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What causes rice seedlings to sit and bunch up?
After the transplanted rice was thrown and planted in the main spring season this year, many farmers came to me and said: "Their seedlings have been thrown and planted for more than ten days, why are they growing shorter and smaller the more they grow?" Our agricultural technology station investigated the seedling growth situation across the whole township, and finally found the causes of the seedlings growing shorter and smaller the more they grow, mainly: 1. Herbicides were used in a mixed and messy way, for example: after using the "Yelao" herbicide, the water flooded too deep, no new heart leaves grew, and some applied "Qiangxin" weeding fertilizer, etc., which inhibited rice growth and caused the seedlings to grow shorter and smaller the more they grow. 2. In muddy fields, rice lacks zinc,
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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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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 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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What are the advanced methods for transplanting rice seedlings?
1. Improved intensive cultivation: transplant young seedlings at the 3-leaf to 4-leaf 1-heart stage early. Fields with good water sources should be planted early; fields with poor water sources can be planted slightly later. Both dry-raised and water-raised seedlings are suitable, but sufficient base fertilizer should be applied, the field should be deeply plowed and harrowed level, strong seedlings should be selected as much as possible, and transplanting should be done in shallow water; both the row spacing and hill spacing are 1 chi 3 cun, with three single plants per hill spaced 3 cun apart in a triangular arrangement. This transplanting method has density within sparseness and sparseness within density, minimizing competition among plants for nutrients and sunlight to the greatest extent, which benefits individual plant development and can therefore increase yield considerably. It is the most advocated
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How should rice seedling beds be managed to cultivate strong seedlings?
I. Water management in seedling beds: For dry-raised seedlings, generally no supplemental water is needed during the seedling stage. Adhere to dry raising and dry management to improve the drought tolerance of the seedlings. At the same time, pay attention to watering well three times: water thoroughly with "bottom moisture water" before sowing, water well with "film-removal water" when removing the film, and water well with "leaf-rolling water" during drought. At the 1-2 leaf stage, control water appropriately to promote downward growth of seminal roots; at the 2-3 leaf stage, pay attention to supplemental water to prevent seedling death; after the 3-4 leaf stage, strictly control water and use dry raising to cultivate physiologically strong seedlings. To prevent excessive rainwater from making dry raising and dry management impossible, small arched sheds or greenhouses can be used to strictly control water for dry raising.
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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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Shallow water warming for rice to promote tillering, fertilization with "two preventions" to grow strong seedlings
Due to the impact of unfavorable weather conditions such as low temperatures, frequent rain and insufficient sunlight, rice has been slow to turn green, with yellow leaves, few tillers and delayed growth. For this reason, rice expert Xu Yirong, after an on-site inspection in the Heilongjiang reclamation area, proposed countermeasures such as shallow water warming to promote tillering, fertilization with "two preventions" to grow strong seedlings, and fitness-based disease prevention. First, water layer management must be done well: deep water is a heat-preservation measure, shallow water is a warming measure, and not establishing a water layer is a cooling measure. For plots with deep water formed by rainfall, drainage must be carried out promptly to raise temperature, promote root growth and promote
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What are the reasons why rice seedlings are slow to tiller?
1. Rice bakanae disease: Disease pattern and transmission routes: The pathogen of rice bakanae disease overwinters on grains and rice straw. The following year, when diseased seeds or straw are used, the pathogen multiplies as the seeds germinate, invading through the seedling coleoptile or wounds, causing the seedlings to develop the disease and become leggy. Diseased seedlings often wither and die. Diseased seedlings that do not die are pale yellow-green, grow thin and elongated, generally about one-third taller than healthy seedlings; their roots develop poorly, with few tillers or even no tillering. After diseased seedlings are transplanted, they carry the pathogen to the field, causing rice plants to develop the disease. When rice heads and flowers
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Rice seedling raising is key: good seedlings mean half the rice is already grown, and strong seedlings lead to high yields.
Seedling-stage management for machine transplanting is key. Cultivating robust seedlings suitable for machine transplanting is the key to the success of promoting mechanized rice transplanting. "Good seedlings mean half the rice is grown, and strong seedlings lead to high yields." The quality of the seedlings plays an important role in the number of panicles, number of grains and grain weight in the later growth stages of rice. The basic requirements of mechanized transplanting for seedlings are overall uniformity and individual robustness, requiring that "a tray of seedlings has no tall and short ones, and a handful of seedlings has no thick and thin ones." High temperature and high humidity promote uniform emergence. Germinated rice seeds, after sowing, need to go through a period of high temperature and high humidity for seedling establishment.
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