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Detailed Explanation of Arrowhead Seed Retention Methods and Technical Key Points
Before collecting seeds, a seed retention field must be selected. Choose a high-yielding field plot with pure varieties, robust growth, light pests and diseases, and few bolting and flowering plants for seed retention, and harvest when the aboveground parts have completely withered. After harvesting, select corms that conform to the characteristics of this variety, are relatively large, heavy, and have relatively curved terminal buds as seeds. Curved terminal buds are conducive to nutrient accumulation and are not easy to sprout. The selected seed corms should have their terminal buds broken off, with a small part of the upper corm attached. That is, pour the arrowhead terminal buds into a 600-fold solution of 50% carbendazim and soak for 20-25 minutes, then remove
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Do Bighead Carp Eat Phytoplankton? An Analysis of Their Feeding Habits
Bighead carp mainly feed on zooplankton, but also consume phytoplankton. According to research by Professor Ni Dashu, the average ratio of zooplankton to phytoplankton in the diet of bighead carp is 1:4.5. In terms of quantity, phytoplankton predominates, but in terms of biomass it is far surpassed by zooplankton, since on average a single zooplankton is 10 times larger than a single phytoplankton or more. Therefore, from an analysis of the feeding habits of bighead carp, the occurrence rate of phytoplankton is not low, but it is still zooplankton that plays the main nutritional role. Given this situation, the original Guangdong experience still leaves room for improvement, namely that the ratio of bighead carp to silver carp
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Key points of polyculture technology mainly for silver carp and bighead carp
With filter-feeding fish such as silver carp and bighead carp as the main cultured fish, appropriately polyculture other fish, with special attention to polyculturing fish that feed on organic detritus. During the rearing process, the main method used is applying farmyard manure. 1. The stocking amount of silver carp and bighead carp accounts for 70% to 70% of the total, and their output accounts for 60% to 70%. Their large-sized fingerlings are obtained by the method of supplementary culture in adult fish ponds. Silver carp and bighead carp fingerlings begin to be caught in rotation from May, with 6 to 7 rotational catches per year. After each rotational catch, large-sized fingerlings are immediately stocked supplementarily, and the number of supplementary stocked fingerlings is generally roughly equal to the number caught. 2. Mainly apply farm
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What are the control methods for arrowhead leaf spot disease?
1. Symptoms This disease mainly damages leaves and leaf stalks. The leaf spots are yellowish-brown to brown, polygonal, elliptical or irregular in shape, slightly zonate, surrounded by a yellow-green or green-brown halo; the spots sometimes merge with one another into large lesions, and in severe cases the leaves turn yellow and wither. On leaf stalks, the disease often produces short, streak-like brown spots, and under high humidity a gray mold grows on the surface of the spots. 2. Transmission route and disease pattern This disease is caused by infection by the fungus Cercospora sagittariae of the subphylum Deuteromycotina. The pathogen mainly overwinters as mycelium and conidiomata on diseased plant residues
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Cage Culture Technology for Silver Carp and Bighead Carp Fingerlings: Using Small and Medium-sized Reservoirs as Broodstock Bases
As the main drinking water source for Beijing, Miyun Reservoir plays a decisive role in the capital's economic development and social stability. In order to scientifically convert the nutrients and aquatic organisms in the water body of Miyun Reservoir, purify the water quality, and protect this basin of "water of life" for the capital, after the cancellation of cage fish farming, the Miyun County government increased the amount of fingerlings stocked, releasing 485,000 kg, nearly ten million individuals, of silver carp, bighead carp, bream, grass carp and other fingerlings into Miyun Reservoir each year, aiming to reduce the nutrient load of the water body through fishery production. However
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How to Make Delicious Fish Head and Tofu Soup with Sheet Jelly Noodles
Cuisine: Sichuan cuisine. Ingredients: 2 fish heads, 50 g each of shiitake mushrooms and winter bamboo shoots, 100 g tofu. Instructions: First deep-fry the fish heads briefly; then add a little doubanjiang (fermented broad bean paste), scallions, ginger, and minced garlic, add broth and bring to a boil, then skim off the solids, add the shiitake mushrooms, sliced winter bamboo shoots, tofu, soy sauce, salt, MSG, pepper, and cooking wine; once the fish heads are cooked, add the sheet jelly noodles, and when the soup comes to a boil, thicken with a cornstarch slurry and sprinkle with green garlic. That's it.
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Detailed processing method introduction for butterfly pig head
The butterfly pig head has a cured yellow color, a delicious and mellow aroma, a purplish-red tint, and is fatty but not greasy, and is deeply loved by consumers. (1) Material selection: choose healthy, disease-free pig heads with no injuries or disabilities, a full head, moderate size, and intact ears, nose, and mouth. (2) Ingredients: for every 50 kg of fresh pig head meat, use 4 kg of refined salt, 50 g each of Sichuan pepper, ginger, and star anise, 150 g of baijiu, 25 g of saltpeter, and an appropriate amount of spices. (3) Preparation: debone the pig head, pluck clean the fine hairs, remaining hairs, and hair roots on the scalp, and rinse clean with 40°C warm water. (4) Curing: evenly coat the washed and drained pig head with the ingredients
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How to prevent and treat hemorrhagic ascites disease in bighead carp? A detailed guide to prevention and treatment strategies
As bighead carp has gradually become popular in the market, most ponds on the outskirts of our city have shifted from raising bighead carp as a secondary species to raising them as the main species. Bighead carp yields have grown from several dozen jin per mu when raised as a secondary species to over a thousand jin per mu now that they are the main species. Due to the increase in bighead carp farming density, the disease rate in bighead carp has also risen year by year, and mortality has climbed continuously, causing certain economic losses to farmers. Hemorrhagic ascites disease in bighead carp is an explosive infectious disease, also known as bacterial septicemia, and is caused by bacteria. Before the diseased fish die, they mostly swim slowly around the pond with darkened backs, and the mouths of the diseased fish
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First Foreign Head of State Visits Flora Expo: President of Nauru and Wife Listen to the Sound of Flowers Blooming
Taichung Flora Expo continues to draw crowds, with visitor numbers surpassing 3 million; yesterday (the 9th) it welcomed its first foreign head of state, President H.E. Baron Divavesi Waqa of the Republic of Nauru, an ally of our country, and his wife, who visited the Houli park and were personally received by Mayor Lu Shiow-yen...
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What are the main varieties of arrowhead? Introduction to common varieties
(1) Shagu is a local variety of Guangdong. The plant height is 70-80 cm, and the spread is 60-70 cm. The corm is oval, 5 cm high, and 4 cm in transverse diameter; both skin and flesh are yellowish white. Each one weighs 40-60 g. It contains a lot of starch, has only slight bitterness, and tastes good. It does not store or transport well. From planting to first harvest is 110-120 days. In February, corms are used for raising seedlings; in July-August they are planted; from December to February of the following year they are harvested. The yield per mu is 1000 kg. (2) Bairou Cigu has a plant height of 70-75 cm and a spread of 80 cm.
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