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Methods and Technical Key Points for Controlling the White-Backed Planthopper in Rice
Damage symptoms: Adults and nymphs gather in colonies at the base of rice plants and pierce and suck the sap, causing the leaf tips of rice leaves to lose green and turn yellow, and in severe cases the whole plant withers and dies. Damage during the heading stage can also cause difficulty in heading, blighted panicles, or browning of the panicles, along with many empty grains and other damage symptoms. Morphological characteristics: Adults have two forms, the long-winged type and the short-winged type. The long-winged adult is 4-5 mm long, grayish yellow, with a rather narrow vertex projecting in front of the compound eyes; the face has 3 raised longitudinal ridges, with the ridges light in color and the grooves dark, black and white sharply distinct; in the center of the scutellum on the thoracic dorsum grows a pentagonal white or bluish-white spot; in females the
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Detailed Explanation of Key Technical Points for Late-Stage Management of Rice in the Main Field
I. Water-Saving Irrigation Techniques During the rice growth period, water-saving techniques should be adopted for irrigation, with irrigation and drainage carried out according to the water requirements and characteristics of rice at each growth stage. These are mainly divided into deep-water greening, shallow-water tillering, deep-water booting and heading, and shallow-water ripening. During the greening stage, because the roots of the seedlings are damaged during transplanting and absorb little water while leaf transpiration is high, deep-water greening must be applied after transplanting to prevent physiological water loss, with a water depth of about 2-3 cm being appropriate. If the irrigation water is too deep, nutrient decomposition is slow, which is unfavorable for tillering; the booting and heading stage is the period of the greatest water demand in the entire life of rice
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Technical Guidance on Chemical Weed Control in Paddy Fields
Chemical weed control in paddy fields is a key step in achieving high and stable rice yields. There are three main types of weeds in the rice fields of our county: grassy weeds such as barnyardgrass, sprangletop, and crabgrass; broadleaf weeds such as monochoria, pondweed, and Rotala indica; and sedge family weeds. In recent years, because rice planting methods in our county have become diverse, the weed spectrum in paddy fields has undergone considerable change: first, some malignant weeds in paddy fields are on the rise. In addition to barnyardgrass, which remains widespread and abundant, sprangletop and Cyperus serotinus have shown a clear upward trend;
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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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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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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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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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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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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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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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