Tobacco is an important economic crop. In the tobacco-producing areas of our province, tobacco farmers often treat the deficiency as a disease because they cannot be judged correctly, which may delay the production season and cause unnecessary losses.
The early symptoms of nitrogen deficiency are pale leaves, slow growth or stop growing. The lower old leaves turn dark brown or yellowish and gradually dry out. Other leaves are erect or have a smaller angle to the stalk. It can apply 15-20 kg of ternary compound fertilizer per acre when cultivating soil, and it can not be applied more, so as not to affect the quality of tobacco leaves.
Phosphorus deficiency often occurs in the first month after transplanting seedlings, showing slow growth, short plantlets, dark green and purple leaves, narrow and upturned leaves, small white spots on the lower leaves, dark brown after roasting Or cyan, lack of luster, poor quality. Foliar application of phosphate fertilizer should occur when this symptom occurs.
The potassium-deficient leaves are rough and wrinkled and drooping, the leaf margins are curled, spots appear, the center of the spots is necrotic, and the holes are pierced. Generally, the application of nitrogen fertilizer is too heavy, which will aggravate the symptoms of potassium deficiency. The amount of nitrogen fertilizer should be controlled, and the potassium fertilizer should be applied in time. In the middle and late stages, potassium dihydrogen phosphate can be sprayed on the foliar surface.
Magnesium deficiency is generally prone to magnesium deficiency in sandy loam and rainy seasons. It shows that the leaf margin and the veins are chlorotic from the bottom to the top, and the lower part is white, but generally does not die dry, which can be distinguished from the symptoms of potassium deficiency. Once the symptoms are found, the magnesium sulfate should be applied in time.
In the absence of calcium, the leaves are light green, then the tip of the young buds is bent down, and the tips and edges of the young leaves gradually die. Calcium is weak in the body of tobacco and rarely transfers from the old leaves to the young leaves. Therefore, calcium should be supplied in time throughout the tobacco growth period.
The young leaves of boron-deficient buds are light green, the stems become grayish white, the leaves basically stop growing, and the base tissues of young leaves are ulcerated. For the tobacco used for seeding, if the flower is deficient in boron, the top of the flower will wither and fall off, and it will not be strong or firm. It should be sprayed with a certain concentration of borax in time to supplement it.
Sulfur deficiency mainly occurs in the early or dry season, the plant turns pale green, the upper leaf color is lighter than the lower leaf color, the lower old leaves are not scorched like nitrogen deficiency, the tip of the leaf tends to curl down, and the leaf has protrusions. Bubble point. Symptoms usually disappear after the rain.
The leaves in the lower part of the zinc-deficient tobacco appear to fade at the edge of the tip, and then die or smash. The dead part began to be water-stained, and then expanded to accelerate, and finally turned reddish brown and dry. Each mu can be sprayed with 100-120 kg of zinc sulfate solution from 0. 1% to 0.5%.
The upper leaves of the copper-deficient plants are withered and cannot be recovered. In the flowering period, copper is scarce, and the main stem of the tobacco plant cannot stand upright. It is advisable to spray 0.1%-0.2% copper sulphate solution in time, and spray 100-150 kg per acre.
(Zhuo Jinliang, Zoufang Tobacco Development Zone, Renju Town, Pingyuan County)
From: Southern Rural Newspaper
The early symptoms of nitrogen deficiency are pale leaves, slow growth or stop growing. The lower old leaves turn dark brown or yellowish and gradually dry out. Other leaves are erect or have a smaller angle to the stalk. It can apply 15-20 kg of ternary compound fertilizer per acre when cultivating soil, and it can not be applied more, so as not to affect the quality of tobacco leaves.
Phosphorus deficiency often occurs in the first month after transplanting seedlings, showing slow growth, short plantlets, dark green and purple leaves, narrow and upturned leaves, small white spots on the lower leaves, dark brown after roasting Or cyan, lack of luster, poor quality. Foliar application of phosphate fertilizer should occur when this symptom occurs.
The potassium-deficient leaves are rough and wrinkled and drooping, the leaf margins are curled, spots appear, the center of the spots is necrotic, and the holes are pierced. Generally, the application of nitrogen fertilizer is too heavy, which will aggravate the symptoms of potassium deficiency. The amount of nitrogen fertilizer should be controlled, and the potassium fertilizer should be applied in time. In the middle and late stages, potassium dihydrogen phosphate can be sprayed on the foliar surface.
Magnesium deficiency is generally prone to magnesium deficiency in sandy loam and rainy seasons. It shows that the leaf margin and the veins are chlorotic from the bottom to the top, and the lower part is white, but generally does not die dry, which can be distinguished from the symptoms of potassium deficiency. Once the symptoms are found, the magnesium sulfate should be applied in time.
In the absence of calcium, the leaves are light green, then the tip of the young buds is bent down, and the tips and edges of the young leaves gradually die. Calcium is weak in the body of tobacco and rarely transfers from the old leaves to the young leaves. Therefore, calcium should be supplied in time throughout the tobacco growth period.
The young leaves of boron-deficient buds are light green, the stems become grayish white, the leaves basically stop growing, and the base tissues of young leaves are ulcerated. For the tobacco used for seeding, if the flower is deficient in boron, the top of the flower will wither and fall off, and it will not be strong or firm. It should be sprayed with a certain concentration of borax in time to supplement it.
Sulfur deficiency mainly occurs in the early or dry season, the plant turns pale green, the upper leaf color is lighter than the lower leaf color, the lower old leaves are not scorched like nitrogen deficiency, the tip of the leaf tends to curl down, and the leaf has protrusions. Bubble point. Symptoms usually disappear after the rain.
The leaves in the lower part of the zinc-deficient tobacco appear to fade at the edge of the tip, and then die or smash. The dead part began to be water-stained, and then expanded to accelerate, and finally turned reddish brown and dry. Each mu can be sprayed with 100-120 kg of zinc sulfate solution from 0. 1% to 0.5%.
The upper leaves of the copper-deficient plants are withered and cannot be recovered. In the flowering period, copper is scarce, and the main stem of the tobacco plant cannot stand upright. It is advisable to spray 0.1%-0.2% copper sulphate solution in time, and spray 100-150 kg per acre.
(Zhuo Jinliang, Zoufang Tobacco Development Zone, Renju Town, Pingyuan County)
From: Southern Rural Newspaper
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