Symptoms: The green onions grow too vigorously, the scallion is broken, the leaves are lodging, the lodging lasts for a long time, and the lower leaves turn yellow or rot.
Cause: Planting is too dense. In the summer and autumn, there are many rains or excessive watering, and the base fertilizer is sufficient. The leaves grow rapidly and luxuriantly, and the soil is not timely, causing the leaves to be top-heavy and windy.
Control measures: base fertilizer according to formula, not biased with nitrogen fertilizer, topdressing should be timely and appropriate, not too much; into the rainy season, try to control watering, timely drainage after rain, less topdressing, timely soil; green onions best north and south ridge planting, reduce leaves The adverse effects of light growth. In addition, according to the characteristics of the local summer and autumn popular monsoon, the ridge direction is appropriately adjusted, and planting in the downwind direction can also reduce the risk of lodging. (He Yongmei)
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