First, water management is crucial for spring radishes. It's important to ensure proper drainage in the field to prevent waterlogging and reduce soil moisture. During the growth period, watering is generally not necessary. Only when the soil in the furrows turns white should you consider watering. However, during the root development stage, the radish requires more water. In such cases, drip irrigation is recommended as it allows the soil to absorb moisture effectively. If using furrow irrigation, it's best to do so during midday on sunny days. After filling the furrows with water, make sure to drain the excess for about two hours to avoid over-saturation.
To provide adequate nutrients during the middle and late stages of growth, fertilization should be done in two separate applications. The first application should take place about 30 days after sowing, when most of the radish has started to show its shoulder. Mix 25 kg of compound fertilizer with 0.5 kg of liquid fertilizer at this stage. The second application should occur around 45 days after sowing, using the same amount as the first. If the soil is moist, apply the top dressing about 10 cm away from the radish roots to avoid direct contact and potential damage.
Second, pest and disease control is essential for healthy growth. Common pests include aphids and cabbage caterpillars. These can be managed by spraying insecticides such as imidacloprid, insecticidal soap, or dichlorvos on the underside of the leaves. For diseases like downy mildew and black rot, crop rotation and good air circulation are effective preventive measures. If chemical treatments are needed, alternately spray mancozeb or other fungicides to control downy mildew. For black rot, antibiotics like agricultural streptomycin or copper-based solutions can be used for irrigation. Regular monitoring and timely intervention are key to maintaining a healthy crop.
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