At what growth stage is corn most vulnerable to hot temperatures and dry soils?

Corn is most vulnerable to hot temperatures and dry soils during the tasseling and pollination stage. This phase is critical because it is when the plant undergoes the reproductive process, which is particularly sensitive to environmental stressors. If temperatures are excessively high or if the soil becomes dry during this time, it can lead to poor pollination and subsequently reduce kernel formation, ultimately affecting yields significantly.

During tasseling, the plant is trying to develop its reproductive structures, and stress during this stage can disrupt the normal processes of fertilization. Hot conditions can lead to pollen scorching, where pollen viability decreases, and dry conditions can exacerbate water stress on the plant, impeding its ability to maintain optimal physiological functions. Therefore, ensuring adequate moisture and moderate temperatures during this phase is crucial for achieving a successful yield.