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Prevention and Control Methods and Technical Key Points for Protozoan Diseases in Large Yellow Croaker
(1) Pathogen: Cryptocaryon irritans (Crypjocaryonirrions). (2) Symptoms: Small white spots appear on the body surface and gills of diseased fish. These small white spots are white vesicles formed by the parasitism of the parasite, irritation of the host, and the secretion of large amounts of mucus and proliferation of epidermal cells in the surrounding tissues. In severe cases, the body surface tissues are destroyed. If bacteria invade, it can cause skin inflammation, scale loss, fin membrane rot and splitting, corneal damage, and blindness. The diseased fish ultimately die due to loss of appetite,
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What are the key technical points of Taishan eel farming in earthen ponds?
The Taishan earthen pond eel farming model is an extensive farming model developed by referring to the earthen pond farming model for Chinese carp. Its characteristics are: ① The ponds are large, generally more than 4 mu, up to 20-30 mu, and developed in contiguous tracts; ② The stocking density is low; ③ Water sources are insufficient, and the water is used for a whole grow-out cycle, with a water depth within 1.2 m; ④ The soil quality is good, mainly loam; ⑤ Aeration facilities are fully equipped; ⑥ The feeding method is to feed to satiation at every meal until feed remains; ⑦ The annual grow-out rate is above 90%. Taishan earthen ponds are mostly developed from land created by reclaiming land from the sea and enclosing it into fields, and the soil is mostly loam, with water retention performance.
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How to carry out field management of cotton during the flowering and boll stage? Technical Q&A
1. What is the flowering and boll stage? The stage from flowering to boll opening, generally from early July to early September. There is a farming saying, "flowers see flowers forty-eight," but in fact in China's Yellow River basin it generally takes 50-70 days. When 10% of the cotton plants in the field have flowered, it is called the initial flowering stage; when 50% have flowered, it is called the flowering stage. When 50% of the cotton plants have the first fruiting node of the fourth fruiting branch flowering, it is called the full flowering stage. 2. What are the management principles during the flowering and boll stage? The initial flowering stage is the transition from vegetative growth to reproductive growth, and management should focus on control, preventing
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Technical Points for Spraying Foliar Fertilizer on Cotton to Increase the Boll Setting Rate
This year, the summer-ripening crops in Haimen City were delayed in maturity due to climate effects, and after the summer harvest there was a continuous drought until mid-July, when it rained heavily for several consecutive days. This weather pattern of drought followed by rain was very unfavorable for the survival and growth of the already delayed transplanted cotton, and the growth process was delayed by about 10 days compared with normal years. To increase the formation speed of flower buds in the late stage of cotton and improve the boll setting rate, it is recommended to strengthen fertilizer management in the late stage by means of foliar spraying. 1. Combine pest control with proper timing of fertilizer application. Not every pest control treatment requires
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Detailed Explanation of Key Technical Points for Formula Fertilization of Cotton
Cotton has an indeterminate growth habit, strong regeneration capacity, highly controllable plant architecture, and a high fertilizer demand. Generally speaking, adequate fertilizer is the foundation for high yield and quality in cotton. Sufficient phosphate fertilizer can promote vigorous growth of cotton plants, increase boll weight, and advance maturity. Potassium fertilizer is a catalyst for various enzymes in plants, and can promote photosynthesis and cellulose synthesis. The fertilization technique for cotton is the eight-character formula fertilization method of "adjust nitrogen, increase potassium, supplement phosphorus, spray boron." Specifically, the following 5 technical measures should be well implemented. 1. Attach importance to the application of farmyard manure
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How to Apply Fertilizer Skillfully to Cotton? A Explanation of Practical Technical Points
Fertilizer is the material basis for high cotton yields, and applying fertilizer according to need is the highest principle of cotton fertilization. Where conditions allow, soil testing and fertilizer recommendation should be carried out, and based on the available nutrient content of the soil and the needs for high cotton yields, the type and amount of fertilizer to apply should be determined. For most cotton fields in the north, the amount of potassium fertilizer should be increased, the amount of phosphorus fertilizer reduced, and nitrogen fertilizer mainly used for topdressing, or a formula fertilizer with "high potassium, low phosphorus, medium nitrogen" should be applied. If a compound fertilizer with equal amounts of nitrogen, phosphorus and potassium is used, the amount per mu should not exceed 25 kg, plus an additional 12.5 kg of potassium fertilizer
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Several Key Technical Measures for Increasing Gastrodia elata Yield
Gastrodia elata is a precious Chinese medicinal herb. In order to solve the problems commonly found in current artificial cultivation of Gastrodia elata, such as unstable yield, severe degeneration, and susceptibility to pests and diseases, the Edible Fungi Research Institute of our county carried out research on high-yield, stable-yield, and high-quality cultivation models for Gastrodia elata, and achieved certain results. The several techniques for how to increase Gastrodia elata yield are summarized as follows: 1. Choose a suitable cultivation site: Gastrodia elata is suitable for growing in areas with cool summers and winters that are not very cold. It requires moist soil, but not waterlogged, and rich in humus.
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Winter Management Methods and Technical Key Points for Gastrodia elata in Jilin Province
Jilin Province has a long, cold winter, during which Gastrodia elata is in a dormant state. Preventing freezing damage and rot in Gastrodia elata is the key to achieving a bumper harvest. ① Management of pit-cultivated Gastrodia elata. Pit-cultivated Gastrodia elata usually overwinters outdoors. Before the onset of winter, the soil moisture in the Gastrodia elata pit should be kept at 30%-40%, and excessively wet conditions and water accumulation should be prevented. Drainage ditches should also be dug around the Gastrodia elata pit to prevent snowmelt water from flowing into the pit. Before freezing, cover the Gastrodia elata pit with a 15 cm thick layer of leaves or weeds, then add 20-30 cm of cold-protection
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A Complete Analysis of Gastrodia Planting Methods and Technical Key Points
Gastrodia, also known as Chijian Dingfengcao, Mingtianma, etc., is the species Gastrodia elata of the orchid family. Its tuber is used as medicine, and it has the effect of calming wind and relieving spasms; it mainly treats rheumatic waist and knee pain, limb spasms, dizziness and headache, and infantile convulsions. Gastrodia is a perennial symbiotic herb; the mature plant has an underground tuber and an aboveground flower stem. It has no roots, the stem is single and upright, 100-100 cm tall, with no green leaves, only degenerated scale-like leaves that clasp the stem; the raceme is terminal, and the tuber is fleshy and enlarged, oblong. Living gastrodia prefers a cool and humid climate, with relative humidity between 70% and 90%.
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Key Technical Points for Summer Management of Gastrodia elata in Northern Shaanxi
Gastrodia elata prefers to grow in warm, moist sandy (or leaf-mold) soil and has relatively strict requirements for temperature and humidity. However, the area along the Great Wall in northern Shaanxi lies in the mid-temperate zone, where summers are hot and dry with little rain, which is unfavorable for the growth and development of Gastrodia elata. To achieve a good harvest of Gastrodia elata, the measures that should be taken in summer management are: (1) Build a shed for shade. In summer, especially at noon during the hot dog days, due to direct sunlight, the ground temperature at 20 cm below the surface (already close to the Gastrodia elata layer) reaches as high as 30-37°C. To keep the ground temperature at 20-28°C
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