First, tobacco is an annual or limited perennial herb with glandular hairs; The roots are thick. The stem is 0.7-2 meters high and the base is slightly lignified. The leaves are oblong-lanceolate, lanceolate, oblong or ovate, and the tips are tapered.

Second, tobacco is a thermophilic crop and sensitive to temperature. Different temperature conditions have great influence on the quality and yield of tobacco.

Third, water is very important to tobacco. First, tobacco plants are tall, with wide leaves, large leaf area coefficient and strong transpiration, which requires more water supply. Second, moisture affects the effectiveness of fertilizer. Third, water affects the extension of leaves. When the water supply is sufficient, the cells of tobacco leaves expand greatly and can be fully stretched, and the leaves of tobacco leaves become longer and wider with loose structure.

Four, the whole plant of tobacco can also be used as pesticides and insecticides, and can also be used medicinally as anesthesia, sweating, sedation and emetic.

5. Native to South America. China is widely cultivated in northern and southern provinces. Widely planted in every corner from 55 north latitude to 40 south latitude, but its most suitable planting area is very narrow.

Extended data:

The most tobacco in China:

Baofeng County, Henan Province is the first county to reach the world level of high-quality tobacco leaves, and it is a pilot county for Sino-US cooperation to improve the quality of tobacco leaves in China, and its products have entered the international market.

Qujing City, Yunnan Province, the largest flue-cured tobacco base, grows about 850,000 mu of flue-cured tobacco. The annual output of tobacco leaves is 200,000 tons, accounting for about 7% of the country.

The largest burley tobacco base, Tujia and Miao Autonomous Prefecture in western Hubei, has planted more than 200,000 mu of burley tobacco, with an annual output of 600,000 tons, ranking first in the country in terms of output and quality.

The largest bases of oriental tobacco-Shengxian County and Xinchang County, Zhejiang Province, 1987 two counties bought tobacco leaves 1350 tons.

Henan Province, the largest tobacco-producing province, has an annual planting area of about 3 million mu and an output of about 800 million Jin, 40% of which is imported.

Shandong Province is the largest exporter of flue-cured tobacco. The annual export volume accounts for more than 50% of the total national export volume.

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