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Corn Chemical Control Prevents Production and Increases Production
In recent years, corn lodging has become a common issue in many production areas. There are three main types of lodging: stem lodging, root lodging, and stem inversion. From my understanding, the primary causes of widespread corn lodging include improper fertilization practices, incorrect timing of fertilizer application, and overly dense planting. First, excessive use of nitrogen fertilizer leads to excessive vegetative growth, making the plants weak and prone to lodging. Second, applying fertilizer at the wrong time—especially failing to provide sufficient nutrients during the jointing stage—can result in elongated and thin stalks. Third, high planting density often leads to poor air circulation and increased susceptibility to lodging. In addition, extreme weather conditions such as heavy rain and strong winds can also contribute to this problem.
In China, the application of chemical control techniques has proven effective in improving corn resilience against lodging. These methods help strengthen the stalks, promote a more developed root system, and enhance the plant's ability to resist lodging. At the same time, they improve leaf color, increase leaf thickness, boost chlorophyll content, and enhance photosynthetic efficiency. The overall plant height is reduced by about 10-15 cm, the ear position is lowered by 10-12 cm, and the internodes are shortened, resulting in an ideal high-yield plant with better ventilation and light penetration. This approach also improves drought tolerance, disease resistance, and promotes reproductive growth, leading to larger kernels, higher grain weight, and a lower baldness rate. It allows for an increase in planting density by 200-400 plants per acre, with yield increases typically ranging from 15% to 30%, effectively achieving the goal of "high yield with dense planting."
When using chemical control agents, there are several important considerations. First, these products are most suitable for medium- to late-maturing varieties grown on well-fertilized fields. They should not be used on low-yield or poorly developed fields, especially those with insufficient biomass due to previous crop failures. Second, it is crucial to strictly follow the recommended spraying schedule and concentration levels. Repeated spraying or spraying the entire plant should be avoided. Third, chemical control agents should not be mixed with fertilizers or pesticides. Before and after spraying, equipment must be thoroughly cleaned with clean water.
Timing is critical for the effectiveness of chemical control. The optimal period for spraying is when the corn has 6 to 13 leaves, with the best results achieved between 8 and 13 leaves. To determine the right time in practice, a simple trick can be used: before the 6-leaf stage, the leaves are long and smooth. Once the plant reaches the 7-leaf stage, the leaves become thicker, and small white hairs appear on their surface, which can be easily felt with the back of your hand. This is the ideal time for application.
The principle for spraying is simple: "Spray high, not low; spray moderately, not strongly; spray until black, not yellow." For fields with high fertility or tall stalks, the dosage should be adjusted accordingly. By following these guidelines, farmers can maximize the benefits of chemical control while minimizing risks.
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