Radix isatidis woad dry roots of cruciferous plants, alias grass leaf said the leaf, fabricated by the fresh leaves dark blue to indigo naturalis powder synthesis, medicine, with the root root said "banlangen", called "leaf", is a commonly used traditional Chinese medicine (TCM), have the function of heat-clearing and detoxifying, cooling blood, attending influenza, epidemic parotitis, epidemic encephalitis b, acute infectious hepatitis and sore throats and so on. Radix isatidis strong adaptability, relaxed on the climate and soil environment, can be grown in many parts of the in our country.

Biennial herbs, 40-120 cm tall. Taproot cylindrical, succulent hypertrophy, yellowish gray. Stems erect edge, slightly more than the upper branches, slightly pink cream; Base slightly smooth wood glabrous. Basal leaf with handle and blade obovate to wrap around needle form, turquoise, thick, apex obtuse, base gradually narrow, margin entire or slightly serrate; Cauline leaf yuan handle, leaf blade lanceolate or oval lanceolate, white powder, apex acute, base the earlobe, half amplexicaul, nearly entire. Compound raceme, the flower yellow, pedicel thin, bent into arc under after flowering. Short pod oblong, flat, apex obtuse and concave deficiency, or full cross-sectional shape, edge winged, dark purple when mature. Seed 1, two in dilute to 3, oblong. Flowering in April - may, fruiting in May - June.

Biennial herbs, 40-120 cm tall. Taproot cylindrical, succulent hypertrophy, yellowish gray. Stems erect edge, slightly more than the upper branches, slightly pink cream; Base slightly smooth wood, glabrous, Basal hominins leaf with handle and blade obovate to wrap around needle form, turquoise, thick, apex obtuse, Base gradually narrow, margin - or slightly serrate; Cauline leaf yuan handle, leaf blade lanceolate or oval lanceolate, white powder, apex acute, base on the earlobe, half amplexicaul, nearly -. The Compound raceme, the flower yellow, pedicel thin, bent into arc under after flowering, Short pod oblong, flat, apex obtuse and concave deficiency, or full cross - sectional shape, edge, winged, dark purple when said. The Seed 1, two in dilute to 3, oblong, flowering in April - may, fruiting in May - June.

Second, the growth habit

Second, the growth habit

Radix isatidis resilient to climate and soil conditions, general soil all can grow. Resistance to cold, happy event is warm, but afraid of water damage, in southern China for the summer, the northern cold region for recovery.

Radix isatidis resilient to climate and soil, the conditions, the general soil all can grow, hold to you, happy event is warm, but afraid of water damage, in southern China for the summer, the northern cold region for recovery.

Seed germination easily, 15 ℃ to 30 ℃ within 48 hours of germination, germination rate in more than 80%. The seed for 1 year to 2 years of life.

Seed germination easily, 15 ℃ to 30 ℃ within 48 hours of germination, germination rate in more than 80%, The Seed for 1 year to 2 years of life.

Radix isatidis normal growth and development process must go through the winter low temperature stage, can flower seed, so the production will take advantage of this feature, generally take spring or summer sowing, harvesting leaves and dig up the roots. Harvest year, evaded the spring temperature according to the local climate conditions, to prevent jarovization caused the bolting, affecting the quality, when the seeds produced by the "cannot be reserved for use.

Radix isatidis normal growth and development process must go through the winter low temperature stage, can flower seed, so the production will take advantage of this feature, and generally take the spring or summer sowing, harvesting leaves and dig up the roots. The Harvest year, evaded the spring temperature "according to the local climate, the conditions to prevent jarovization under caused the bolting, affecting the quality, when the seeds produced by the" always be reserved for use.

Third, cultivation techniques

Third, the cultivation techniques

1, optionally, soil preparation radix isatidis is a deep-rootedness plant, taproot up to 40-50 cm long, so the persons to be drainage good fertile sandy loam soil deep, planting, poor drainage of low-lying land or clay negative growth of radix isatidis. Before sowing the commune land 20-30 cm, basal, basal is given priority to with farmyard manure. Then deep, fine rake leveling and sand land can be a bit shallow.

1, optionally, soil preparation radix isatidis is a deep rootedness - plant, taproot up to 40-50 cm long, so the persons to be drainage good fertile sandy loam soil deep, planting, poor drainage of low - lying land or clay negative growth of radix isatidis. Before sowing the commune land 20 to 30 cm, basal hominins, basal hominins is given priority to with farmyard manure, Then deep, fine rake leveling and sand land can be a bit shallow.

2, reproduction method used for the propagation of the seed. Sowing date are for spring and early summer sowing. Seeded first by 20-25 cm row spacing on the surface of the strip out 20 cm deep shallow groove, and the seed evenly into the ditch, covering 1 cm, slightly boost pressure, soil moisture memory, proper watering. A comfortable temperature, seeding can be 7-10 days after emergence, YongZhongLiang per acre 5-6 kg.

2, reproduction method, informs the for the propagation of the seed, Sowing date are for spring and early summer Sowing. The Seeded first by 20-25 cm row spacing on the surface of the strip out of 20 cm deep shallow groove, and the seed evenly into the ditch, covering 1 cm, slightly boost pressure, soil moisture memory, the proper watering. A comfortable temperature, seeding can be 7 to 10 days after emergence, YongZhongLiang per acre 5-6 kg.

3, field management, seedling height 7 to 10 cm should be combined with row weeding

3, field management, seedling height 7 to 10 cm should be combined with the row weeding

Timely and thinning, finally according to the planting distance 6-8 cm singling. After singling, according to plant growth condition, appropriate topdressing one human excrement or fertilizer, such as in dog days of dry weather in the water in the morning and at night, avoid by all means under the sun.

Timely and thinning, and finally "according to the planting short 6-8 cm singling. After singling," according to plant growth condition, appropriate topdressing one human excrement or fertilizer, to the as in dog days of dry weather in the water in the morning and at night, get by all means under the sun.

Fourth, prevention and control of plant diseases and insect pests

Fourth, the prevention and control of plant diseases and insect pests

(1) the downy mildew. Starting in May and June, especially in the summer and the rainy season, the disease is severe, the main harm of blade. Method of prevention and cure: 1, clean the pastoral, processing strain, reducing agent; 2, rotation; 3, with 70% ethyl phosphate 70% aluminum manganese zinc 500 times liquid or cream mould net 800 times liquid spray, spraying once every seven days, continuous 2 times to 3 times.

(1) the downy mildew. Starting in May and June, especially in the summer and the rainy season, the diseases is severe, the main harm of blade. The Method of prevention and cure: 1, clean the pastoral, processing strain, reducing agent; 2, the rotation; 3, with 70% baton rouge phosphate 70% aluminum manganese any zinc 500 times liquid or cream mould.net 800 times liquid spray, spraying once every seven days, continuous 2 times to 3 times.

(2) the small white. The larvae, commonly known as the caterpillar on May harm blade, especially in early June to late June harm is serious, biological pesticide HT emulsions are available, and 200-250 - g per acre, or 90% trichlorfon 800 times liquid spray control.

(2) the small white. The larvae, commonly known as the caterpillar on May harm blade, especially in early June to newest June harm is serious, in pesticide HT emulsions are available, and 200-250 - g per acre, or 90% trichlorfon 800 times liquid spray control.

7 days to 10 days before the harvest is prohibited to use any pesticides, the whole growing season high toxic pesticides is strictly prohibited.

7 days to 10 days before the harvest is prohibited to use any pesticides, the whole growing season high toxic pesticides is strictly prohibited.

Five, collecting and processing

Five, collecting and processing

Before accept root, radix isatidis can harvest two leaves, spring sowing in 6 - in late July, seedling height to 20 cm, 2-3 cm stubble eli leaves; The dog days of high temperature season should not be harvested, lest cause death. After harvesting the dry leaves, medicinal indigowoad leaf. Radix isatidis should choose sunny days prior to the winter excavation of, also can spring up to dig, dig must dig deep, in case the plane is broken. Have used the machine to dig, the north to the net, the soil and leaf bask to completely dry can be used as a medicine. Seed technology, spring and summer sowing of radix isatidis in excavation of before winter, select disease-free, robust root transplanting to seed the ground, plant spacing 30 cm x 40 cm, stallion to appropriate chooses in the shelter, good drainage and sunny places. In the second year of tillering to strengthen water management, some under appropriate. In may - June seeds from yellow to black, the whole cut, dried threshing, do.

Before the accept the root, radix isatidis can harvest two leaves, spring sowing in 6 - in newest out, seedling height to 20 cm, 2 -- 3 cm stubble eli leaves; The dog days of high temperature season should not be harvested, lest cause death. After harvesting the dry leaves, medicinal indigowoad leaf. Radix isatidis should choose sunny days prior to the winter excavation of, also can spring up to dig, dig must dig deep, in case the plane is broken. Have used the machine to dig, the north to the net, the soil and leaf bask to completely dry can be used as a medicine. Seed technology, spring and summer sowing of radix isatidis in excavation of before winter, select disease-free, robust root transplanting to seed the ground, plant spacing 30 cm x 40 cm, stallion to appropriate chooses in the shelter, good drainage and sunny places. In the second year of tillering to strengthen water management, some under appropriate. In may - June seeds from yellow to black, the whole cut, dried threshing, do.