Summer corn seedlings must be "five"
First, inspect and fill in the seedlings. To ensure uniform growth of the seedlings, it's important to check them regularly before transplanting. If some areas are lacking, you can supplement with early-maturing varieties or transplants on a cloudy day or in the late afternoon. When maize has 3-4 leaves, it's time to thin them out, and when they have 5-6 leaves, it's the right time for final thinning. Remove weak, diseased, or small seedlings, and keep only those that are healthy and of similar size to promote even growth.
Second, cultivate regularly to control weeds. It's recommended to cultivate the field 2-3 times during the seedling stage. Initially, the cultivation should be shallow, about 5 cm deep. Before the plant starts jointing, cultivate 1-2 times to encourage deeper root development, with a depth of around 10 cm. Cultivate between the rows more deeply, but keep it shallow near the plants. Chemical weed control can also be used to enhance effectiveness.
Third, monitor and manage insect pests. Regularly remove weeds from the field to reduce pest habitats. This helps prevent locusts and other harmful insects. In mid to late June, corn thrips may attack the heart and leaves of the plant, causing leaf distortion and silver-white streaks. Severe infestations can lead to yellowing and death of the inner leaves, so early intervention is essential.
Fourth, apply uneven fertilization to help weak plants catch up. If some seedlings are weaker than others, take immediate action. Perform individual management by applying extra fertilizer to these plants to help them grow faster and match the height of the rest. This prevents issues like poor ear development or empty stalks due to canopy closure later on. A common practice is to apply 5-10 kg of nitrogen fertilizer per 667 square meters, placing it near the base of the plant and loosening the soil immediately after application.
Fifth, combine irrigation and drainage for disease prevention. Maize seedlings are relatively drought-tolerant and usually don’t require frequent watering unless there's severe dryness. However, proper drainage is crucial, especially after heavy rains. Excess water can damage the stems, leaves, and roots, leading to seedling death. Pay special attention to fields with poor drainage. Regularly loosen the soil and improve air circulation to prevent diseases caused by moisture buildup.
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