Causes and preventive measures of falling flowers and pods of knife bean

Knife beans believe that many friends have eaten, and there are many people who grow knife beans, but many friends often find them falling flowers and pods in the process of planting. What is the reason for this? How to prevent it? Let's get to know it with the editor.

First, the reason for the drop of flowers and pods of knife beans

1. Temperature discomfort

The drop of flowers and pods of knife beans is closely related to the air temperature, and the optimum temperature for growth is between 20 and 25 degrees. The phenomenon of falling flowers is very likely to occur if the high temperature is above 28 degrees before flowering, and the phenomenon of falling flowers above 30 degrees is aggravated, and the rate of falling flowers above 35 degrees is more than 2/3.

2. Malnutrition

At the early stage of flowering, the phenomenon of falling flowers and pods occurred due to the excessive growth of bean seedlings and the competition for nutrients between vegetative growth and reproductive growth. There is a strong demand for light when knife beans blossom and bear pods, if the planting is too dense. It often results in rapid blocking between branches and leaves, and the accumulation of assimilation substances decreases, resulting in a significant decline in plant stress resistance, long-term undernutrition in the development of flower organs, and serious flower and pod drop.

3. Temperature discomfort

Knife beans are afraid of drought and waterlogging, and the rest of the high temperature and drought weather in flower bud differentiation will make pollen cell division acute, causing anther infertility or death, resulting in falling flowers. On the other hand, in rainy weather, improper drainage and stagnant water in the soil affect the emission of pollen and cause a large number of fallen flowers.

II. Preventive measures

1. Scientific watering

Knife bean is a very important condition for the growth and development of knife bean. If it is not watered properly, it is easy to cause flowers and pods to fall off and reduce yield, so watering should grasp the principle of watering pods but not watering flowers, that is, it is not suitable to water too much or too much when flowering. This can avoid watering too much and cause falling flowers, and gradually increase the amount of water after podding.

2. Reasonable close planting

The sowing density of knife bean varies with variety and cultivation season, general trailing type variety row spacing is 65-80 cm, hole spacing is 20-25 cm, while dwarf type variety, row spacing is 30-40 cm, hole spacing is 25-30 cm.

3. Scientific fertilization

Knife bean has a long growth cycle, blooming and podding at the same time, so the base fertilizer should be fully applied, topdressing frequently, the base fertilizer is mainly organic fertilizer, and the nitrogen, phosphorus and potassium fertilizer should be reasonably matched at the same time. After the first harvest and in the middle stage of podding, topdressing was applied for 1 and 2 times respectively, and once if the plant grew weakly in the later stage.

4. Chemical control

Bean inflorescences can be sprayed with naphthalene B and naphthoxy acetic acid every 7-10 days, which can significantly reduce the phenomenon of falling flowers and pods.

The above is the introduction of the causes and preventive measures of falling flowers and pods. I hope I can help you. If you want to know more about it, please follow us.