Why do garlic sprouts turn yellow with dry tips? Causes and control methods
Garlic sprouts are a common vegetable and seasoning in daily life. They have a rich aroma and are often used as a side ingredient for flavoring. They are grown across a very wide range and area, with high economic returns. However, during cultivation a problem arises that troubles farmers: yellow leaves and dry tips, which seriously affect the quality of garlic sprouts and reduce economic returns. So what causes yellow leaves and dry tips in garlic sprouts? How should they be controlled? Let's take a look at the detailed introduction from Qinnongwang.
1. Continuous repeated cropping on the same field
Continuous repeated cropping on the same field causes pests and pathogens in the soil to accumulate continuously, leading to a higher incidence and greater severity of pests and diseases. In addition, nutrients in the soil are continuously consumed, causing the plants to grow weakly, their resistance to adverse conditions to decline, and yellow leaves and dry tips to appear.
Control method: Reasonably rotate crops, and do not rotate with crops such as scallions, ginger and garlic during planting. This can destroy the living environment of pests and pathogens and reduce the incidence and severity of pests and diseases. When planting, increase the application of organic fertilizer to maintain organic elements in the soil so that the plants grow robustly.
2. Improper sowing time
Garlic is a crop that prefers cool conditions, with a suitable growing temperature of 12-16 degrees. As the global climate warms, the previously suitable sowing time and temperature are constantly changing. If seedlings are too large before winter, nutrient consumption is excessive, making yellow leaves and dry tips likely, the cold resistance of garlic sprouts decreases, they are prone to freezing damage, and they decline early in spring.
Control method: Therefore, the previous sowing time should be pushed back by a period. The specific time depends on the local climate. Generally, sowing is done when the temperature is around 20 degrees. If using a greenhouse or plastic film mulching, it should be delayed by about one week.
3. Pests and diseases
Garlic maggots are a common and major insect pest during garlic sprout cultivation. They are saprophagous pests, and when they cause damage, garlic sprouts are very prone to yellow leaves and dry tips. In addition, improper cultivation management can cause plants to become infected with diseases, producing yellow leaves and early decline, affecting yield and quality.
Control method: Garlic maggots mainly occur because farmyard manure applied to plants is not fully decomposed, and the maggots breed and grow in it, then harm the plants. Therefore, the best control method is to ensure that farmyard manure is fully decomposed before application. In addition, attention must also be paid to disease control, and diseases should be treated promptly when found.
4. Lack of nutrients
Garlic sprouts have a relatively shallow root system and weak absorption capacity, so they have high requirements for soil fertility, especially nitrogen and potassium. During cultivation, a lack of fertility leads to insufficient plant nutrition and causes yellow leaves and dry tips.
Control method: Fertilize reasonably. When fertilizing, mainly use organic fertilizer or farmyard manure, with chemical fertilizer as a supplement. Do not apply too much at one time, to avoid nutrient excess, which can also cause yellow leaves. Use nitrogen, phosphorus and potassium fertilizers in a reasonable combination. Apply sufficient base fertilizer before sowing. Generally, apply 4000-5000 kg of farmyard manure per mu, combined with 50 kg of phosphate fertilizer, 30 kg of potassium fertilizer and 20 kg of urea. Later, topdress reasonably according to plant growth conditions. If yellow leaves are found, spraying foliar fertilizer can achieve an excellent effect.
The above are the causes of yellow leaves and dry tips in garlic sprouts and their control methods brought to you by Qinnongwang. We hope it can help you. To learn more related knowledge, please stay tuned to Qinnongwang.