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Experimental Study on Factory-Scale Rapid Propagation Technology of Potato Test-Tube Plantlets
For many years, farmers' own propagation, self-breeding and seed retention have caused potato yields to decline year by year during production, quality to deteriorate, and commercial appearance to worsen. Scientists have proven through research that virus infection and its accumulation in tubers are the main causes of potato "degeneration." To solve the problem of severe degeneration and reduced yield of the main potato cultivars in our city, our institute made virus-free potato production a key experimental project and conducted experimental research on the problems existing in virus-free production, thereby utilizing resources and reducing production costs.
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What key factors must be emphasized in healthy farming of Ezo scallops?
Since the 1980s, floating-raft farming of Ezo scallops has developed rapidly in Changhai County, Liaoning Province. At present, the farming area has reached more than 100,000 mu, and it has become an important local famous, special, and high-quality marine aquaculture species, occupying a very important position in the development of the marine fishery economy. Although Ezo scallop farming technology has been rapidly promoted, during operations, due to negligence in certain technical links, the mortality rate during farming has continued to rise, and the specifications, quality, and fullness of commercial scallops have declined somewhat, thereby affecting the economic benefits of the industry. Based on many
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What meteorological factors does jujube tree growth require?
Germination stage: when the daily average temperature reaches 13--14°C, germination begins; at 17°C, leaves unfold. Flowering stage: when the daily average temperature reaches 19--20°C, flower buds appear, and at 20--22°C flowering begins. During full bloom, the optimal temperature is 22--27°C and the relative humidity is 60%--70%. A relative humidity below 25% will cause a large amount of "scorched flowers" and young fruit drop. Fruit ripening stage: the optimal temperature for fruit development is 25--27°C, with relative humidity around 75%. Optimal temperature during the fruit ripening stage 1
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Four unfavorable factors in paddy field management
1. The time for land preparation and field soaking is short, the clods are large, and seedlings are transplanted before the soil is thoroughly soaked; salt removal and alkali washing are incomplete, making salt damage likely and harming seedling growth and development. 2. This year there are many windy days and cloudy days with large temperature differences, so the seedlings cannot be properly ventilated and hardened, which is unfavorable for recovery after transplanting. 3. The masses have a relatively strong fear of water, transplanting in deep water and managing with deep water, which is unfavorable for raising soil temperature after transplanting, early rooting, early seedling growth, and early tillering. 4. Water stored from last winter to this spring is of poor quality, and soil salinity is high, making the rice growing environment unfavorable.
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What are the four major factors that determine the success or failure of chicken immunization?
I. Vaccine factors 1. Selection of vaccines: Products produced by biological products enterprises that have passed GMP acceptance and have a formal production license and approval number from the Ministry of Agriculture should be purchased. When purchasing, carefully inspect the vaccine vials. Any vial that is broken, has no label, has unclear label printing, has a loose cap, contains impurities, has changed color, shows separation of the emulsion layer in inactivated vaccines, is expired and ineffective, or has not been stored under the prescribed conditions must not be selected. 2. Storage of vaccines: Store strictly according to the requirements of the instructions, avoiding repeated freezing and thawing caused by fluctuating temperatures, which can inactivate the vaccine or reduce its potency; direct sunlight is strictly prohibited; vaccines that have been diluted and are not used up, as well as vaccine vials and instruments, must be inactivated.
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What are the causes and stress factors of swine high fever syndrome?
Causes: Swine high fever syndrome is essentially a swine disease caused by mixed infection with multiple viruses, bacteria and protozoa triggered by immunosuppressive swine diseases. Biological factors: mixed infection with pathogens such as classical swine fever virus, circovirus, porcine reproductive and respiratory syndrome virus, pseudorabies virus, Eperythrozoon, Toxoplasma, Streptococcus, Salmonella paratyphi, Mycoplasma, Actinobacillus pleuropneumoniae, Haemophilus parasuis and Pasteurella. There can be more than 15 kinds of pathogens, among which classical swine fever virus has the highest infection rate and is the most typical; mixed infection with Toxoplasma, Eperythrozoon, porcine reproductive and respiratory syndrome virus, circovirus and classical swine fever virus is common, and there is also mixed infection of classical swine fever virus with piglet paratyphoid bacillus, often dominated by classical swine fever virus, together with one or more than two kinds of viruses, bacteria and protozoa, so the mortality rate is high, the cure rate is low, and it may even wipe out the whole herd.
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What are the three key factors for turtle egg incubation? Master the key points to improve the hatch rate
The key to turtle breeding is doing a good job of turtle egg incubation. No matter which incubation method is used, the three key factors of incubation temperature, humidity and ventilation must be well controlled. According to our farm's incubation experiments in recent years on the eggs of different turtle species such as the three-striped box turtle, alligator snapping turtle, yellow pond turtle and hawk turtle, as long as temperature, humidity and ventilation reach the optimal state, the hatch rate of turtle eggs can reach 93%-98%. 1. Incubation temperature The suitable temperature for turtle egg incubation should be controlled at 28°C-35°C, with about 30°C being best. It must not be too high or too
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Experimental Demonstration and Application of Factory-Based Soilless Seedling Raising of Cotton in the Dongtai Area
Factory-based soilless seedling raising of cotton is a seedling revolution in the history of cotton cultivation. It breaks the decades-old cultivation system of raising seedlings in nutrient pots and transplanting them, making cotton seedling raising and transplanting a simple, rapid, time-saving, labor-saving and cost-saving cultivation method, and opening up a new path for cotton cultivation. In 2003, Dongtai City introduced factory-based soilless seedling raising and transplanting trials. In 2004 and 2005, this technology was introduced successively in Tangyang and Luegang for soilless seedling raising and large-area transplanting trials and demonstrations. The details are summarized as
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What environmental factors affect the appearance quality of bag-cultivated Ganoderma (reishi)?
Ganoderma, as a medicinal fungus, has its medicinal value and commercial value directly related to the quality of its fruiting bodies. Cultivating fruiting bodies with well-developed caps and good maturity is the ideal goal of medicinal Ganoderma producers. Ganoderma fruiting bodies are quite sensitive to environmental factors such as temperature, humidity, aeration and light. If conditions are unsuitable, deformed mushrooms are very likely to appear. Strictly regulating environmental factors is a necessary measure to improve the finished-product rate and appearance quality of Ganoderma. 1. Temperature factor. Ganoderma fruiting body primordia can form in large numbers at 25-30°C, form less and grow slowly below 22°C, and although they can form above 34°C, they very easily form nodular protrusions after primordium formation and stop developing; Ganoderma caps grow faster at 28-30°C, with sparser concentric rings and lighter surface color, while at 24-26°C the growth period is longer, more active ingredients accumulate, and the texture is harder, so Ganoderma grown at this temperature has better quality. To balance growth time and fruiting body quality, the room temperature during the primordium differentiation and growth stage is best controlled at (28±1)°C, and during the cap growth stage at (26±1)°C. In cultivation practice, the temperature control methods are: (1) arrange the mushroom emergence time appropriately according to local natural temperature conditions; in central and southern Hebei, early June to early September is more suitable; (2) when the temperature is 30°C, appropriate shading, sprinkling well water on the ground combined with ventilation, etc. can lower the room temperature by about 1-3°C; (3) production units with the means can use automatic temperature control equipment, for better results.
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What are the factors affecting the efficacy of fishery drugs?
1. Dosage and dosage form of the drug. The effect of a drug varies with the dosage, and may even change qualitatively. For example, when the astringent metal drug zinc sulfate is used topically, a low concentration has an astringent effect, a medium concentration has an irritant effect, and a high concentration has a corrosive effect. Different dosage forms of a drug, even when the drug dosage is the same, also differ in the strength, effect and duration of action. 2. Route of administration. The route of administration, time of administration, number of administrations and repeated medication all
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