What causes yellow leaves and dried tips on garlic sprouts? 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 dish for seasoning. Their planting range and area are extremely wide, and their economic benefits are high. However, during cultivation, a phenomenon that troubles farmers appears, namely yellow leaves and dried tips, which seriously affects the quality of garlic sprouts and reduces economic benefits. So what causes yellow leaves and dried tips on garlic sprouts? How should they be controlled? Let's take a look at the detailed introduction from Qinong Web.
1. Continuous repeated cropping year after year
Continuous repeated cropping year after year causes pests and pathogens in the soil to accumulate continuously, leading to a higher incidence and greater severity of pests and diseases. In addition, the nutrients in the soil are continuously consumed, causing the plants to grow weakly, their stress resistance to the environment to decline, and the phenomenon of yellow leaves and dried tips to appear.
Control method: Reasonably rotate crops. During planting, do not rotate with crops such as scallions, ginger, and garlic. This can destroy the living environment of pests and pathogens, reduce the incidence and severity of pests and diseases. When planting, increase the application of organic fertilizer to maintain the organic elements in the soil and enable healthy growth.
2. Improper sowing time
Garlic is a crop that prefers cool conditions, with a suitable growth temperature of 12-16 degrees. As the global climate warms, the temperature at the previously suitable sowing time is constantly changing. Seedlings before winter become too large, nutrient consumption is excessive, yellow leaves and dried tips are likely to occur, the cold resistance of garlic sprouts decreases, they are prone to freezing damage, and they decline prematurely in spring.
Control method: Therefore, the previous sowing time should be delayed for a period. The specific time depends on the local climate. Generally, sowing is carried out when the temperature is around 20 degrees. If using a greenhouse and plastic film mulching, it should be delayed by about one week.
3. Pests and diseases
Garlic maggots are a common pest during garlic sprout cultivation and are also the main pest. They are saprophagous pests, and during damage, garlic sprouts are very prone to yellow leaves and dried tips. In addition, improper cultivation management leads to plant infection by diseases, producing yellow leaves, premature decline, and affecting yield and quality.
Control method: Garlic maggots mainly occur because farmyard manure applied to plants is not fully decomposed, and maggots reproduce 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 should also be paid to disease control work, 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 elements. During cultivation, a lack of fertility leads to insufficient plant nutrition and causes yellow leaves and dried 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 each time to avoid nutrient excess, which can also cause yellow leaves. Nitrogen, phosphorus, and potassium fertilizers should be used 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 and control methods of yellow leaves and dried tips on garlic sprouts brought to you by Qinong Web. We hope it can help you. If you want to learn more related knowledge, please stay tuned to Qinong Web.