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Several Causes of Fish Gasping at the Surface and Their Prevention and Treatment Methods
Fish "gasping at the surface" is a phenomenon that frequently occurs in aquaculture production, and it is also an important sign for judging whether fish are diseased and whether water quality has changed. However, many farmers, after discovering pond fish "gasping at the surface," do not understand the cause and simply apply medication based on "experience," which often proves ineffective and may even cause mass mortality. In fact, fish "gasping at the surface" can be caused by multiple factors. According to the cause, "gasping at the surface" can be divided into the following 3 types. 1. Hypoxia-induced gasping. Hypoxia-induced gasping is caused by excessively low dissolved oxygen content in the water, causing cultured fish to swim to the relatively higher surface
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Detailed Explanation of Key Points of Scientific Chemical Topping Technology for Cotton
Chemical topping of cotton is one of the most difficult techniques for cotton farmers to master. According to research by relevant departments, chemical topping of cotton can affect 30% of cotton yield, but most cotton farmers apply chemical topping blindly, so it is very necessary to promote a simple and easy-to-understand cotton chemical topping technique. The experience accumulated over many years is introduced below. The following is only reference data for Switzerland Reach TM cotton pruning Zhenbuluo; cotton farmers should use it flexibly according to soil fertility, climate and actual growth conditions. 7~10 days after topping (around July 25): use 40 ml per mu diluted in 15
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How to manage cotton during the bud stage? Keeping it steady is the key
Currently, cotton is gradually entering the bud stage. As the saying goes: "For cotton to be high-yielding, steady growth during the bud stage is the foundation." Based on my investigations in the countryside and problems encountered during technical guidance, combined with this year's climate characteristics and cotton growth conditions, I believe that bud-stage management should be based on "simplification, labor saving, high yield, and high efficiency," centered on the word "steady," and measures should be flexible and tailored to the seedlings. The specifics are as follows: 1. Intertillage and earthing up. With the promotion of plastic-film cotton and the use of herbicides, the number of intertillage operations has decreased significantly, but necessary intertillage should still be
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Practical Guide to Fresh-keeping and Processing Techniques for Shiitake Mushrooms
1. Drying equipment: Although shiitake drying equipment at home and abroad differs in form, scale and technical level, its principle is basically the same. Generally there are the following models: (1) forced circulation dryer; (2) forced ventilation parallel-flow dryer; (3) heat pump dryer. 2. Drying methods (1) Raw material handling Before drying, trim off the mushroom stalks or stem bases from the freshly picked mushrooms, remove impurities, and process after grading. Mushrooms picked on rainy days or with high moisture content should first be spread out to air-dry so that
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What are the key points for fresh-keeping processing of shiitake mushrooms for export?
I. Raw material selection The raw materials must be fresh and of normal color. The mushroom caps must be intact in shape, the stems must be complete and unblemished, and the mushrooms must retain their elegant form as when growing naturally. The flesh must be thick, the cap edges must be evenly inrolled, the partial veil must be unbroken or slightly open, and the caps must not have opened. The cap diameter must be no less than 38 mm. Free of pests and diseases, off-odors, and soil impurities. II. Raw material handling and cold storage 1. Precooling and moisture removal of raw materials To maintain good freshness and color of the raw materials, fresh mushrooms must be promptly placed in a cold store for precooling and temperature reduction after harvest. According to equipment performance and the moisture content of the fresh mushrooms, maintain an appropriate
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Harvesting and Fresh-Keeping Methods for Outdoor Oleander Cuttings
[Other Chinese Names]Dajiezhong, Jiaochudong, Jiujiezhong, Juna, Liuyetao, Shuigancao[Family and Genus]Apocynaceae, Nerium[Place of Origin]Nepal, India, Iran and other places[Plant Characteristics]Oleander is an evergreen shrub or small tree. Plant height 5-6 m. It has milky sap. Simple leaves are whorled or opposite, linear-lanceolate, 10-25 cm long, entire, leathery.[Cutting Harvest]The harvested part is the current-year branches of oleander. Harvesting should be carried out from May to July each year. In order to obtain ideal
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Red-leaf privet is a common landscaping nursery stock variety
Red-leaf privet is a horticultural cultivar of the genus Ligustrum in the family Oleaceae. It is an evergreen small tree with opposite simple leaves; the branchlets are slightly covered with fine hairs, and the leaves are ovate, ovate-round to ovate-elliptic, thin leathery, extremely similar in leaf shape to Chinese privet (Ligustrum sinense), with stronger sprouting ability, faster growth and vigorous growth. Its new shoots and young leaves are purplish red, and against the backdrop of the old leaves they appear all the more vivid and dazzling. After being pruned several times, the new branches become dense and the whole crown turns purplish red, making it even more gorgeous and striking among green plant clusters. After winter sets in, the whole plant turns purplish black again, standing out even more among all things. Red-leaf privet
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Detailed Guide to Rapid Shaping Methods for Fruit Display Bonsai (Part 1)
The container is best a finely made unglazed clay pot, which needs good water permeability and air permeability to ensure the oxygen requirements for root growth and to prevent root rot caused by water accumulation in the container. Generally, round shapes are preferred to help the root system spread evenly in all directions. For cleft grafting, select branch groups that have been thinned by winter pruning (with 2 to 4 branches) as scions. The rootstock can be one where grafting failed or another dwarfed, vigorous rootstock. Perform the grafting 1 month before sap flow begins. Split the rootstock at the center of a smooth cut, 3 to 4 cm deep, insert the scion (with both lower sides cut obliquely into smooth flat surfaces, 2
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What are the key points for shaping a double-trunk bonsai?
The so-called double trunk refers to a tree with two trunks, as opposed to the single trunk, such as the straight trunk or curved trunk, which has only one trunk. Secondly, the trunks can also be distinguished by thickness and length: the thicker one is the main trunk, and the thinner one is the secondary trunk. If the secondary trunk is especially thin and short, the situation resembles that of a parent and child, and it is called a parent-child double trunk. (1) Selecting the planting material The primary consideration for the double-trunk tree style is harmony. This includes balanced factors such as the branching, length and thickness of the trunks, so special attention should be paid when selecting the planting material. At the same time, the following three points should also be grasped
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Detailed Explanation of the Climbing and Binding Shaping Methods for Suzhou Tree-Stump Bonsai
Suzhou tree-stump bonsai relies mainly on pruning, with binding as a supplement; coarse binding and fine pruning, using both pruning and binding together. Among these, climbing-binding and pruning are the keys to shaping the tree stump. Now the focus is on introducing its climbing-binding of branches. Suzhou tree-stump bonsai traditionally uses palm fiber for climbing-binding. The palm fiber harmonizes with the color of the bark, and after climbing-binding the tree stump is already ornamental. The key is to grasp the focal points for applying the palm fiber and to select the appropriate thickness of palm fiber. 1. Full binding method: all materials are nursery stock, and everything from the trunk (main trunk) to the branches (branch pads) must be fully climbed and bound. Its branch pads are divided into three types: "platform, support, top." "Platform" refers to the branch pads on both sides of the main trunk
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