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Rice seedling-stage diseases require careful prevention and control, especially during periods of abnormal temperatures
Seedling-stage diseases are the general term for various physiological and infectious diseases during rice seedling raising, also called seedling rot. Physiological seedling rot refers to symptoms such as seed rot, bud rot, black root, greens wilt and yellow wilt death of seedlings caused by adverse environmental conditions; infectious seedling rot refers to seedling death symptoms caused by the harm of cottony leak and damping-off. During the seedling-raising period in northern rice regions, low temperatures and cold wave weather strikes are common, and the annual incidence rate of seedling rot disease is 10%~23%. Symptom characteristics 1. Physiological seedling rot: 1. Seed rot, refers to seeds rotting before germinating
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Detailed Explanation of Licorice Planting Methods and Technical Requirements
1. Selection of planting site. Under different climate and soil conditions, the yield and quality of licorice vary considerably. Licorice has strong adaptability to temperature conditions, while moisture conditions play a decisive role in licorice yield. According to the author's research, in regions of China's temperate zone with 300-500mm of precipitation, the rainfall in normal years can basically meet the growth needs of licorice, and it can be cultivated on land without irrigation conditions; however, to obtain high-quality transplant seedlings, the seedling nursery should have irrigation conditions. In areas with annual precipitation below 200mm, to obtain high quality and high yield, when there is no sufficient groundwater directly available for licorice use (groundwater level 2-3m), both the seedling nursery and the transplant site must have irrigation conditions.
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What are the sanitation requirements for raising Ussuri raccoon dogs?
General sanitation requirements 1. A lime disinfection trough made of cement must be set up at the entrance of the raccoon dog farm; if conditions permit, sunlight disinfection can be added, as ultraviolet rays have a very good killing effect on anthrax spores and Pasteurella. All personnel should enter and exit through this point, and outside visitors should be controlled. Feeding and technical staff should manage their respective raccoon dog groups, tools, feeding utensils and supplies according to their division of labor, and must not mix them up. 2. The ground of the raccoon dog farm should always be kept clean and dry. Quicklime powder should be spread on the ground of the pens once a week, and feces should be cleaned up once a day and concentrated in a fixed location
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What meteorological factors does jujube tree growth require?
Germination stage: when the daily average temperature reaches 13--14°C, germination begins; at 17°C, leaves unfold. Flowering stage: when the daily average temperature reaches 19--20°C, flower buds appear, and at 20--22°C flowering begins. During full bloom, the optimal temperature is 22--27°C and the relative humidity is 60%--70%. A relative humidity below 25% will cause a large amount of "scorched flowers" and young fruit drop. Fruit ripening stage: the optimal temperature for fruit development is 25--27°C, with relative humidity around 75%. Optimal temperature during the fruit ripening stage 1
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Rice cultivation in cold regions requires water-saving irrigation, selection of improved varieties, making the most of accumulated temperature, and growing strong seedlings
Heilongjiang Province is located in a high-cold region, where heat and water resources are relatively scarce, annual atmospheric precipitation is extremely unevenly distributed, spring is windy with little rain, and drought is quite severe. The author discusses how to achieve water-saving, high-quality, and high-yield rice cultivation in cold regions. 1. Selecting excellent varieties is the prerequisite for ensuring high-quality and high-yield rice. The varieties that rice farmers plant directly affect the quality and yield of rice. Therefore, in production, varieties with a suitable maturity period, excellent quality, stable and high yield, and strong stress resistance should be selected. First, select varieties that have passed national approval, been named, and promoted, which can ensure relatively stable rice traits, steady and rising yields, and safe and reliable use; second, introduce varieties with suitable maturity periods according to different accumulated temperature zones, and never introduce varieties across zones; third, pay attention to seed quality, and select first-grade improved seeds with a purity above 98%, a germination rate above 90%, and a moisture content no higher than 14% for production use; fourth, purchase seeds from nationally certified seed companies, research institutes, and agricultural colleges, and eliminate blind planting; fifth, in actual planting, unify varieties as much as possible, plant in contiguous fields, form scale, and achieve industrialized planting.
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A Detailed Explanation of Sheep Nutritional Requirements and Key Points of Scientific Feeding Management
1. Nutritional Requirements Goats, like other livestock, require various nutrients for their life activities, mainly including protein, carbohydrates, fats, vitamins, minerals and water. (1) Protein Protein is a nitrogen-containing compound, and its basic composition is amino acids. There are many types of amino acids, but only just over 20 kinds make up proteins. Protein is the main component of sheep body tissues and cells, and is a nutrient essential for maintaining normal life metabolism, growth, reproduction and the production of various products. By
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What temperature requirements does soybean growth have? Detailed explanation of the suitable temperature range
Soybean is a warm-season crop and has different temperature requirements at each growth and development stage. First, seed germination is very sensitive to temperature: the minimum germination temperature is 6°C, emergence is 8-10°C, and seedlings suffer slight frost damage at a low temperature of -4°C. Throughout the growth period, the optimum growth temperature for soybean is a daily average temperature of 20-25°C, among which the optimum growth temperature for seedlings is 20-21°C, the flower bud differentiation stage is 21-23°C, the flowering stage is 22-25°C, the pod-setting and seed-filling stage is 21-23°C, and the maturation stage is 19-
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What are the temperature requirements for soybean growth and development?
Soybean is a warmth-loving crop, and the accumulated temperature required by soybean varieties in Heilongjiang Province is about 1800-2700°C. (1) The optimum temperature for seed germination is 18-20°C, at which germination is fast and seedlings emerge evenly; the minimum temperature is 6-8°C, but germination is very slow; when the temperature reaches 33-36°C, germination is fastest, but the seedlings are weak. (2) The minimum temperature required for emergence is 8-10°C. (3) For flower bud differentiation, 21-23°C is more suitable. For flowering, 22-25°C is more suitable. If the temperature is too high or too low, there will be fewer flowers. (4) The suitable
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What are the soil requirements for growing soybeans?
Soybeans are not strict about soil conditions for their growth and development. Apart from swampy land and saline-alkali land, the most suitable soil for growing soybeans is deep, rich in organic matter, well drained and irrigated, with strong water-holding capacity and a pH of 6.8-7.5. As for growing soybeans on red and yellow soil in mountainous areas, as long as attention is paid to fertilizer management, increased yields can also be achieved.
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Feeding concentrate to rabbits requires care: master the scientific feeding method
Concentrates include energy-based feed ingredients such as corn, barley, wheat, sorghum, wheat bran and fine rice bran, as well as feed ingredients with high protein content such as soybean meal, rapeseed cake, fish meal, silkworm pupae and blood meal. Their common characteristics are low crude fiber content, low moisture content and high nutritional value. To increase the weight gain rate of meat rabbits, make wool rabbits produce more wool and rex rabbits produce more high-grade fur, concentrates are indispensable. The principle for using concentrates is to follow the nutritional needs of different types of rabbits and, according to the different regions and different
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