What would the planet breeder need to do to make sure he always produces corn with short stalks and a high mass of grain?

To consistently produce corn with short stalks and high grain mass, the breeder should select parent plants that exhibit these desired traits and perform selective breeding over multiple generations. This involves cross-pollinating individuals with the best characteristics and carefully evaluating their offspring. Additionally, the breeder may employ techniques such as genetic markers and controlled environment conditions to enhance and stabilize these traits. Regular evaluation and adjustment of breeding strategies based on phenotypic performance will also be essential for success.