What issues should be noted with continuous soybean cropping?
We know that any crop will run into problems as long as it is repeatedly cropped on the same land, and the common problems are soil nutrient imbalance, worsening pests and diseases, and severe yield reduction. Below, the editor will bring you the issues to note with continuous soybean cropping, let's take a look together.
1. Worsening pests and diseases
The most common problem with continuous soybean cropping is worsening pests and diseases. The pathogens and insect eggs from the previous crop parasitize in the residual stalks, weeds and soil, and after replanting, as the temperature rises, they begin to act up, and become more severe year after year. Common diseases include bacterial spot disease, black spot disease, damping-off, and yellow wilt, among which nematode disease is the most serious. Nematode disease mainly damages the root system, causing poor plant growth; in the later stage the root system dies, causing premature aging of the plant and severe yield reduction, and in serious cases it may cause total crop failure.
2. Microbial toxicity
When the soybean root system absorbs nutrients and water, it also secretes an acidic substance, which is a toxic substance that has a huge impact on soybean growth. If it is crop rotation, there is less toxic substance remaining in the soil, so the impact on the plants is not great; but if it is continuous cropping on the same land, the content of this toxic substance in the soil is higher, which will seriously affect the normal nutrient metabolism of soybeans, lead to poor root system growth and development, make the rhizobia less vigorous, inhibit plant growth, and cause yield reduction.
3. Nutrient imbalance
Because continuous soybean cropping on the same land causes phosphorus in the soil to be excessively consumed, the effective nitrogen-phosphorus ratio loses balance, affecting soybean growth and development. In addition, the content of other trace elements will also gradually decline, causing soybeans to develop problems such as yellowing and drying leaves, poor growth, and stunted plants. These are mostly caused by a lack of nutrients in soybeans. Therefore, in soybean production, repeated cropping on the same land should be avoided as much as possible, and it is best to implement a rotation pattern of more than three years with other crops.
4. Yield reduction from repeated cropping
According to is it a part-time job, generally soybean repeated cropping will reduce yield by about 6%-11% compared with normal cropping, while one year of repeated cropping will reduce yield by about 10%-16%, two years of repeated cropping will reduce yield by about 14%-24%, and three years will reduce yield by more than 30%.
The above is an introduction to the issues to note with continuous soybean cropping. We hope it can help you. If you want to learn more related knowledge, please follow us.