The cultivation techniques of Isatis root

First, the selection of land for planting Banlan root should be selected loose loose fertile soil. Before the crop is harvested, it is timely plowed and the autumn plough is deeper and the better. Because the main root of Banlangen can reach about 50 cm in the soil, deep plowing can promote the growth of the main root straight, smooth, and without spasm. Before planting 3,000 to 4,000 kilograms per mu of farmer's base fertilizer, spread the basal fertilizer thoroughly and plow deeply to prepare the soil.
Second, sowing Banlangen breeding with seeds. The seed germination rate is about 70%, the temperature is between 16°C and 21°C, there is enough humidity, and the seedlings emerge 5 days after sowing. Seeding spring and summer sowing. Spring sowing in the late 3 to early April sowing, summer sowing no later than June. In March of the following year, twitching and budding began, and flowering took place in April. The fruits matured in June and the whole growth period was about 9 months to 11 months.
Banlangen with multi-cast method, according to the groove width of 20 cm to 25 cm open ditch, ditch depth of 1.5 cm to 2 cm, the seeds dipped in water after draining, mix in fine soil, evenly scattered into the ditch, covering about 1 cm, slightly Add suppression. Per acre sowing rate of 2 kg to 2.5 kg.
Third, field management In Banlangen plant height 4 cm to 7 cm, according to the spacing of 6 cm to 7 cm in the planting seedlings, while weeding, loose soil. After the seedlings were planted, the plants were grown and watered and topdressed. In the early stage of growth, Banlangen should generally not be wet, so as to promote the roots to lower. In the late growth stage, the soil is kept moist and nutrient absorption is promoted. In general, from late May to early June, 40 to 50 kg of ammonium sulfate is applied per mu, and 7.5 to 15 kg of superphosphate are mixed into the bank. Sufficient water and fertilizer leaves can flourish, and well-developed Banlan root can harvest two leaves in late June and mid-August. In order to ensure the growth of the roots, topdressing and watering should be performed after each leaf collection.
IV. Seed and seed collection The annual indigo flower does not bloom, and it is harvested after spring sowing. When harvesting the roots, choose roots that are free of pests and diseases, and that are thick and robust and that are free from tillering. 50 cm spacing and 20 cm to 25 cm spacing were planted on fertile ground. Watering in time after planting. In the second half of November, a layer of horse dung or loop fertilizer is applied to protect against cold. In the spring of the second year, watering, loosening and fertilizing will be timely. After being cooked from May to June, it shall be dried and stored in a dry and ventilated place.
Fifth, excavation in the ground after the withered roots in October. The spring sowing should be excavated from the beginning of autumn to the frost, and the autumn sowing should be excavated after the frost falls. According to local experience, the quality of the excavation in the late autumn is better than that in the spring. Therefore, excavation in the fall should be promoted. When digging, excavate 60 cm deep trench next to the raft, and then plan to dig forward to net soil, dry to 70% to 80% dry, tie into small bundles, and then dried thoroughly. It is better to use roots that are straight, stout, solid, and powdery. In the northern part of June, when the seedling height is 18 cm to 20 cm, the leaves can be harvested once. When cutting, leaves 3 cm to 5 cm, and when the seedlings grow again, the leaves can be cut again.

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