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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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Detailed Explanation of Common Rice Diseases and Their Control Methods
Throughout the entire growth period of rice, common diseases include rice blast, bacterial leaf streak, bacterial leaf blight, sheath blight, rice false smut, and others. (1) Rice blast: It can occur from the seedling stage to the heading stage. According to the symptoms shown at different growth stages and on different parts of the plant, it can be divided into 5 types: seedling blast, leaf blast, node blast, panicle blast, and grain blast. 1. Main symptoms (1) Seedling blast: The diseased seedling turns grayish-black at the stem base near the soil surface, and the upper part turns light reddish-brown, causing the entire seedling to curl and die. (2) Leaf blast: On
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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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How to Prevent and Treat Yellowing of Rice Seedlings? A Detailed Guide to Practical Methods
During rice seedling raising, yellowing of seedlings is very likely to occur, with slow tillering and weak growth, which is not conducive to cultivating strong seedlings and has a serious impact on the seedlings used for field production and even on the improvement of rice yield. I. Yellowing caused by insufficient base fertilizer. Before the three-leaf stage, seedling growth mainly depends on the endosperm; after the three-leaf stage, it mainly depends on nutrients absorbed from the soil by the root system. However, many people believe that rice seedlings are small during the seedling-raising period and do not need much fertilizer, so insufficient base fertilizer is applied, and nitrogen deficiency becomes the main cause of seedling yellowing. Countermeasure: Apply 60-75 kg of urea per hectare of seedling field,
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What are the control methods for the rice water-dropwort grasshopper?
Scientific name Gesonula punctifrons (Stal), belonging to Orthoptera, Acridoidea. It is distributed in Jiangsu, Zhejiang, Jiangxi, Fujian, Guangdong, Guangxi, Taiwan, China, Sichuan, Yunnan and other provinces and regions. Its hosts include rice, taro, lotus root, wild narcissus, sugarcane, corn and other plants. Damage characteristics: adults and nymphs chew leaves into notches or eat the leaf mesophyll leaving the epidermis; damaged leaves show small purple transverse spots, affecting photosynthesis and hindering plant growth. Morphological characteristics: female adult body length 19-22 mm, male adult
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Detailed Methods for Controlling the Chinese Rice Grasshopper in Rice
Scientific name Oxya chinensis (Thunberg), belonging to the order Orthoptera, family Acrididae. It is distributed across the rice-growing regions of both northern and southern China. Its host plants include rice, wild rice stem (Zizania latifolia), and other grasses, as well as various plants in the Fabaceae, Convolvulaceae, Malvaceae, and Solanaceae families. Damage characteristics: adults and nymphs feed on leaves, causing notches; in severe cases the entire leaf is eaten away, leaving only the veins. Morphological features: adult male body length 15-33 mm, female 19-40 mm, yellow-green, brown-green, or green; the front margin of the forewing is green, the rest light brown; head is broad and large, oval; the vertex
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Key Points of Rice Seedling Cultivation Technology: How to Grow High-Yield Seedlings
Rice is the main food crop in the lakeside lowlands of southern Shandong and southwestern Shandong, with high yield and strong marketability. However, in recent years, mixed varieties and severe diseases have affected the income of farmers in rice-growing areas. Therefore, all rice seedling cultivation techniques must be properly implemented to lay a solid foundation for a bumper rice harvest. 1. Select high-quality varieties. Although Yujing No. 6 rice has relatively poor disease resistance, it has excellent quality, strong photosynthetic efficiency and compensatory capacity, and good yield potential, so it should still be the main variety this year. Lindao 11 and Zhendao 88 can be planted in combination, and Shengdao 80 can be planted for demonstration.
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How to tell if rice is deficient in zinc? Look for these typical symptoms
Zinc deficiency in rice generally occurs at the seedling stage. The symptoms are chlorosis and whitening at the base of new leaves, small and narrow leaf blades, sometimes whitening of the central leaf as well, chlorotic yellowing or whitening stripes on old leaves, and brown streaks on both sides of the midrib. Plants are stunted, the distance between leaf collars is shortened, tillering is reduced or delayed until no tillering occurs, the root system is weak with few white roots, the rate of floret sterility increases, heading is delayed or does not occur at all, and maturity is postponed.
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Correct methods for using rice-specific compound fertilizer
Rice-specific compound fertilizer is a medium-concentration compound fertilizer developed according to the patterns of nitrogen, phosphorus, and potassium requirements of rice after transplanting, and it is most suitable for use as a basal fertilizer in rice transplanting fields. It has the characteristics of "low cost," "convenient use," "fast greening-up," and "good safety." After use, it can enhance crops' resistance to lodging, pests, and diseases, with obvious effects in increasing yield and income. Methods of use: as a basal fertilizer for rice, the dosage is generally 25 kg/mu, and no other chemical fertilizers need to be applied. After fertilization, rice seedlings can be transplanted immediately without
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Methods for Extending Rice Seedling Age and Key Points for Preparing to Transplant Rice While Waiting for Rain as a Drought-Resistance Measure
In a normal year, the seedling age for machine-transplanted rice is about 30 days, about 40 days for seedling-throwing rice, and about 50 days for water-raised seedlings. If the water for transplanting comes late, the seedling age must be extended to more than 60 days in order to wait for water before transplanting. First, sow sparsely to cultivate strong seedlings of extended age. That is, by expanding the area of the seedling-raising bed and reducing the sowing rate per square meter, the tillering-stagnation period of the seedlings is prolonged, which can effectively increase the seedling-age flexibility of seedlings sown early at the proper time and improve seedling quality; this can both raise per-unit yield and resolve the contradiction of having no water for transplanting in the early period.
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