The latest planting techniques and methods tutorial for Rehmannia
Rehmannia is also known as Sheng Dihuang and wild Rehmannia. It is the tuberous root of the Scrophulariaceae plant Rehmannia (Rehmannia glutinosa), a perennial herbaceous plant and a traditional Chinese medicinal material. It has the effects of clearing heat and cooling blood, nourishing yin and promoting fluid production, stopping bleeding, and resisting coagulation. It is mainly used to treat conditions such as damage to yin from heat disease and sore swollen throat. Market demand is extremely high, and it sells well at home and abroad, so many people achieve prosperity by growing it. So how should it be planted? Let's take a look together.
1. Land selection and soil preparation
Rehmannia has extremely strong adaptability. Wild plants mostly grow on well-drained sandy land and barren slopes. It likes an environment with sufficient light and is suitable for planting in loose, fertile soil. If the soil is relatively heavy in clay or relatively hard, it will affect the growth of its tuberous roots and affect yield. If the soil drainage is poor, it is very prone to water accumulation, which will cause the tuberous roots to rot. In addition, continuous cropping should be avoided; it is best to rotate with crops such as sorghum, vegetables, and cotton for 3-4 years. When planting, plow the soil deeply to 30 cm, apply fertilizer, then plow deeply again, rake it level, and make fine, smooth beds.
2. Seed selection and planting
When selecting seedlings for sowing, strict standards must be followed. Choose plants that are disease-free and vigorous in growth. After selection, break them into small sections about 5 cm in size and air-dry them for 1-2 hours so the wounds heal before sowing. When sowing, plant at a reasonable density. Generally, about 100 kg of seed is used per mu. After sowing, cover with 5-7 cm of soil and water. In low-temperature areas, ground temperature can be raised by covering the ground. As long as temperature and moisture are suitable, seedlings generally emerge in 25-30 days.
3. Fertilizer and water management
When fertilizing Rehmannia, apply more phosphorus and potassium fertilizer. In addition, applying sufficient base fertilizer is also extremely important for yield. After the seedlings are uniform, in order to make the seedlings grow quickly, topdress while watering. At this time, apply 15 kg of urea per mu. It can be dissolved in water and applied as a drench, or watered immediately after fertilization to speed up nutrient absorption. In the middle stage of growth, that is, in July, topdress with 10-20 kg of phosphorus fertilizer per mu. During the growth of Rehmannia, water frequently to keep the soil moist. However, in the late growth stage, when the tuberous roots are growing, it is afraid of water accumulation, which can easily cause root rot. Therefore, at this time, watering should follow the principle of not watering if there is no drought, not watering on cloudy days, and not watering at noon.
4. Field management
When the seedlings grow to more than 10 cm, thin them in time, leaving one plant per hole. If plants are missing, replant them. Replanting should be done on cloudy days, and it is best to transplant with soil. In the early stage of plant growth, the seedlings are too small and the root system is relatively shallow. At this time, weed to avoid affecting seedling growth. Weeding should be done by shallow hoeing, or by hand pulling, so as not to damage the root system. If planting on a large scale, it is recommended to use herbicides. During the growth of Rehmannia, in addition to the main root, some slender underground stems also grow, called string-skin roots. They consume a large amount of nutrients from the plant and should be cut off in time.
The above are the planting techniques for Rehmannia. I hope they can help you. If you want to learn more about medicinal herb cultivation knowledge, please stay tuned to us.