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What are the reasons for mass mortality of marine crabs during molting?
Mortality of marine crabs during the molting period manifests as large numbers of marine crabs dying before molting (failed molting), and many marine crabs also die after completing the molt (excessive physical depletion after molting, soft shells that do not harden, etc.). The reasons for mortality of marine crabs during the molting period are: (1) the water body is polluted, dissolved oxygen is low, affecting molting, leading to death; (2) nutritional imbalance in marine crabs (deficiency of calcium, phosphorus, magnesium, zinc, iron, vitamins, etc., weak constitution); (3) irritating drugs used during the molting period, causing some deaths; (4
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Why does home cultivation of Phalaenopsis fail? An analysis of four reasons
1. Overwatering: Friends who grow Phalaenopsis always worry that the orchid lacks water, and regardless of whether the growing medium is dry, they water it every day, causing severe root rot. 2. Temperature too low: Usually, flowering Phalaenopsis plants are mostly brought to market in early spring, and after being bought and taken home they are generally placed in places such as the living room for enjoyment. Although the daytime temperature in these places is sufficient, the nighttime temperature is somewhat on the low side. On the other hand, professionally cultivated orchids are mostly kept in well-equipped greenhouses. By comparison, the temperature and humidity at home are both somewhat insufficient, so the plants' growth tends to
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How to reasonably choose the suitable sowing time for wheat?
The suitable sowing time for wheat generally refers to sowing when the average daytime and nighttime temperature in autumn steadily drops to 18-15°C. Within this range, sow semi-winter varieties first, then spring varieties. By making use of the suitable natural conditions such as temperature and light in autumn and winter, strong seedlings can be formed before winter, which is conducive to safe overwintering and improves the tillering and ear-bearing rate and grain weight. Right now is the critical season for wheat sowing, and wheat across the province has begun to be sown from north to south. According to the requirements of different regions and different types of wheat varieties for sowing time, and in response to the issue of suitable wheat sowing time that farmers generally care about, the following suggestions are put forward
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What are the reasons rice seedlings are slow to tiller
1. Rice bakanae disease: Patterns of occurrence and routes of transmission: The pathogen of rice bakanae disease overwinters on grains and rice straw. The following year, if infected seeds or rice straw are used, the pathogen multiplies as the seeds germinate, invading through the coleoptile or wounds of the seedlings, causing the seedlings to develop the disease and grow excessively tall. Affected seedlings often wither and die. Infected seedlings that do not die are pale yellow-green, grow thin and elongated, generally about one-third taller than healthy seedlings; root development is poor, with few tillers or even no tillering. After infected seedlings are transplanted, they carry the pathogen into the field, causing rice plants to develop the disease. When rice heads and flowers,
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Analysis of the reasons why first-time mother pigs refuse to nurse
For first-time mother pigs refusing to nurse, the solutions are: 1. Fix the nursing positions. After farrowing is complete, arrange the piglets around the lying sow with the weak ones in front and the strong ones behind, let them find the teats on their own, observe and adjust promptly, and after 2 to 3 days they will be fixed in an orderly arrangement. 2. Treat udder inflammation. Whenever the milk is plentiful and the piglets have just started sucking the teats, if the sow immediately lets out a scream, jumps up suddenly and even tries to bite the piglets, it means the sow has mastitis
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How to Supplement Vitamins to Chickens in a Scientific and Reasonable Way
1. When the flock has a stress response (such as vaccination, moving to another house, etc.), an additional 10% of vitamins A, E, D, and C should be added. 2. When the flock has a chronic disease (such as chronic respiratory disease), an additional 10% of vitamins A, E, and C should also be added. 3. For chicks, the lower the vitamin A content in the feed, the higher the incidence of coccidiosis in chickens, so when chickens suffer from coccidiosis, an additional 20% of vitamins A, K, and C should be added to the feed. 4. When chickens suffer from fatty liver syndrome
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What are the reasons that azaleas drop their leaves and die after being watered with organic fertilizer?
After azaleas are watered with a liquid organic fertilizer that has been composted, abnormal leaf drop and death may occur for the following reasons: First, the eggshells and soybean residue may contain a small amount of table salt (sodium chloride), and the fine fibrous roots of azaleas are relatively sensitive to sodium ions, causing root rot, leaf drop, and death. Second, the 5% concentration may still be too strong for the fine hairy fibrous roots of azaleas, or the fertilizer liquid left at the end may have an even higher concentration, making it hard for the plant to withstand. Third, the timing of fertilization may be inappropriate, such as after the flowers fade, when new root tips have just emerged,
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Analysis of the Reasons Why Pepper Phytophthora Blight Is Never Cured
In Dongyi Village, Daotian Town, Shouguang City, a fairly wide variety of crops is grown, with tomatoes, peppers and cucumbers each showing their strengths. Old Wang in the village got a taste of success from growing peppers last year, so this year he planted peppers again. But recently, Old Wang has not been able to "taste the sweetness." Why? The peppers he planted showed symptoms of wilting, and this frightened him badly. "Peppers are most afraid of phytophthora blight; if it is not handled well, most of the plants in this greenhouse could be lost," said Old Wang. What puzzled Old Wang most was that he had done no small amount of disease prevention work in the early stage, right? He chose disease-resistant
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What are the reasons for fewer diseases in polyculture of fish and shrimp?
1 Polyculture area and species The total polyculture area of Pacific white shrimp (Litopenaeus vannamei) with milkfish (Chanos chanos) and male tilapia was 400 mu. A total of 330,000 milkfish fry were stocked, with 200 mu for polyculture of Pacific white shrimp and milkfish, 120 mu for polyculture of Pacific white shrimp and male tilapia, and 80 mu for milkfish monoculture as a control. 2 Pre-stocking work Before releasing the fry, pond clearing, pond drying and disinfection were carried out according to routine procedures. Seawater was introduced in a timely manner, and fertilizer was applied to cultivate basic bait organisms. 3 Stocking density and stocking period The number of fry to be released can be determined according to the pond conditions, management
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Reasons why pigs eat but do not put on fat, and how to solve it
During the growth process of pig farming, some pigs eat but do not put on fat. What is the reason? The causes and treatment methods are described below: Look for causes. First, check for congenital causes, such as inbreeding or breeding a young sow too early. Second, check for acquired causes: insufficient mother's milk, unreasonable grouping after weaning, with the big bullying the small; chronic diseases, such as anemia, white scour of piglets, and internal and external parasitic diseases; surgical diseases, such as intestinal adhesions after castration; unreasonable feed formulation, such as protein deficiency and trace element deficiency, etc., all of which can cause slow or stopped growth in pigs.
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