Varieties and varieties of Panax notoginseng
Panax notoginseng: slightly spindle-shaped or conical, 1~6cm long, 1 ~4cm in diameter. The surface is grayish yellow (commonly known as "iron sheet") or grayish brown (commonly known as "copper skin"), with intermittent longitudinal wrinkles and a few leather holes, with stem marks at the top and tumor-like protrusions around (commonly known as "lion head"). There are branch root fractures on the sides. Solid quality, broken after the leather and wood often separated. Cross section greyish green, yellow green or gray white (commonly known as "iron bone"), skin has small brown resin channel spots. It tastes bitter and then slightly sweet.
Spring seven: usually weight, plump, frog solid; and winter seven is light, loose bubbles, surface wrinkles and more grooves.
Cut seven: irregular shrinkage block or strip, surface and there are several obvious stem marks and ring patterns, section center gray, gray edge.
Notoginseng: cylindrical, 2~6cm long, upper diameter about 0.8cm, lower diameter about 0.3cm. The cross section is taupe.
Tianqi beard: thin cylindrical, curved not straight, diameter in 0.5cm below, the rest with ribs.
Sanqi powder: grayish yellow powder, put it into pig blood, can turn pig blood into water is true.
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Growth environment of Panax notoginseng
Panax notoginseng is a shade-loving plant. Like warm winter and cool summer environment, afraid of cold and heat; like damp but afraid of stagnant water, soil water content of 22% to 40% is appropriate. It can grow when the temperature is not more than 35 ℃ in summer and 5 ℃ below zero in winter, and the suitable temperature for growth is 18-25 ℃. Panax notoginseng has loose requirements on soil and a wide range of adaptation, but it is better to use sandy loam soil with loose soil and good drainage. Areas where sticky, sandy and low-lying areas are prone to stagnant water should not be planted. Avoid continuous cropping, soil pH 4.5-8. There is only one palm of Panax notoginseng every year.
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Diseases of Panax notoginseng at seedling stage and its control
Because Panax notoginseng grows in a shady and humid environment all the year round, many diseases such as black spot, round spot, blight, rot, powdery mildew and other diseases are seriously harmed, and the perennial losses caused by various diseases amount to 30% to 40%, and the serious ones reach more than 80%. In the stage of emergence and long leaves of Panax notoginseng, the plant is tender, the root system is underdeveloped and the stress resistance is poor, which is an important period for the first infection of many kinds of pathogens. If the spring rain is early and frequent, the disease will spread rapidly and the damage will be serious. It usually takes 60 to 75 days from sowing to emergence of Panax notoginseng.
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