How to Grow Rehmannia Well? Key Points of the Latest Cultivation Techniques
We may not have seen Rehmannia, but we are certainly not unfamiliar with the term Rehmannia, because basically anyone who has watched TV has heard the advertisement for Liuwei Dihuang Wan, so we also know one of the effects of Rehmannia. In fact, it has many other effects, such as clearing heat and cooling blood, nourishing yin and promoting body fluid production, and treating conditions such as vomiting blood and internal heat. So today what we need to understand is how to grow Rehmannia better and with higher yield. Let's take a look below.
1. Land preparation and fertilization
Rehmannia is a light-loving plant. Wild Rehmannia generally also grows on sunny hillsides and plots with relatively sufficient light, and the choice of planting site is a basic condition for high yield of Rehmannia. Therefore, we can choose the planting site according to the growth habits of Rehmannia. It is best to plant in a plot with sufficient sunlight, good water storage and drainage, loose soil, and rich organic matter. During land preparation, deep plowing should be carried out, which can remove field impurities and pests as much as possible. Then spread about 5,000 jin of fertilizer per mu evenly in the field, plow the land again, level the ground, and finally make ridges and open furrows, then wait for sowing.
2. Scientific sowing
Rehmannia is generally planted around April each year, and the planting methods are generally tuber planting and seed sowing. Before planting, we also need to thoroughly disinfect the planting site, and then sow, which can reduce the occurrence of diseases. For tuber planting, it is important to choose relatively thick, pest- and disease-free tubers with strong vitality for planting, so that the survival rate, quality, and yield can all be guaranteed. For seed sowing, it is necessary to sun the seeds, soak the seeds, dress the seeds, and promote germination, which can promote the speed of seedling emergence and facilitate unified management.
3. Reasonable close planting
In order to ensure the yield of Rehmannia, we need to carry out reasonable density planning. Usually, we need to manage according to the fertility of the soil. For relatively fertile soil, we generally plant at a row spacing of 20 cm and a plant spacing of 15 cm, while for relatively poor soil, we plant at a row spacing of 10 cm and a plant spacing of 5 cm. In this way, the land can be fully utilized without affecting the yield of Rehmannia.
4. Field management
No matter which sowing method is used, generally after the seedlings emerge, we first need to check the seedling situation in the field, and then carry out timely thinning and reseeding, which can ensure uniform seedlings in the field. After planting, remember to water, which can help improve the survival rate, or when reseeding, it is best to do it around rainy weather. Because the root system of Rehmannia is relatively shallow, we need to be careful when weeding so as not to damage the roots and stems of Rehmannia, and weeds near the roots and stems of Rehmannia can only be pulled out by hand. The growth of Rehmannia requires a large amount of nutrients. In addition to base fertilizer, at least two to three topdressings are needed, and the specific fertilizer type to be applied should be determined according to its growth period. Rehmannia has high water requirements. Generally, watering follows the principle of watering three times and not watering three times. For the specific watering method, you can consult.
5. Pest and disease control
The most common pests and diseases of Rehmannia include leaf spot disease, ring rot, root rot, viral disease, red spiders, cutworms, and other underground pests. Among these, the diseases are basically fungal or pathogenic infections mostly caused by excessive humidity in the field. They not only harm the stems and leaves of Rehmannia, but also harm the tubers of Rehmannia. Therefore, we can use carbendazim and Bordeaux mixture respectively for control. For red spiders, we usually use acaricide for spraying and killing, while for cutworms and underground pests, trichlorfon wettable powder can generally be diluted with water for irrigation.