How to Control Excessive Growth in Soybeans? Latest Technical Method Tutorial
During the growth of soybeans, improper fertilization, excessive moisture, or high temperature and high humidity conditions can cause excessive vegetative growth of soybean plants, leading to serious flower and pod drop, a sharp decline in yield, and affecting farmers' income. So how do you control excessive growth? Let's take a look at the detailed introduction.
1. Symptoms of excessive growth
Generally, when excessive growth occurs in soybeans, the leaves grow vigorously, the field is completely closed in, and permeability is extremely poor, which is when growth control becomes necessary. In addition, from the outward appearance, if the upper leaves of the soybean are dark green and the leaf area is relatively large, while the lower leaves show some yellowing and shedding. You can also judge from the flower clusters: if there are only a small number of flower clusters on the upper part of the main stem, while the branches and lower part have very few flower clusters, this is also a sign of excessive growth.
2. Fertilization for growth control
When fertilizing, apply as little nitrogen fertilizer as possible, because the soybean root system itself has a very strong nitrogen-fixing capacity, so in rainy climates, nitrogen fertilizer must be strictly prohibited for fields that have already shown excessive growth. A small amount of molybdenum fertilizer can be sprayed at the early flowering stage, with a concentration of 0.1%-0.2% being sufficient, while for fields with poor growth, a small amount of nitrogen fertilizer can be applied together with molybdenum fertilizer at the early flowering stage, at about 5 kg per mu, and attention should also be paid to the concentration.
3. Chemical growth control
At present, the most common growth control measure in production is spraying paclobutrazol, which is a plant growth retardant that can block the rational action of growth promoters in plants and inhibit longitudinal cell growth. However, when using paclobutrazol for growth control, the requirements for timing and dosage are relatively strict, and it degrades slowly. It can affect the growth of subsequent crops.
4. Artificial growth control
During the flowering and podding stage of soybeans, chemical growth control cannot effectively stop excessive growth of soybeans, so artificial growth control techniques can be adopted at this time, using methods such as leaf thinning and pinching to control excessive plant growth and increase field permeability. In the early stage of excessive plant growth, promptly pinch and prune the leaves of excessively growing plants, but it should not be too severe; generally, it is appropriate to pinch off 2-3 cm of the tender tip at the top of the main stem.
The above is an introduction to soybean growth control technology. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.