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Detailed Explanation of Key Technical Points for Pollution-Free Fish Storage and Transportation
The entire process of farmed aquatic products from pond to table is subject to safety and quality monitoring, of which storage and transportation is one of the important links. If errors occur in storage and transportation, the so-called pollution-free status will be lost at the final step. 1. The water quality used for storage and transportation shall comply with the relevant national regulations. During storage and transportation, fish should be handled gently and transported gently, avoiding squeezing and collision, and care should be taken not to let them dehydrate or lose ice. 2. Packaging containers should be non-toxic, odorless, clean, sturdy and have good drainage conditions. Live fish can be held in canvas buckets, live fish boxes or nylon bags with oxygen, while fresh fish use bamboo
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Control Methods and Technical Key Points for Scaly Leg Mite Disease in Chickens
Scaly leg mite disease in chickens is a condition caused by sarcoptic mites, often presenting as two forms: depluming itch and scaly leg. 1 Pathogen and Symptoms The pathogen of depluming itch in chickens is the scaly leg mite (Knemidocoptes mutans), which is round or oval in shape and about 0.3 mm long. This mite mostly invades the skin along the feathers and parasitizes the base of the feathers, causing inflammation. Lesions are mostly seen on the back, wings, rump, and thighs of chickens, with severe localized itching and feather loss, hence the name depluming itch. Affected chickens peck and pull at their feathers, causing feathers to fall out, the skin to become red, and
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Tea Plant Cutting Propagation Methods and Technical Key Points
One of the asexual propagation methods for tea plants. A portion of the vegetative organs of a tea plant is inserted into a moist, loose red-yellow soil nursery to form a new, complete plant. Tea seedlings propagated by cuttings exhibit heredity similar to the mother plant and, under the same environmental conditions, can maintain the traits and characteristics of the mother plant. Types of cuttings: these can be summarized as: stem cuttings, leaf cuttings and root cuttings. ① Stem cutting methods include long-shoot, medium-shoot, short-shoot, hoop-strip and old-stem cuttings, etc. Using a complete tea branch as a cutting for propagation
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How to defend tea plants against heat damage? A detailed explanation of practical technical measures
Tea plant heat damage refers to the meteorological disaster that, under long-term high-temperature and dry climate conditions, causes tea yield reduction, stunted tea plant growth, or plant death. The tea plant originated in the subtropics and is a perennial evergreen plant, with the habit of preferring warmth and humidity, tolerating shade, and fearing drought. When there is prolonged high temperature and severe drought, scorching sun, low rainfall, and relative air humidity below 50%, leaf transpiration intensifies, and the water absorbed by the root system cannot compensate for the consumption of the aboveground parts, thus causing the tea plant to wither, drop leaves, and even die. To prevent tea plant heat damage, in addition to selecting heat-resistant tea
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Detailed Explanation of Tea Plant Pruning Methods and Technical Key Points
Tea plant pruning is a measure carried out on the basis of comprehensive management of soil, fertilizer and water in the tea garden, in which, according to the natural conditions of each area, tree age and growth habits of the variety, the distribution and transport of nutrients in the tea plant body are appropriately controlled and regulated, so that nutrients are rationally utilized and distributed. However, it must be closely coordinated with fertilizer and water management, combined with plucking and leaf retention, and attention must be paid to pest and disease control, so that the tea plants recover quickly and grow well after pruning. Formative pruning: For the first formative pruning of young tea plants, the height and branch thickness have a close bearing on the strength and number of future branches.
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What are the technical requirements for tea plant pruning?
Tea plant pruning should level the canopy surface. When carrying out light pruning, thick vigorous branches that protrude in the middle should be cut 3-5 cm lower than the flat plane. For winter pruning time, tea gardens in low mountains should be pruned around Great Cold, and tea gardens in high mountains around the Beginning of Spring.
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What technical points should be noted when introducing tea plants?
Tea plant introduction is simple and easy to achieve results. Since the 1950s, the area planted with improved varieties has been expanded. For example, the Yunnan large-leaf variety was introduced to Guangdong, Guangxi, Sichuan, Guizhou and other provinces and autonomous regions, and the area has reached more than 1 million mu. Fujian, Zhejiang and other provinces used introduced and acclimatized Yunnan large-leaf varieties as original material to breed a group of excellent high-yield new varieties. New progress has been made in introducing tea from the south to the north. The northernmost boundary of tea plant distribution in China has shifted from about 34°40'N to near 37°49'N, advancing northward by more than 350 km. Tea varieties have also been introduced successively from the former Soviet Union, Ja
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Tea plant sexual-line breeding methods and key technical points
A breeding method in which sexual progeny of tea plants are produced through the union of male and female gametes and, after selection, new cultivars are developed. The cultivars developed are called sexual-line cultivars. The methods are: 1. Selection of superior individual plants or types: according to the breeding objectives, carry out individual plant selection or group selection from the original material nursery or production tea gardens; 2. Seed collection and seedling raising: for the initially selected individual plants or groups, separately reserve and collect seeds, and raise seedlings separately by line, carrying out identification of seedling-stage traits and cultivar purity; 3. Family or group comparative trials: arrange comparative trials of the selected families or groups together with control
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Detailed Explanation of Drought Prevention and Drought Resistance Technical Measures for Tea Seedlings
Whether a newly developed improved-variety tea garden can achieve full stands, uniform seedlings and grow well into a mature plantation depends first and foremost on whether it can safely pass through the summer-autumn drought period. This year's climate is quite unusual; just after the plum rain ended, the scorching sun hung overhead, and since early July there has been continuous high temperature, with some districts and counties experiencing 38°C-39°C for 7-8 consecutive days, severely threatening the growth, development and survival of tea seedlings. In our city, tea seedlings are most easily killed by sunburn in July and August, so how to do a good job in drought prevention and drought resistance for seedlings is crucial. Six aspects must be achieved: "shade", "cover", "irrigate", "fertilize", "
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Identification Methods and Technical Key Points for Tea Plant Breeding Materials
Observe the traits of breeding materials, analyze the characteristics and features of various variant materials, select the superior and eliminate the inferior according to breeding objectives, and finally develop new varieties through comparative trials. The identification content is divided into 3 aspects: yield traits, quality traits and resistance. The yield traits of tea plants are mainly reflected in sprouting density and bud-leaf weight, growth speed, length of growth period, regeneration capacity after picking, and recovery capacity after suffering disasters or wounds; quality traits are mainly reflected in the chemical composition, color, pubescence,
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