Detailed Guide to Japanese Knotweed Cultivation Techniques: Planting Methods and Management Key Points
Japanese knotweed (Polygonum cuspidatum) is a perennial herbaceous plant of the Polygonaceae family, genus Polygonum. Its rhizome can be used medicinally and has effects such as promoting blood circulation, dissipating blood stasis, unblocking meridians, and relieving cough. It is widely used in daily life and is one of the raw materials for many Chinese patent medicines. Currently, it is cultivated artificially in various regions. Let's take a look at its cultivation techniques below.
1. Site Selection and Land Preparation
Japanese knotweed has a well-developed root system and strong cold and drought tolerance, with low soil requirements. However, it is not suitable for planting in low-lying, waterlogged land. After selecting the planting site, first plow the soil 20-25 cm deep, remove large stones, break up large clods of soil, and then apply 1500-2000 kg of fully decomposed farmyard manure per mu as base fertilizer. After fertilizing, mix thoroughly with the top 5-10 cm of soil, then build raised beds with a height of 15-20 cm and a width of 50-55 cm.
2. Propagation Methods
Japanese knotweed is generally propagated by seeds or rhizomes, but seed propagation takes a long time from sowing to harvest, and the seed germination rate is relatively low with slow propagation speed, so rhizome propagation is mostly used in production. Rhizome propagation also has the characteristics of easily available materials, easy survival after transplanting, and quick results. Dig out the plant's root system, divide it into several segments, with each segment having 2-3 buds. Then dig holes or furrows on the bed surface for planting, cover with soil and water after planting.
3. Field Management
After the seedlings emerge, as the temperature rises, their growth rate will also accelerate. At this time, weeding work should be done well, and intertillage should be carried out in conjunction with weeding. When the seedlings grow to a certain extent, thinning and replanting should be done in time to increase ventilation and light transmission between plants, so as to avoid excessive density that affects seedling growth and easily induces pests and diseases. Scientific fertilization is a key measure for high yield of Japanese knotweed, so after planting, fertilizer should be applied in time according to the soil fertility status. Generally, 1-3 applications of quick-acting fertilizer can be applied in conjunction with intertillage and weeding, paired with an appropriate amount of trace element fertilizer.
4. Pest and Disease Control
Japanese knotweed has extremely strong disease resistance, with no diseases at the base during cultivation. Mainly pests affect yield and quality. Common pests include scarab beetles and leaf beetles. Scarab beetles appear in May, mainly feeding on tender stem tips and leaves. In severe cases, they will eat all the leaves of the entire plant, at an extremely fast speed. Manual capture and light trapping methods can be used for control, with an effectiveness of over 90%. Dimethoate 2000-fold solution can also be sprayed to kill adults.
The above is an introduction to the cultivation techniques of Japanese knotweed. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.