The causes and control measures of the latest yellow leaves of leek

Leek has many ways to eat, rich in nutrition, favored by consumers, and the planting area is very wide, but many vegetable farmers reflect the phenomenon of leaf yellowing of leek when planting, and when it is serious, all the leek in the field appear yellow leaf, which brings great economic loss to vegetable farmers. So what is the reason for the yellow leaves of leeks? How to solve? Let's take a look at the pro-farm network.

First, yellow leaf causes

1, lack of trace elements: generally in leek planting, lack of iron, copper, zinc and other trace elements, will cause the phenomenon of yellow leaves.

2. Partial application of nitrogen fertilizer: in order to make leek grow fast and shorten the growth cycle, some vegetable farmers apply nitrogen fertilizer in fertilization, ignoring the fertilization of other fertility, resulting in the imbalance of nitrogen, phosphorus and potassium fertilizer and inhibiting the absorption and utilization of other elements by roots. resulting in yellow leaves.

3. Excessive application of acid fertilizer: excessive application of acid fertilizer during fertilization will acidify the planting soil, hinder the growth and development of the root system, hinder the absorption of nutrients and water, and cause malnutrition in leek, resulting in yellow leaves.

4. no application of organic fertilizer: some vegetable farmers all apply chemical fertilizer, but not organic fertilizer or farm manure, resulting in the continuous decline of trace elements in the soil, resulting in soil agglomeration, poor permeability, affecting the respiration and absorption of the root system, causing yellow leaves, and causing large area death in serious cases.

5. Improper watering: excessive blind watering causes high humidity in the field or stagnant water in the soil, poor soil permeability, the same root system can not breathe normally, resulting in the phenomenon of malnourished yellow leaves.

6. Diseases and insect pests: many diseases and insect pests will lead to the phenomenon of yellow leaves in leeks and die normally in serious cases.

II. Prevention and control measures

1. Rational fertilization: in addition to a reasonable combination of nitrogen, phosphorus and potassium fertilizer, some organic fertilizers should be properly applied to ensure the content of trace elements in the soil, so that leek can absorb and utilize them and ensure a balanced supply of nutrition. In addition, fertilization should be based on each growth stage of leek. From September to October, about 100-450 jin of organic fertilizer per mu was applied and foliar fertilizer was sprayed several times to fully supply trace elements of leek. Also avoid the use of a large number of acid fertilizer, if it is caused by soil acidification of yellow leaves, can be sprinkled in the soil lime powder and plant ash condition pH, so that the soil back to normal.

2. Reasonable watering: watering should come according to the dry and wet soil and the weather. When the climate is dry and the soil is dry, the soil should be watered in time to keep the soil moist. When the soil is moist enough, there is no need to water, and in the rainy season, drainage and waterlogging prevention should be made in time. In addition, the soil quality of the soil should be considered in watering. Generally, the interval of sandy soil is shorter, while that of clayey soil is longer, and the soil should be loosened properly to increase permeability.

3. Prevention and control of diseases and insect pests: the prevention and control of diseases and insect pests should be given priority to. Generally, the soil and seeds should be disinfected during planting, the management of fertilizer and water should be strengthened during planting, the disease resistance of leek should be improved, and the right medicine should be given to the case when diseases and insect pests are found.

The above are the causes and control measures of leek yellow leaves brought by pro-agricultural network. I hope it can help you. If you want to know more about leek planting, please pay attention to pro-agricultural network.