Cultivation Methods and Key Planting Techniques for Qi Costus Root
Qi Costus RootIt prefers a warm, humid environment and is cold-tolerant. It is not demanding about soil and can be grown in ordinary soil, but fertile sandy loam is best.
1. Planting methods:Propagate with bud heads or raise seedlings and transplant.
Bud head propagation: Planting can be done before the ground freezes or in early spring, but planting before the ground freezes is better, as it not only gives higher yields but also avoids the trouble of storing the planting material over winter. Use 75-100 kg of seed stems per mu. After choosing the site, apply plenty of base fertilizer, plow deeply, prepare the land, and make beds. After irrigation, cut the costus root stems lengthwise into several pieces according to bud head size; each piece must have 1-2 lateral buds. Be careful to remove the main bud to prevent bolting, which affects yield and quality. After cutting the stems, let them dry for half a day before planting so the wounds heal and the stems do not rot. When planting, dig holes at a row spacing of 40-50 cm and a hole spacing of 40 cm, place 1 seed stem in each hole with the cut side facing down (experience shows that cut side down produces stronger shoots and faster rooting than cut side up). Cover with 3 cm of soil, level the surface, and water. Plants set before the ground freezes only grow roots and do not emerge; they sprout the following spring. The spring planting method is the same as pre-winter planting, except that they sprout first and then grow roots.
Seedling raising and transplanting: From Qingming to Guyu, make furrows at a row spacing of about 20 cm, sow the seeds evenly, cover with soil just enough to cover the seeds, and keep the bed surface moist before emergence. When the seedlings are about 5 cm tall, thin out the crowded ones. After autumn or around Qingming the following year, if bolting occurs, remove it immediately.
2. Main diseases and pests:Leaf spot disease easily occurs in dry seasons and can be controlled by spraying 1:1:150 Bordeaux mixture; in rainy seasons, roots easily rot in low-lying waterlogged spots, so drain promptly; pests include red spiders and white grubs. Red spiders can be controlled by spraying 50% malathion emulsifiable concentrate at 1000-2000 times dilution or dusting with 1% malathion powder at 1.5-2 kg per mu. White grubs can be killed by drenching with 90% trichlorfon at 1000 times dilution.
3. Harvesting and processing
The medicinal part is the root. In late autumn, when the leaves turn yellow and withered, dig them out, remove the stems, leaves, and soil, cut them off 5-7 cm below the bud head, and dry them in the sun for medicinal use. Keep the bud heads as seed stems; if not planted before winter, they can be buried underground for storage.