Matters needing attention in planting garlic

The price of garlic is very good in recent years, and the majority of garlic farmers have a high enthusiasm for growing garlic, and they all want to grow high-quality and high-yield garlic, but in the process of production, it is often found that some garlic leaves turn yellow seriously in spring, which affects the photosynthesis of garlic and finally restricts the increase of garlic production. What is the reason for the serious yellowing of garlic leaves in spring? Today, we will take you to learn more about the causes and prevention measures of garlic leaves yellowing in spring.

Climatic reasons

Garlic is a cold vegetable, and the suitable temperature for stem and leaf growth is 12-16 ℃. When the air temperature is above 26 ℃, the leaves breathe vigorously, water transpiration is large, and nutrients are consumed more. At this time, yellow leaves are produced at the top of the upper leaves of the plant, which gradually develops from the leaf tip to the base, and then the dry tip appears. In case of hot and dry wind, the harm to the leaves is more serious, the earlier the occurrence, the more serious the harm. In recent years, due to the global warming, especially the high temperature before winter, garlic is still sown according to the original sowing date, the seedlings are too large before winter, the nutrient consumption is too large, the dry tip of yellow leaves is serious, the cold tolerance is reduced, it is vulnerable to freezing injury, and premature senescence in spring.

Measures: sowing at the right time. The sowing date of garlic should be postponed, and the sowing time of garlic covered with plastic film could be delayed by 7-10 days when the local daily average temperature was 20-22 ℃.

Excessive fertilization

The results show that when the amount of fertilizer per mu of garlic is more than 150kg, the concentration of soil solution will be too high, which will seriously affect the absorptive capacity of garlic roots.

Measures: the principle of applying a small amount of fertilizer for many times should be adopted, and the suitable base fertilizer should be 80-100kg.

Soil consolidation

There are many reasons for soil consolidation, but there are two main reasons. On the one hand, the amount of farm manure is reduced or even not used, resulting in a serious shortage of soil organic matter and aggravating soil consolidation; on the other hand, due to the use of rotary ploughing, the tillage layer is too shallow, and the lower layer of soil is seriously hardened, which makes it difficult to infiltrate water after rain or watering, resulting in fertilizer can not penetrate into the lower layer in time, resulting in root burning near the garlic root system.

Measures: because the sandy soil is permeable, the phenomenon of root burning can be alleviated by watering. Clayey soil needs to increase the application of organic fertilizer and plough deeply every 2-3 years to break the bottom of the soil plough.

Serious continuous cropping

Continuous cropping is mainly caused by planting garlic for years. After planting garlic for many years, bacteria and pests will be enriched in the soil, which will harm the normal growth of garlic, such as Fusarium wilt, root rot and other harmful bacteria.

Measures: the most effective measure to solve crop succession is to change crops, which we often say, but many growers do not like to change crops for various reasons, so they can only re-apply bio-organic fertilizer when applying fertilizer to improve the growth environment of garlic. improve plant resistance.

Garlic degeneration and virus disease

Due to the asexual propagation of garlic cloves for a long time, garlic degenerates, reduces its growth potential, reduces its ability to resist diseases and adapt to adverse environment, and produces yellow leaves and premature senescence if it encounters improper cultivation measures. seriously affect the yield and quality of garlic moss and garlic.

Measures: optimize the species of garlic, purify and rejuvenate. The nutrition of garlic in the seedling stage from germination to pre-winter mainly comes from the mother valve, therefore, in the selection of seed cloves, we should choose large cloves with large cloves, complete bottom buds, strong top buds, white color, no wound, disease-free spots, and more than 5 grams; we should also introduce excellent varieties of virus-free garlic in a planned way; establish garlic seed fields or propagate with aerial scale buds to restore seed character, improve vitality, or cultivate virus-free garlic.