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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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How to use paclobutrazol and uniconazole for raising strong rice seedlings
Paclobutrazol and uniconazole are both plant growth regulators. When applied in rice seedling raising, they have good effects on controlling growth and promoting tillering, preventing seedling stiffness and seedling rot, and increasing panicles, grains and yield. The method for using paclobutrazol is: when the seedlings have one leaf and one heart, evenly spray 100 kg of paclobutrazol solution at a concentration of 300 ppm per mu of seedling field, ensuring no missed spraying and no repeated spraying. When spraying, drain the water from the seedling field and keep the field surface free of standing water. The method for using uniconazole is: soak the seeds with uniconazole solution at a concentration of 50-200 ppm for 24-48 hours, with a ratio of seeds to chemical of 1:1.2-1.5. During soaking, stir 3-4 times so that the seeds absorb the chemical evenly. After soaking, rinse with clean water before sprouting. For seeds treated by soaking with uniconazole, soak and sprout 1 day earlier than conventional practice.
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How to fertilize rice? Mastering scientific fertilization methods is key
Use organic fertilizer together with chemical fertilizer. Organic fertilizer is rich in organic matter, can build up soil fertility, provide a variety of nutrients, and also supply compounds with auxin- and hormone-like properties. Applying organic fertilizer helps maintain the nitrogen reserves in rice paddy soil. Organic fertilizer releases nutrients slowly, while chemical fertilizers are mostly quick-acting fertilizers that supply nutrients rapidly; using the two together makes the nutrient supply relatively steady. The organic acids and humic acids in organic fertilizer can bind with iron and aluminum in the soil, reducing the fixation of phosphate fertilizer by the soil and increasing the amount of available phosphorus and the
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Detailed Explanation of Rice Paddy Soil Types and Nutrient Status in Sanming City
Our city has relatively abundant land resources, with a total land area of 34.44 million mu, of which cultivated land area is 2,563,100 mu, accounting for 7.4% of the total land area (of which paddy field area is 2,441,900 mu, accounting for 7.1% of the total land area, and agricultural land is 121,200 mu, accounting for 0.3% of the total land area). Due to differences in distribution terrain, paddy soils can be divided into four types: plain fields, sloping terraced fields, mountain valley fields, and streamside fields, with a ratio of 4.6:5:6.2:1 among them. Plain fields are dominated by hydromorphic
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Sanxiangyou 714 rice variety (formerly known as 316a/y0714)
Variety source: Sanxiang A (316AA) × y0714. Characteristics: This variety is an indica three-line hybrid rice. When grown as a double-cropping late rice in the middle and lower reaches of the Yangtze River, the average whole growth period is 123.9 days, 2.7 days later than the control Shanyou 46. Plant height is 111.1 cm; the plants are tall and grow vigorously, with average uniformity. The number of effective panicles per mu is 181,000; panicle length is 24.7 cm; total grains per panicle is 123.4; seed setting rate is 76%; and 1000-grain weight is 30.1 g. Average resistance performance over two years: rice blast grade 9,
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Detailed Introduction to the Shanxizhan 11 Rice Variety
Breeding institution: Foshan Institute of Agricultural Sciences, Guangdong Province. Approval status: Approved by the National Crop Variety Approval Committee. Variety approval number: Guoshendao 990014. Variety origin: Shanxizhan 175 / Xianhuangzhan 8. Characteristics: A temperature-sensitive indica rice. Plant height 97.6-104.4 cm, erect plant type, relatively strong tillering, cold-tolerant, good grain color at late stage. Average total grains per panicle 167.4, seed-setting rate 82%, 1000-grain weight 20.5 g, grains slender, rice grains crystal clear, trans
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Introduction to the Characteristics and Traits of the Shanyou 10 Rice Variety
Breeding institutions: China National Rice Research Institute and the Taizhou Prefecture Agricultural Science Research Institute of Zhejiang Province. Approval status: approved by the Zhejiang Provincial Crop Variety Approval Committee and by the National Crop Variety Approval Committee in 1991. Variety registration number: GS01012-1990. Variety source: Zhenshan 97A x Miyang 46. Characteristics and traits: a medium-maturity indica hybrid rice combination. Plant height 88-95 cm, compact plant type, sturdy whole stalk, 15-16 leaves on the main stem, 210,000-220,000 effective panicles per mu, 1 total grains per panicle
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Detailed Introduction to the Shanyou 122 Rice Variety
[Basic Information] Shanyou 122 is a temperature-sensitive, medium-late maturing hybrid combination developed by crossing the newly bred high-quality restorer line Guanghui 122 (Lian 836-1 Minghui 63/Guanghui 3550) with Zhenshan 97A. It has accumulated a promotion area of 76,900 hm2 in our province, becoming the leading medium-late maturing hybrid rice combination in our province. [Characteristics] When grown as early rice, the whole growth period is 122-128 d, 6 d later than the medium-maturing control variety Shanyou 96 and 5 d earlier than the late-maturing control variety Shanyou 63.
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