What is the reason for topping corn stalks?

A:

The topping of plants is for seed corn production. The tassels are removed so that plants can only be pollinated by other plants. The rows that are topped are females rows. Rows which are not are male rows. Pollen is produced on the tassel. This is the process of hybrid seed. Hybrid seed results in much better plant vigor and yield. Hybrid corn seed was first developed in the 1930's.  

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