What are the causes of soybean flower and pod drop?
Soybean is the soybean, and it is one of the important grain and oil crops in our country. With the rapid development of the soybean planting industry, its planting scale and planting area are becoming wider and wider. However, during planting, the phenomenon of flower and pod drop is also increasing day by day, seriously affecting the yield and quality of soybean and reducing growers' income. So what are the causes of soybean flower and pod drop? Let's take a look together.
1. Poor ventilation and light penetration
During planting, because the sowing or planting density is too high, ventilation and light penetration are poor, the plants are prone to excessive vegetative growth and close the rows too early, the lower half of the plants receive poor light conditions, and leaf yellowing and shedding are very likely to occur. Photosynthesis is poor, and the production and accumulation of nutrients are relatively low, so flower and pod drop is likely to occur.
2. Unreasonable nitrogen fertilizer application
Nitrogen has a promoting effect on plant growth. When planting soybean, reasonable application of soybean can promote the development of soybean rhizobia, increase the plant's nitrogen fixation amount, and improve yield. However, if nitrogen fertilizer is applied excessively, it will not only inhibit the nitrogen fixation ability of soybean, but also cause nutrient excess, leading to excessive vegetative growth, canopy closure, and lodging, resulting in flower and pod drop.
3. Nutrient imbalance
When soybean is flowering and setting pods, it is the period of greatest demand for nutrients. At this time, the demand for nutrients accounts for 45%-55% of the total demand. If nutrient supply is insufficient or imbalanced, it will lead to a large amount of flower and pod drop. Therefore, when soybean is flowering and setting pods, topdressing must be done in time to ensure nutrient supply, so that it can produce more flowers and set more pods and increase yield.
4. Improper water management
Soybean's demand for water varies with each growth stage. During the flowering and podding stage, if water is insufficient, the plants will wilt, and their ability to absorb soil nutrients will be poor, while the lack of water and nutrients will lead to a large amount of flower and pod drop. However, if there is too much water, the ground temperature is relatively low, and the humidity is high after rain, it will affect the plant's photosynthesis, causing nutrient synthesis and transport to be slower and more flower and pod drop.
5. Pests and diseases
Pests and diseases are one of the main factors affecting the soybean planting industry. Pests and diseases will damage the plant's leaves, causing the leaves' photosynthesis to weaken, and nutrient synthesis and transport to be affected, thus causing flower and pod drop.
The above is an introduction to the causes of soybean flower and pod drop. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.