The blue root, also known as northern blue, big green root, etc., is an annual or biennial plant of the genus Woad in the family Cruciferae. It is adaptable, cold-resistant, drought-resistant, and does not require strict soil conditions. General soil can be planted, like loose, fertile, moist sandy soil planting.

First, the efficacy of the blue root

The root is called blue root, containing black mustard glucoside, indigo red, B-sitosterol, adenosine, palmitic acid, a variety of amino acids and so on. The leaves are called big green leaves, rich in mineral elements, vitamins and a variety of nutrients; contains at least 17 kinds of amino acids, including 7 kinds of essential amino acids; total sugar content, glutamic acid content, VB2 content and K content is high. Its roots and leaves can be used as medicine, with the effect of clearing heat and detoxification, cooling the blood and so on. The root is used for medicine, which has the function of clearing heat and detoxification and cooling the blood. The main treatment for viral colds, tonsillitis, mumps, epidemic encephalitis B, acute infectious hepatitis, sore throat and so on. Its leaves for medicine, called the big green leaves, with the same effect as the root, and the leaves can be used as a kind of health care vegetables, eating at the same time have the function of strengthening the body. The planting area is large, the harvest period is long, the yield is high, and the economic benefits are considerable.

Edible: 1, big green leaves: wash and cut into small breaks, into the water blanch to 6 ~ 7 mature after fishing, in the cool water immersion 3 to 5min, empty out of the water, add garlic, salt, vinegar and other seasonings, mix well to eat, can be stir-fried with meat or vegetarian burned. 2, blueberry root: the main medicinal, but also to take a little of the root of the soak to drink, or a small amount of marinated.

Therapeutic effect: the blue root is bitter, cold; to the heart, liver, lungs, stomach meridian; has a heat, detoxification, cool blood, pharyngeal effect, mainly used for headache, fever, sore throat, rash, mumps and other conditions of the treatment. It has broad-spectrum antimicrobial effect in vitro, and is a traditional Chinese herb for antibacterial, anti-inflammatory, pain relief and fever reduction. In addition, the root contains a variety of antiviral substances, has a strong inhibition and killing effect on the virus.

Second, the cultivation of technical points

1, selecting the land rectification

Selected terrain flat, well-drained, loose and fertile sandy loam, in the fall, turn the soil more than 40cm deep, the deeper the better. Combined with the land acreage into the rotted chicken manure 5000kg, 50kg of compound fertilizer turned into the soil as a base fertilizer, and then flattened and harrowed, the next year at the end of March to the beginning of April into a 70cm wide north-south raised beds, beds on both sides of the digging drainage ditch, the ditch width of 40cm, in order to prevent stagnation of water.

2, sowing

spring sowing in early April, the ground temperature of 4 ~ 5 ℃ can be sown, sowing in the bed according to the row spacing of 25cm open ditch, ditch depth of 3 ~ 4cm, and then to the ditch water, water seepage sowing, sowing with a rake mulch cradling flat, a little suppression, 5 to 7d can be out of the seedling. The amount of seed used 1.5~2kg/mu or so.

3, field management

(1) between seedlings. Seedling height of 8~10cm for seedlings, medicine and vegetable production can be appropriate to increase the density, according to the plant spacing 3cm seedlings.

(2) Plowing and weeding. The first time combined with inter-seedling weeding, later depending on the field conditions, to keep the field free of weeds. Stop weeding in the plow after sealing the ridge.

(3) fertilizer. After applying sufficient bottom fertilizer, to the first leaf picking basically no fertilizer. After each leaf picking, apply 1 time of compound fertilizer, the dosage per mu is 10~15kg, plus urea 5~8kg, in order to promote the development of new leaves.

(4) watering, drainage. After sowing in dry weather, watering should be timely to maintain adequate moisture. When there is too much rain, the ditches should be cleared and drained in a timely manner to prevent water from accumulating in the field.

4, pest control

(1) mildew. Mainly jeopardize the leaves. At the beginning of the disease, the back of the leaf produces white or gray-white mold, no obvious spots and symptoms. With the aggravation of the disease, light green spots appear on the leaf surface, and in severe cases, the leaves die. Prevention and control methods: ① clean the field after harvest, the diseased branches and leaves centralized burned, buried, can reduce the overwintering source of disease; ② reduce the temperature of the field, discharge water in a timely manner, improve ventilation and light conditions, harvesting leaves in a timely manner; ③ early onset of the spray Antaisheng 600 times liquid, every 7 to 10d spray 1, sprayed 2 to 3 times.

(2) easy to occur in the rainy season, so that the root rot, resulting in the death of the whole plant. Prevention and control methods: ① timely drainage, timely removal of diseased plants, lime sprinkled in the diseased holes or diseased rhizomes; ② early onset of 70{bf}methyltropazine 1000 times liquid drenching holes.

(3) cabbage greenfly: adult whitefly, usually spawned on the leaves of the bluegrass, larvae bite the leaves, resulting in holes, notches, and in severe cases only the leaf veins. Prevention and control methods: the early stage of the damage can be used biopesticide BT emulsion 200~250g/mu, or 90{bf} trichlorfon 800 times liquid spray, every 7 to 10d1 times, even spray 2~3 times.

(4) leaf miner: parasitized in the leaves, leaf damage into an irregular curve, serious leaf green. Prevention and control methods: the early stage of the damage can be used 1.8{bf} abamectin emulsion 2000 times, or 1.8{bf} high efficiency cypermethrin emulsion 1000 times, such as spraying prevention and control, every 7 to 10d1 times, sprayed 2~3 times.

5, harvesting and processing

Big Green Leaf: between the seedling, leaf growth to 10 ~ 12 cm, from the base of the plant 2cm from the ground to cut, spring sowing can be harvested in early May to mid to late October 4 ~ 5 times. The remaining part for vegetable use can be spread out in the sun until 70-80% dry, bundled into small handfuls.

Panax quinquefolium: In mid to late October, when the above ground stems and leaves are yellow, dig the roots. First in the border ditch on one side of the 60cm deep ditch, and then carefully dug up along the front, do not hurt the roots or broken roots. Transported back, remove the soil and stems and leaves, wash, sun to seven or eight percent dry, tied into small bundles, and then sun to dry, can be dried in rainy days.