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Practical technical points for heatstroke prevention and cooling in summer chicken raising
The most suitable temperature for laying hen production is 17°C to 28°C, and the temperature range with little effect on production is roughly 7°C to 27°C. When summer temperatures in Shandong generally exceed 35°C, chickens will faint, and when they reach 40°C, chickens will die. Experiments have shown that when the temperature inside the chicken house reaches above 30°C, rooster sperm decreases, hen sexual maturity is delayed, the fertilization rate drops by 60%, and laying by laying hens generally declines. At the same time, due to a drop in blood calcium and an imbalance in acid-base balance, other diseases are easily induced, such as E. coli and mycoplasma disease. Because broiler chickens are large in body size, prone to fat
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Technical key points for raising growing pigs well in summer and autumn
Piglets are weaned at 3-6 weeks of age and kept in the nursery house for 4 weeks. When body weight is 20-50 kg, because bone and muscle growth is relatively fast, they are called growing pigs. At this stage, the protein level is 16% and the lysine content is 0.8%. At 50-110 kg, adipose tissue is deposited in large amounts, so the protein and lysine levels can be appropriately reduced to 14% and 0.65% respectively. Ordinary pig farmers are accustomed to using concentrate or premix combined with corn, bran and other raw materials for feeding, but attention should be paid to the fact that the premix produced by some manufacturers is not up to standard, resulting in pigs
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How to Raise Adult Turtles? Detailed Explanation of Feeding Methods and Technical Key Points
The area of an adult turtle pond should preferably be 100 sq m, and about 10 juvenile turtles can be stocked per sq m. The pond water for adult turtles should be kept light green (transparency of about 30 cm). If the transparency is too high, the turtles will feel insecure; if the transparency is too low, the water will be brownish green, the water quality will be too fertile, and it will easily cause eutrophication, which is also bad for raising turtles. The feeding method for adult turtles varies by season. In spring and autumn, when the water temperature is low, adult turtles do not come out much in the early morning or evening, so they should be fed at 10 a.m.; in midsummer
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How Is Rice Bred? A Detailed Explanation of Methods and Technical Key Points
In the process of hybrid rice breeding, the sterility of the rice male sterile line is affected by photoperiod-sensitive factors. The male sterile line generally shows sterility under the long daylight of April to September, while it shows fertility under the short daylight of September to April of the following year. Therefore, "two-line hybrid rice breeding" can increase yield by more than 20% compared with "three-line hybrid rice breeding", and it also overcomes the problems of a single source of male sterile cytoplasm and the relatively large limitation in the use of heterosis. The gene compatibility between indica and japonica subspecies is determined by their compatibility substances.
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What are the key technical points for field tillage and preparation for machine-transplanted rice?
For machine-transplanted rice fields, different tillage and preparation methods should be adopted according to the cropping sequence, soil characteristics and other conditions, and base fertilizer should be applied according to local conditions based on soil fertility. Tillage and preparation of fields following a previous crop: 1. Crushing the straw of the previous crop. When the previous crop is harvested, the straw must be crushed and evenly spread. If crushing was not carried out during mechanical harvesting, an additional straw-crushing operation should be added or the straw should be removed from the field. 2. Dry tillage. Under suitable soil moisture and water content conditions, three methods can be used to kill stubble: forward (reverse) rotary tillage, shallow plowing and harrowing of stubble, among which the reverse rotary stubble-killing method
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Methods for preventing and controlling rice seedling stunting and key technical points
The main causes of rice seedling stunting are three types: phosphorus deficiency stunting, zinc deficiency stunting, and saline-alkali damage stunting. The main prevention and control methods are: 1. Phosphorus deficiency stunting generally occurs during 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, partial tillering, red leaf tips, and old leaves turning brownish-red or even dying. The main causes are (1) soil lacking available phosphorus; (2) low soil temperature, low water temperature, or soil containing hydrogen sulfide, ferrous iron
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Cold damage prevention and control methods and key technical points for rice at the panicle elongation stage
Rice pollination at the panicle elongation stage greatly needs temperature and oxygen. During this period, cold winds blowing from the northeast are very likely to occur, causing poor pollination, empty and shriveled grains, and reduced yield. Prevention and control techniques for cold damage. First, accelerate rice pollination. From late July to early and mid-August, due to meteorological causes of atmospheric circulation, the temperature generally drops to around 17, causing rice flowers to remain closed and not open, affecting rice pollination and producing empty and shriveled grains. For this kind of obstructive cold damage, scientific management of the paddy field should be strengthened so that rice accelerates through the pollination period and avoids
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Detailed Explanation of Key Technical Points for Soil Testing and Formulated Fertilization in Rice
I. Fertilization Principles 1. Soil testing and formulated fertilization for rice should follow the principles of determining yield target based on soil, determining fertilizer rate based on yield target, supplementing deficient nutrients, combining organic and inorganic fertilizers, and balanced application of nitrogen, phosphorus and potassium. First, soil testing is required. Soil testing is the prerequisite for soil testing and formulated fertilization; through analysis and determination of soil nutrients, the soil nutrient status and fertilizer supply capacity can be accurately grasped, providing a scientific basis for formulated fertilization. Second, a good formula must be prepared. The formula is the key to fertilization. On the basis of soil testing, according to soil characteristics, cultivation practices, crop nutrient requirements, production level and climate conditions,
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Key Technical Points of Soil Testing and Formula Fertilization for Rice
Based on the technical principles of soil testing and formula fertilization, and combined with the actual work of soil testing and formula fertilization in Pulandian City, 10 technical steps in the experimental process of soil testing and formula fertilization for rice were summarized. 1. Site selection: Select locally representative plots, and arrange experimental plots according to the areas of high-, medium-, and low-fertility farmland. The fertility status of the experimental site should be uniform and consistent, and the fertilization status of the previous crop should be as similar as possible. 2. Soil sampling and testing: Collect soil samples before plowing, using a "plum blossom shape" or "snake shape" to take 15-20 points, with a vertical depth of
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Key Technical Points for Integrated Control of Rice Diseases, Insect Pests, Weeds and Rodents
1. Suitable areas: all rice-growing areas in Guangdong Province. The rodent control technology is suitable for controlling house mice in agriculture, forestry, livestock and poultry farming, and urban areas of Guangdong Province. 2. Key technical points for rice disease and insect pest control: (1) Agricultural control: A. Select disease- and insect-resistant, high-yielding, high-quality varieties. B. Sow and transplant at the appropriate time. C. Rational close planting and fertilization. For seedling throwing, 40 trays per mu (560 holes) is appropriate; for transplanted fields, about 20,000 hills per mu (6X5 cun), that is, about 80,000-100,000 seedlings, is appropriate. For basal fertilizer, it is recommended to apply more organic fertilizer; according to soil fertility and yield, apply an appropriate amount of nitrogen fertilizer in the early and middle stages (about 10 kg of pure nitrogen per mu), and increase the application of phosphorus and potassium fertilizers.
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