What are the conditions of tobacco deficiency?

What are the conditions of tobacco deficiency? How to control tobacco needs to absorb a variety of nutrients in the process of growth and development. Due to nitrogen deficiency, the lower leaves of tobacco plants gradually turned yellow and dry, and the leaves were small, white and dull, and the tissue was inelastic and brittle. Prevention and remedial measures: promote the application of compost made by enzyme bacteria or fully mature organic fertilizer, mix in cake fertilizer if necessary, and cooperate with watering to reduce the degree of damage, or 10-13 kg ammonium nitrate per mu. Lack of phosphorus, the growth of tobacco plant is slow, the aboveground part is rosy, the leaf is small, narrow and long, the leaf is ferruginous, the lower leaf appears brown spot, seriously extends to the upper leaf, when phosphorus deficiency, the leaf is generally immature and the color is not fresh. Remedial measures: when phosphorus deficiency is found, phosphate fertilizer is mixed between rows or applied once before transplanting; in the middle and later stage of phosphorus deficiency, 1%-2% superphosphate leaching solution is sprayed on the leaf. Due to potassium deficiency, the leaf tip of the lower leaf first turns yellow, then extends to the leaf margin and veins, and begins to die from the leaf edge. Although the tissue around the leaf stops growing, it is still growing inside, causing the leaf to curl downward. Preventive and remedial measures: 200 kg of plant ash or 10 kg of potassium sulfate per mu according to actual needs, and foliar spraying with 2% potassium dihydrogen phosphate solution or 2.5% potassium sulfate solution if necessary. Lack of calcium, the plant is dark green at the initial stage, the growth point stops growing at the later stage, the terminal bud dies, the bud from the side is deformed, the expanded leaf becomes brittle, the leaf margin turns green, the root turns black, and the fibrous root growth stagnates. Remedial measures: if calcium deficiency is found, 0.2%-0.5% tobacco special compound fertilizer or 1%-2% superphosphate leaching solution can be sprayed on the leaf. Due to magnesium deficiency, the tip of the lower leaf and the surrounding veins began to turn green, yellowed, and then whiten. The part close to the vein turned almost white, but the rest remained green. Remedial measures: magnesium deficiency can be found by foliar spraying with 0.2%-0.5% magnesium sulfate solution. Sulfur deficiency, symptoms are similar to nitrogen deficiency, tobacco plants show yellowing phenomenon, but when the sulfur content in tobacco plants is less than 0.1%, the growth is slow, the whole plant is light green, the young leaves are the lightest, and the old leaves are not dry. These symptoms are different from nitrogen deficiency. Prevention and remedial measures: when sulfur is deficient, 6-9 kg of gypsum or 2 kg of sulfur can be applied per mu. In addition, the application of calcium superphosphate can also meet its need for sulfur. In the absence of iron, the young leaves lose chlorosis at first, the veins of the young leaves at the top become light green to nearly white, when the iron deficiency is serious, the veins fade and the whole leaves turn white. Remedial measures: when iron deficiency is found, foliar spray of 0.1%-0.2% ferrous sulfate solution is used in time. In the early stage of boron deficiency, the apical bud leaves and growth points were abnormal, the young leaves were light green, the base became gray-white, and the terminal bud leaves died in the later stage, even if they did not die. Remedial measures: when boron deficiency is found, foliar spraying with 0.1% borax solution is timely. Due to manganese deficiency, the young leaves faded in the early stage, the veins changed from light green to white, and some leaves showed necrotic spots. Remedial measures: when manganese deficiency is found, foliar spraying with 0.05%-0.1% manganese sulfate solution is timely. Due to copper deficiency, the upper leaves were dark green, curled or permanently withered and could not be recovered. Remedial measures: when copper deficiency is found, foliar spray of 0.1%-0.2% copper sulfate solution is used in time. Due to zinc deficiency, light yellow stripes appeared between the veins of the lower leaves at the initial stage, then gradually albino and necrotic, the color of the upper new leaves was light to white, the internodes of tobacco plants shortened and became shorter, and the dead parts were immersed in water. Prevention and remedial measures: zinc deficiency plots can apply 1.2 kg of zinc sulfate per mu; zinc deficiency during the growing period can be foliar sprayed with 0.5% zinc diamine tetraacetate solution. If zinc sulfate is sprayed, it is best to add a small amount of 20% hydrated lime to adjust the pH value to avoid drug damage. Lack of molybdenum, the whole plant leaves withered or curled, with wavy wrinkles, the loss of green leaves was gray-white, the lower leaves showed irregular necrotic spots, the disease spots were gray-white at first, and then turned brown-red. Remedial measures: when molybdenum deficiency is found, foliar spray of 0.02%-0.1% ammonium molybdate solution is used in time. Click to get more tobacco planting techniques click to get more flower planting techniques