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What are the control methods for zinc deficiency stunt seedling in rice?
Phosphorus deficiency stunt seedling generally occurs at the tillering stage after seedling recovery, manifesting as slow growth, short plants, slender and upright leaves, dark green leaf color, neat leaf cluster tips, significantly shortened leaf sheath distance, red tips on some tiller leaves, and brownish-red or even dead old leaves. Causes: first, the soil lacks available phosphorus; second, low soil temperature and water temperature, or the presence of reducing harmful substances such as hydrogen sulfide and ferrous iron in the soil, which reduces the root's absorption capacity; third, excessive application of nitrogen fertilizer, causing the effective nutrients to lose their relative balance. Control measures are based on the available phosphorus data measured by the "soil testing and fertilizer recommendation method"
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Scientific control methods for the first-generation Asiatic rice borer (Chilo suppressalis) in rice
According to surveys conducted across Hubei Province, the overwintering mortality rate of the Asiatic rice borer this year was higher than last year, and the post-winter population base was lower than last year but still relatively high. In addition, suitable climate conditions and the expansion of high-quality rice varieties are both favorable to the occurrence and damage of rice stem borers, and the first-generation Asiatic rice borer will show a major outbreak trend in the rice-growing areas of our province, making the control situation still severe. In response to this severe situation, all localities should strengthen leadership, raise awareness, actively organize control efforts, and quickly launch a campaign to wrest grain from the pests to ensure the safety of grain production. 1. Recognize the situation clearly and strengthen organizational leadership. Last winter, our province suffered freezing ice and
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Symptoms and control methods of diplostomiasis in fish
Main pathogens: Diplostomum spp., cercariae, metacercariae. Affected species: silver carp, bighead carp, etc. Optimal control period: May to August. Identification features: diseased fish have a blackened body and are thin and weak; in the early stage of acute infection, diseased fish struggle by leaping at the water surface, or swim rapidly in the water, and when their strength is exhausted they swim slowly with the head down and tail up, losing balance, and the body may bend or there may be severe congestion around the head and eye sockets; in chronic infection, the cornea of the fish eye becomes cloudy and milky white, and in severe cases the lens falls out, resulting in blindness. Control
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Pollution-Free Fish Disease Prevention and Control Methods and Technical Key Points
Animal-Plant Symbiosis: Aquatic plants and fish coexist in the same pond, and the fish rarely get sick. The aquatic plants planted in the fish pond are rice or lotus root, oriented east-west, with a wide row spacing (greater than 33 cm), occupying no more than 50% of the total water area, so that the lighting effect is good. The water depth depends on the water tolerance of the aquatic plants; rice is generally within 30 cm, while lotus root can generally reach over 50 cm. The farmed fish can be conventional or famous, special, and excellent new varieties. The farming method can be fry rearing or grow-out fish farming. Because residual bait, fish feces, and other matter deposit at the bottom of the pond, ferment, and rot, not
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What are the prevention and control methods for feather-pecking vice in layer roosters?
Layer roosters are generally raised for about 3 months before being sent to market, mostly kept on the floor, and feather-pecking and flesh-pecking are serious problems that often cause certain economic losses. The following methods can be used for prevention and control. 1. Beak trimming is carried out at around 9 days of age; two days before beak trimming, start adding vitamin K3, electrolytic multivitamins and antibiotics. 2. Adjust the feed formula: reduce the amount of plant-based protein feed, increase the proportion of animal-based protein feed such as fish meal and meat-and-bone meal, appropriately increase the proportion of high-fiber feed such as wheat bran, and add vitamins and mineral
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Symptoms and control methods of soybean anthracnose
Symptoms: The disease can occur from the seedling stage to the mature stage. It mainly damages stems and pods, and also damages leaves or petioles. When stems are infected, brown lesions first appear, densely covered with irregularly arranged black dots. When pods are infected, the small black dots are arranged in concentric rings, and the diseased pods cannot develop normally. When cotyledons are infected at the seedling stage, dark brown lesions appear with slightly lighter edges, and after the lesions expand, cracking or sunken areas often appear; the lesions can spread from the cotyledons to the young stems, causing death of the plant parts above the diseased area. When leaves are infected, the edges are dark brown and the interior is light brown. When petioles are infected, the lesions are brown and irregular. Control methods
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How to control dodder in soybean? Detailed control methods
Soybean dodder is a malignant parasitic weed, mainly parasitizing crops or weeds in the Fabaceae, Chenopodiaceae and Asteraceae families, and it also harms peanuts, alfalfa and potatoes.1
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Control Methods for Soybean Bacterial Blight
Symptoms: It damages seedlings, leaves, petioles, stems and pods. When seedlings are infected, the cotyledons develop semicircular or nearly circular brown spots. When leaves are infected, irregular chlorotic small spots initially appear, water-soaked, and after expanding they become polygonal or irregular in shape, about 3-4mm in size, with the center of the lesion dark brown to blackish brown, surrounded by a narrow chlorotic halo ring, and after the lesions merge they form dead necrotic patches. When the stem is infected, it initially presents as dark brown water-soaked elongated strips, which after expanding become irregular and slightly sunken. When pods and seeds are infected, dark brown streaks
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How to prevent and control soybean phytophthora root rot? Detailed explanation of occurrence patterns and control methods
After soybean phytophthora root rot was introduced into our prefecture with the transfer of soybean seeds in July 2005, our station immediately established a soybean phytophthora root rot monitoring leading group and dispatched professional and technical personnel to carry out field monitoring work in Gongliu County. 1. Disease investigation In 2005, the affected area was 2239 hectares, and in 2006 the affected area was 2858 hectares. 1. Disease situation in Xinyuan County The soybean planting area was 0.67 million hectares, the investigated area was 0.3 million hectares, and the affected area was 0.23 million hectares, of which the sporadic occurrence area was 0.2
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Frost damage prevention and control methods and key technical points for Schisandra chinensis
1. Disease symptoms Frost damage of varying severity occurs every year in the Schisandra chinensis production areas of Northeast China. In mild cases, the branches and shoot tips are frozen; in severe cases, the entire plant dies. Affected leaves initially show irregular small spots, which over time merge together and develop into mottled, uneven large patches; the leaves fade, and the leaf margins dry up. In the later stages of the disease, the young tender shoots suffer severe water loss and wilting, the tissues dry out and become necrotic, the leaves dry up and fall off, and the tree vigor declines. The first factor is the influence of temperature: after Schisandra chinensis buds break in spring, the nighttime temperature sometimes drops sharply, and water vapor condenses
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