Treating Rice Seedlings with Prescriptions
Rice seedlings, also known as seedlings, refer to the obstruction of the roots of the seedlings after rice is transplanted, the slow emergence of leaves and tillers, the stagnation of growth, the clustering of rice plants, and the phenomenon of dark green leaves or red-brown spots. There are many reasons for the emergence of “stuck seedlings†in rice seedlings. It should be based on a comprehensive judgment of the plant's appearance and growth, and after the diagnosis of the cause of the “freezing seedlingsâ€, the prevention and treatment of “diseases†can achieve good results. 1, zinc deficiency seedlings. Symptoms caused by zinc deficiency in rice appeared within 2-4 weeks after transplanting, with a high incidence of about 20 days. The base of the new leaves of rice seedlings is chlorogenic and white, and the old leaves are brown patches along the veins on both sides, or have irregular brown spots. The tip of the lower full leaf is dry, the newly extracted leaves are short and narrow, the leaves are slow, and the plants are dwarfed. The farmers call it "shrinking seedlings." Prevention measures: When the seedlings occur, the use of zinc sulphate 1 -2 kg of soil mix evenly in the fields. Or mu with 0.2% of zinc sulfate solution 50-70 kg evenly spray, spray 7-10 days before spraying once, spray time should be sunny morning or afternoon. 2, potassium deficiency seedlings. The weak seedlings caused by potassium deficiency in rice usually appear after the rice plants return to green, and peak in 20-30 days after transplanting. The main symptoms are: stagnant growth, short plants, dark green leaves, and fewer tillers. The lower leaves of the plant gradually appeared yellow-brown to auburn spots from the tips of the leaves to the leaf base, and were evenly streaked. Severely, the leaves from the bottom up appear the symptoms of leaf margin rupture and die; Prevention methods: potassium supplement, potash fertilizer suitable for paddy field use potassium chloride is excellent, potassium deficiency plots with potassium chloride or potassium sulfate 10- 20 kg, or 200 kg of plant ash. 3, phosphorus deficiency seedlings. Symptoms of rice deficiency caused by phosphorus deficiency are new leaves dark green, lower leaves reddish purple, small and erect leaves, leaf sheath long and leaves short. Rice seedlings have fewer tillers, less brown roots, and no white roots; prevention and control measures: General rice uses calcium phosphate or calcium magnesium phosphate fertilizer, and the phosphorus fertilizer should be applied to soil roots to obtain the location. The phosphorus-deficient field can be used with 30-50 kg of superphosphate or calcium magnesium phosphate, or 7-10 kg of diammonium phosphate or 2% of superphosphate solution sprayed on the leaves for 2 days at intervals of 7 days. 4, poisoning and freezing seedlings. After the rice is planted, it will not return to green for a long time, it will turn green and slow, and the tillers will be late. The appearance of the seedlings will become shorter, the leaves will turn yellow, the rice plants will not grow clumps, and the growth will stagnate. The dark brown roots will be accompanied by a large number of dark roots and deformed roots, and the white roots will be fine. The soil is black and there is odor; Prevention methods: First carry out the deep-water hydrazine to discharge the toxic substances in the soil, then use the flowing water to cleanse the poison and detoxify the soil, drain the soil properly, make the soil breathable, warm, and oxidize the toxic reducing substances. Supplement phosphorus and potash fertilizers to increase hair rooting and stress resistance. After symptoms are relieved, quick-acting nitrogen fertilizers can be used to promote rapid seedling growth. 5, soaked in soil. Common in long-term flooding, plowing layer of soil, deep mud feet, deep feet, cold-water immersed fields, as well as plowed rake over the new open field dryland. Because the plough layer is rotten, the seedlings are planted with floating mud, which can reach a depth of more than 10 cm. The underground section is extended and the root position is shifted upwards. This causes the planting pods to return to green and slow. The prevention and control measures are as follows: Combination of light fielding, timely drainage of dried land, increased soil permeability, increased temperature and oxygen, and accelerated soil environmental renewal. 6, cold damage and seedlings. After the seedlings are transplanted, if they encounter cold weather (cold flooding or low temperature and rainy weather), soil cooling (cold soaking, deep footing, muddy fields and Yinshan, Jiagoutian), water cooling (irrigation water cooling or cold soaking in the field), the growth of the seedlings is slow, Yellow-brown roots are numerous, new roots are thin and small, and the tips of needles have brown needle-like spots or dryness. In severe cases, the phenomenon of "knotty white" or "knotty yellow" appears; prevention and control measures: timely drainage of open fields, water temperature adjustment , Insulation with water, sun and night irrigation, increase water temperature and soil temperature. 7, drug hazards. The development and growth of the seedling root system is not normal, and it is easy to form the “chicken claw rootâ€. The rice plant leaf color becomes lighter, the leaves are yellow, and there is very little tillering, and the rice plant shrinks. The main reasons for this are the continuous use of iodide urea, chloriduron, and their combination herbicides in winter and field fields and former barley fields, which increases soil pesticide residues; prevention and control methods: prevention is mainly to prevent or reduce sulfonylurea. The use of herbicides of genus, Magnolia, Huanglong and its combination. Immediately after the occurrence of the deadly seedlings, drain water, and then wash the fields with water to minimize the residual amount of sulfonylureas, chlorpyrifos and their combined herbicides in the soil. 8, pests and diseases. It was mainly due to the fact that rice leaf rice blast and rice thrips were not able to prevent and control timely in the field stage, resulting in aggravated plant growth and stagnation of rice plants and delayed growth of tillering in severe plant diseases and pests. "Qinxintang"; Prevention and control measures: 20% triterpene WP for rice blast disease 100g or 75% tricyclazole 50g or 40% rice bran (Fuji No. 1), EC 60-70 ml watered 50 - 60 kg spray, heavy field spray 2 times, interval 7-10 days. Indica rice can use 40% of omethoate emulsion 75-100 ml or 20% of triazophos emulsion 75 ml/mu, spray 50 kg of water spray, or 25% of double insecticide 200-250 g, water 50 Kilogram spray control. In addition, for the rice fields with severely stiff seedlings, growth regulators such as squiggly seedlings and stiff seedlings can also be used to adjust the physiological activity of plants and promote the rapid recovery of growth.
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