract. Air-dried bitter lettuce contains more than 20% crude protein. Fresh bitter lettuce is tender and juicy, with white sap and a slight bitter taste, and has the effect of strengthening the stomach and promoting intestinal peristalsis. Therefore, it is good to feed pigs more bitter lettuce in summer and autumn. The feeding method is: the collected bitter lettuce
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Prevention and Control Methods and Technical Key Points for Chronic Respiratory Disease in Chickens
1. Improve the rearing environment, pay attention to insulation, prevent overcrowding, and maintain air circulation inside the coop. 2. Practice all-in/all-out management and regularly carry out spray disinfection of the chickens' bodies. 3. Trial use of vaccines for prevention: broiler chickens can be vaccinated with attenuated mycoplasma vaccine, and breeding chickens can be vaccinated with oil-emulsion inactivated mycoplasma vaccine, with one vaccination at 10 days of age and one before the start of laying. 4. Drug prevention and control. Planned administration of medication for prevention and control is still the key to controlling this disease at present, among which prevention is the most important. If treatment is only carried out after the disease has already occurred and spread or become severe, the results will not be ideal.
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Comprehensive Prevention and Treatment Methods and Technical Points for Iron Deficiency in Pigs
Preventive measures: Strengthen the feeding management of lactating sows and feed them complete formula feed; it is best to let the piglets accompany the sow outside the pen for activity. Red soil or deep dry soil can also be placed inside the pig pen and left for the pigs to eat freely; when necessary, supplement piglets with iron preparations. Treatment measures: Western medicine treatment: 1. Take 100 grams of ferrous sulfate and 20 grams of copper sulfate, grind and mix them into 5 kilograms of fine sand, scatter it in the pig pen, and let the pigs lick it freely. 2. Take 21 grams of ferrous sulfate and 7 grams of copper sulfate, dissolve them in 1000 milliliters of water, filter and take
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Key Technical Points and Benefit Analysis of Cotton Mulch Cultivation
In recent years, with the popularization and promotion of transgenic insect-resistant cotton and insect-resistant hybrid cotton, and the widespread application of plastic film mulch cultivation technology, cotton develops earlier and each plant sets more bolls earlier. Cotton in continuous cropping fields is highly prone to premature senescence. Mulching with straw in cotton fields already covered with plastic film can both promote early seedling development and prevent premature senescence of cotton, so cotton mulch cultivation technology is attracting more and more attention from cotton farmers. At present, cotton regions in the Yangtze River and Yellow River basins often use 2-row root-zone mulching, while ** cotton regions mostly use 4-row, 6-row and 8-row root-zone mulching. Plastic film mulching methods fall into two types: sowing cotton first and then covering with plastic film, and covering with plastic film first and then punching holes for sowing cotton, which should be selected according to local conditions. For cotton sown first and then covered with film, the moisture-conserving and warming effects are good; after the cotton emerges, when the cotyledons unfold and turn green, punch holes promptly to release the seedlings, keeping two plants per hole, and the seedling-release holes should be small; the seedling-release work should be done before 10 a.m. or after 4 p.m. After releasing the cotton seedlings, promptly seal the seedling-release holes tightly with moist good soil. With this method, attention should be paid to preventing high-temperature weather after sowing from scalding the seedlings under the film. For covering with film first and then punching holes for sowing, the film can be applied promptly after spring rain to conserve moisture, and holes are punched for dibbling according to plant spacing; after emergence, thin the seedlings immediately, keeping two strong seedlings per hole. With this method, if rain occurs after sowing, it easily causes rainwater to pour into the sowing holes, leading to serious seedling diseases; replant missing spots with reserve seedlings grown in nutritional pots.
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What are the key technical points for late-stage cotton management?
As autumn begins, cotton growth enters the late reproductive stage, dominated by boll opening and the completion of autumn boll development. This period centers on nourishing the roots and preserving the leaves, using scientific management methods to promote vigorous cotton plant growth, prevent premature senescence as well as excessive vegetative growth with late maturity and rotten bolls, and strive for a bumper cotton harvest. The specific management methods are as follows. 1. Drought resistance and waterlogging prevention After the Beginning of Autumn, drought is often severe. From mid-August to mid-September, the soil moisture content at 0-40 cm must be maintained above 55% of field capacity. Only under sufficient moisture conditions can cotton
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Q&A on Key Technical Points for Cotton Late-Stage Management
1. When does cotton late-stage management begin? Answer: Cotton field management after the end of the flowering and boll-setting stage is called cotton late-stage management. In China's Yellow River basin it generally begins in early September, and in the Yangtze River basin it generally begins in late August. 2. What is the main task of cotton late-stage management? Answer: The boll-opening stage is the key period determining cotton fiber quality, so first of all the focus should be on preserving bolls, increasing boll weight and increasing lint percentage; secondly, the focus should be on protecting roots, preserving leaves, promoting early maturity and preventing premature senescence; thirdly, the contradiction must be resolved between a bumper harvest and rotten bolls from rainy weather, excessive vegetative growth and late maturity, and a high proportion of stiff-boll cotton.
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Key Technical Points for Mechanized Micro-Pot Seedling Raising of Cotton
Traditional nutrient pot seedling raising methods have drawbacks such as high labor demand, complex seedbed management and high labor intensity during transplanting. The mechanized micro-pot seedling raising technology for cotton, developed by the Institute of Industrial Crops of the Jiangsu Academy of Agricultural Sciences and the Jiangsu Agricultural Technology Extension Center, breaks through the long-standing traditional model of cotton seedling raising relying on manual work and achieves the goal of saving labor and effort in cotton seedling raising. At present, the mechanized micro-pot seedling raising technology is at the experimental demonstration stage and has not yet been promoted and applied on a large scale, and farmers do not sufficiently understand and master the technology. For this reason, our newspaper's reporter interviewed Associate Researcher Zhang Peitong, a cotton cultivation research expert at the Institute of Industrial Crops of the Jiangsu Academy of Agricultural Sciences, about the advantages and disadvantages and detailed technical procedures of mechanized micro-pot seedling raising.
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