In the spring, garlic began to grow into a greening period, but many growers said that in many areas of the spring, there are problems such as dry tips, yellow leaves, weak growth, and dead seedlings. What is the cause? What measures should be taken? Let's take a look at the following.
I. Analysis of the causes of the dry yellow leaves of garlic
1. Planted in the same plot for many years. Long-term continuous cropping of garlic will cause more harmful organisms and germs accumulated in the soil, and the probability of occurrence of pests and diseases will increase. At the same time, soil compaction and salinization are caused. The roots of garlic absorb insufficient nutrients, which leads to weak plants, dry tips, yellow leaves, dead seedlings and dead seedlings.
2. Climate change. In winter, the soil temperature is too low, the humidity is too high, and the humidity and freezing damage may cause the roots of garlic to rot. Some soils have poor moisture in winter and high soil moisture, which will cause the phenomenon of dead and dead seedlings in garlic in the spring.
3. Reasons for garlic varieties. The resistance of different varieties of garlic is different. In general, the yellow garlic seedlings have higher probability of dry tip, dead seedling and dead seedling than the black and green seedling varieties, and the black and green seedling varieties have strong resistance to disease and stress.
4. Reasons for cultivation of soil. Different cultivated soil textures often lead to the appearance of dry tips, yellow leaves, weak growth, and stiff seedlings. Generally, the sandy loam soil has good permeability, and the dry tip, dead seedlings and dead seedling rate are relatively low. The soil is heavy and soil moisture is high, and the gas permeability is poor. Relatively speaking, the phenomenon of stiff seedlings is relatively high.
5. Impact of cultivation measures. Garlic is sowed too early before winter, which will cause dead seedlings and dead seedlings. If planting is late, the probability of occurrence is low. The depth of sowing has an effect on the dead seedlings and dead seedlings. The seedlings with deep seedlings and the dead seedling rate are relatively low; the density is too large, and the yellow leaf dry tip phenomenon is prone to occur.
6, fertilization factors. In general, the plots with dry nitrogen, yellow leaves, dead seedlings and dead seedlings have higher yields, while the suitable nitrogen fertilizers have dry tips, dead seedlings and lower dead seedling rate.
7, the reason for the lack of. The lack of trace elements can also cause yellow leaves and dry-tip phenomena. If the plants are deficient in calcium and magnesium, they will cause dry and yellow leaves of garlic.
8. Other factors. Garlic emergence of root lice, blackhead mites, leaf blight, purple spot disease, blight, etc., or phytotoxicity can also cause, we can use excessive herbicide before emergence, so that leaf growth is inhibited, chlorotic and yellow, individual heart leaves Twisted, the root system is reduced, and the garlic becomes smaller.
Second, prevention measures
1. Pouring the green water. After the spring, the temperature began to rise and the seedlings began to grow. At this time, the watering of the garlic field depends on the condition of the soil. It is not too early to water in early spring. The number of watering should not be too diligent. It is to prevent the ground temperature from being lowered due to watering, which affects the early onset of garlic.
2. Spray in time. Garlic is usually manifested from the end of February to the beginning of March. The initial yellow leaf spots occur. The yellow tip is the end of the withdrawal. It indicates that the nutrients in the garlic are consumed and the nutrients are absorbed by the roots, but the ground temperature is generally low. The absorbed nutrients cannot meet the needs of the plants, so yellow tips will appear, so foliar application must be carried out in time.
3. Prevent pests and diseases in a timely manner. The main diseases are leaf blight, purple spot disease, root rot, and epidemic diseases. Insect pests should pay special attention to the control of garlic root lice and blackhead mites, because winter may cause the garlic to rot, causing the garlic to smell and attract the flies to lay eggs. And suffered.
The above is about the introduction of the spring garlic, the dry tip, the yellow leaf. If there are these characteristics in the garlic field, it can be controlled according to the method introduced by Xiaobian.
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