The length of the corn axis is normal, but a portion of the axis is exposed and not wrapped by the bracts. Some plots have bracts that are only one-third of the length of fruit ears; Some plots have bracts that reach half the length of the fruit ear. There are basically no grains on the exposed axis. So, why is corn topping? How to prevent and control corn topping?
Reasons for corn topping
1. Drought and water scarcity
During the jointing period of corn, encountering high temperature and drought can easily lead to asynchronous differentiation of bracts and ears, resulting in short bracts and exposed tops.
2. Climate impact
Long term rainy weather, insufficient light and temperature, reduced photosynthesis, resulting in slow and insufficient growth of bracts.
3. Planting too densely
Planting too densely, with insufficient ventilation and light in the field, affects the normal growth of corn and leads to the phenomenon of outcrop
4. Pharmaceutical reasons
Spraying chemical control agents or triazole like agents before tasseling can also cause asynchronous development of bracts and ears.
5. Boron deficiency in soil
When boron deficiency occurs, it can affect the formation of maize male flower pollen and its activity during pollination, resulting in the phenomenon of outcropping.
Prevention and control of corn outcrop
Scientific use of chemical control agents
Strictly follow the instructions to prepare the solution, do not increase the concentration of the solution without authorization, and master the spraying period and method. Do not spray again or miss, and avoid mixing with alkaline pesticides and fertilizers.
Early application of ear fertilizer
When the soil fertility is high and the base and mouth fertilizers are sufficient, topdressing with ear fertilizer can be done 7-10 days before heading. It is beneficial for extending the leaf functional period in the later stage of growth, and also plays an important role in increasing the number of grains per spike and increasing the weight of 1000 grains.
