How to grow rehmannia

We may not have seen Rehmannia glutinosa, but we are certainly no stranger to the term Rehmannia glutinosa, because basically people who have watched TV have heard advertisements for Liuwei Dihuang pills, so we know one effect of Rehmannia glutinosa. In fact, it has many other functions, such as clearing heat and cooling blood, nourishing yin and promoting fluid, and treating diseases such as hematemesis and internal heat. So what we need to know today is that how to plant Rehmannia glutinosa will be better, and the yield will be higher. Let's take a look.

1. Soil preparation and fertilization

Rehmannia glutinosa is a kind of light-loving plant, generally wild Rehmannia glutinosa will also grow on sunny slopes and plots with plenty of light, and the selection of planting land is a basic condition for high yield of Rehmannia glutinosa. Therefore, we can choose the planting site according to the growth habits of Rehmannia glutinosa, preferably in the land with plenty of sunshine, good water storage and drainage, loose soil and rich in dry organic matter. Deep digging should be carried out during soil preparation, so as to get rid of impurities and pests in the field as much as possible, and then spread evenly in the field according to about 5,000 jin of fertilizer per mu, turn the land again, level the land, and finally make ridges and ditches, you can wait for sowing.

2. Scientific sowing

Rehmannia glutinosa is usually planted around April every year, and the way of planting is usually tuber planting and seed sowing. Before planting, we also need to thoroughly disinfect the planting land, and then sow it. This can reduce the occurrence of diseases. What should be paid attention to in tuber planting is to choose sturdy ones with no diseases and insect pests and strong vital signs, so that the survival rate, quality and yield can be guaranteed. The use of seed sowing requires seed drying, seed soaking, seed dressing and sprouting, which can promote the speed of seedling emergence and facilitate unified management.

3. Reasonable close planting

In order to ensure the yield of Rehmannia glutinosa, we need to carry out reasonable density planning, and usually we need to manage it according to the fertility of the soil. In relatively fertile soils, we usually plant at a distance of 20 cm between rows and 15 cm between plants, while the poorer soils are planted at a distance of 10 cm between rows and 5 cm between plants. In this way, the land can be fully utilized without affecting the yield of Rehmannia glutinosa.

4. Field management

No matter which sowing method is adopted, generally, after emergence, we first need to check the emergence of seedlings in the field, and then carry out timely interseedling and seedling replenishment, so as to ensure the evenness of seedlings in the field, and remember to water them after planting, so as to be willing to improve the survival rate, or it is best to choose before and after rain when replenishing seedlings. Because the root system of Rehmannia glutinosa is relatively shallow, we should be more careful when weeding, do not hurt the rhizome of Rehmannia glutinosa, and weeds near the rhizome of Rehmannia glutinosa can only be pulled by hand. The growth of Rehmannia glutinosa needs a lot of nutrients, in addition to the base fertilizer, at least two or three times of topdressing is needed, in which fertilizer needs to be applied specifically according to its growing period. Rehmannia glutinosa has high requirements for water, and generally follows the principle of three watering and three non-watering. Specific watering methods can be consulted.

5. Pest control

The most common diseases and insect pests of Rehmannia glutinosa are spot blight, ring disease, root rot, virus disease, red spider, ground tiger and other underground pests, among which these diseases are basically caused by fungi or bacteria infected by fungi or bacteria in the field. It not only harms the stems and leaves of Rehmannia glutinosa, but also harms the tubers of Rehmannia glutinosa, so we can use carbendazim and Bordeaux solution to control. Red spiders are usually sprayed with mites, while ground tigers and underground pests can be watered with trichlorfon wettable powder.