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Prevention and Control Methods and Technical Key Points for Complications in Fingerling Fish
An unusual combination of complications - rotten gills, enteritis and hemorrhage - once occurred in fingerling fish in Sanhe Town, Hongze County, Huai'an City, Jiangsu Province, causing large-scale deaths of fingerlings. The specific details of the disease and its prevention and control measures are summarized below for everyone to discuss together. Onset time and symptoms: In early August, scattered dead fish appeared, and the diseased fish had Trichodina on their gill filaments, with no other symptoms. Around mid-August, mass mortality occurred, and all were grass carp fingerlings. The diseased fish turned dark in body color and showed a behavior of lying at the edge, floating weakly by the pond bank and stopping feeding. When the diseased fish were scooped up
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What are the key technical points for winter rearing of broodstock?
Broodstock rearing is divided into stages such as post-spawning care, autumn rearing, winter rearing and spring rearing. Because winter temperatures are low, broodstock activity decreases, their feeding ability is weaker and they are prone to fish diseases; if management is poor, it will have a great impact on the next year's artificial hatching, fry and fingerling production, market-size fish farming and other production stages. The key technical points for doing a good job of winter broodstock rearing are: 1. Pond selection. Broodstock ponds require an adequate water source, a flat pond bottom, shelter from wind and exposure to sun, and good water and heat retention, with an area of 10-15 mu being suitable.
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Master the key technical points of winter goose fattening, get good returns by marketing before the Spring Festival
Good returns from marketing winter geese before the Spring Festival; key technical points of winter goose fattening
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How to strengthen cultivation and management during the cotton bud stage? Keep these technical key points in mind
After cotton transplanting this year, continuous drought and little rain, unstable temperatures, and a long seedling-hardening period seriously affected plant development. In addition, large populations of aphids and red spider mites caused severe damage, leading to a second seedling-hardening in cotton seedlings, with a few seedlings showing red stems all the way to the top and true leaves drying up and falling off. Recent rainfall has alleviated the drought, and seedling conditions have begun to improve. Transplanted cotton now has 7-9 true leaves and has begun to form buds, and cotton after wheat (rapeseed) has also begun to develop, but overall seedling conditions are not as good as in previous years. The bud stage is the most important period in the life of cotton, and the following cultivation and management measures should be emphasized
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How to cultivate cotton during the squaring stage? A detailed explanation of the key technical points
In 2008, the climate during the cotton squaring stage was extremely unfavorable for cotton growth, with low temperatures and high humidity, causing cotton growth to lag 3-5 days behind the same period in previous years, with severe cotton diseases and generally weak growth. How to strengthen management during the squaring stage and build a good framework for high yield? The following points should be noted in management: Apply squaring fertilizer steadily: Apply fertilizer scientifically according to soil fertility conditions, base fertilizer application, and cotton growth. Focus on phosphorus and potassium fertilizers. For cotton fields with high soil fertility, sufficient base fertilizer, and vigorous growth, it is not suitable to apply nitrogen fertilizer as a top dressing; instead, 25-40 kg of cake fertilizer per mu may be appropriately applied.
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Detailed Explanation of Pre-Sowing Preparation and Sowing Technical Points for Cotton
Sowing is the foundational step for achieving high-quality, high-efficiency cotton. To guide the vast number of cotton farmers in scientific cotton cultivation, the following sowing techniques are proposed. 1. Select excellent cotton varieties, with emphasis on early-maturing varieties. Such as the nationally approved "Ji 668" and 99B and other excellent varieties. To ensure full stands, a germination test must be done before sowing to determine the appropriate sowing rate. The sowing rate for machine sowing is about 2 kg/mu; the sowing rate for manual dibbling is about 1.5 kg/mu. 2. Adopt plastic film mulching technology. Plastic film has the effects of increasing temperature, preserving soil moisture, and promoting
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Key Technical Points for the Use of Different Chemical Control Agents on Cotton
Chemical control of cotton means using chemical regulation methods to shape cotton into an ideal plant type and create a high-photosynthetic-efficiency population. In this way, plants can grow vigorously, pest and disease occurrence can be reduced, cotton yield can be increased, and quality can also be improved. However, there are currently many chemical control agents, and correct application techniques should be adopted according to different agents to achieve better results. 1. Mepiquat chloride. At present, mepiquat chloride is widely used in cotton chemical control, and its effect is also relatively ideal. It can reduce cotton plant height, decrease the number of fruiting branches, promote the shift of photosynthesis toward reproductive growth, reduce cotton boll
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Detailed Explanation of Fertilization and Watering Methods and Technical Points for Schisandra chinensis
(1) Watering and Fertilization. Schisandra chinensis (five-flavor berry) prefers fertilizer and needs sufficient water and nutrients during the growing season. After planting and establishment, water frequently to keep the soil moist. Irrigate once before the ground freezes to aid overwintering. During the bud differentiation, flowering and fruiting stages, in addition to sufficient water, large amounts of nutrients are also needed. Apply chemical fertilizer twice a year: the first application during the leaf expansion stage, with quick-acting nitrogen and potassium fertilizer. The second application after the plants flower (mid-growth period, early July), with quick-acting phosphorus and potassium fertilizer. As the plant grows larger, the fertilizer amount increases year by year: ammonium nitrate 25-100 g/plant, superphosphate
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What are the key technical points for managing Schisandra chinensis during its growing period?
1. Water management: In the first year after planting, water should be applied multiple times to ensure soil moisture content, thereby ensuring the survival rate of the seedlings and the normal growth of young trees. For trees that have entered the fruiting stage, in a normal year, ensure 4-5 waterings: pre-flowering water, post-flowering water, fruit-swelling water, and freeze-up water, while combining with intertillage and weeding. After watering, loosen the soil immediately to preserve moisture and prevent soil compaction. 2. Fertilization management: In the first year after planting, in early to mid-June, apply 15-20 kg of urea per 667 sq m as a top dressing. For 2-year-old plants, in early May, apply phosphorus
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Seed propagation methods and key technical points for Schisandra chinensis
1. Seed treatment: From late August to mid-September, harvest ripe fruit, rub off the peel and flesh, float off shriveled seeds, and dry in a cool place. In mid-to-late December, soak the seeds in clean water for 3-4 days, changing the water once daily, then mix the wet seeds with clean fine river sand at a ratio of 1:3. The sand moisture is usually kept at the level where it forms a ball when squeezed tightly in the hand without dripping water (absolute moisture content of about 40%-50%). Place in a wooden box or flower pot for storage, keeping the temperature at 0-5°C. In Northeast China, before the soil freezes,
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