Summer corn seedlings must be "five"
First, inspect and fill in seedlings. To ensure uniform growth of the seedlings, it's important to check them regularly before transplanting. If some areas have poor germination or weak seedlings, it's best to supplement with early-maturing varieties. This should be done in the late afternoon or on cloudy days to reduce stress on the plants. When maize has 3-4 leaves, it's time to thin out the seedlings. At 5-6 leaves, perform final thinning by removing weak, diseased, or stunted plants, keeping only those that are healthy and of similar size.
Second, cultivate regularly to control weeds. It's recommended to cultivate the field 2-3 times during the early growth stage. Initially, keep the cultivation shallow—about 5 cm deep. Before the plant reaches the jointing stage, cultivate 1-2 more times to encourage deeper root development. At this point, the depth should be around 10 cm, with deeper cultivation between rows and shallower near the seedlings. In addition, consider using herbicides as a supplementary method for weed control.
Third, monitor and manage pests. Regularly remove weeds from the field to prevent pest infestations. Pay special attention to locusts and grasshoppers. Corn thrips often appear in mid to late June, feeding on the heart and leaves of the plant. This can cause leaf distortion, silver-white streaks, and in severe cases, yellowing and death of the central leaves. Early detection and intervention are crucial to avoid significant damage.
Fourth, apply uneven fertilizer to support weak seedlings. If certain plants are lagging behind, take immediate action. Implement individual plant management to help weaker plants catch up in height. This prevents issues like poor canopy closure, which can lead to empty stalks, small ears, or barren kernels. A common practice is to apply an uneven fertilizer, using 5–10 kg of nitrogen per 667 square meters. Apply the fertilizer near the base of the plant and loosen the soil immediately after to improve nutrient absorption.
Fifth, combine irrigation and drainage for optimal growth. Maize seedlings are relatively drought-tolerant and usually don’t require frequent watering unless there's severe dryness. However, proper drainage is essential, especially during heavy rains. Excess water can damage the stems, leaves, and roots, leading to plant death. This is particularly important in poorly drained or low-quality soils. After rain, ensure the field is well-drained, aerated, and ventilated to prevent diseases caused by moisture buildup.
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