Which of the following is the proper humidity level to stop onion neck rot?

To effectively prevent onion neck rot, maintaining a humidity level around 75 percent is crucial. At this humidity level, the moisture balance in the air helps reduce the incidence of fungal diseases that can lead to rotting in onion necks.

Too low humidity, such as 35 percent or 50 percent, could lead to excessive drying out of the onions, making them more prone to damage and disease invasion. On the other hand, a humidity level of 80 percent may create an environment that is overly moist, increasing the risk of mold and rot rather than preventing it. Thus, the optimal humidity of approximately 75 percent strikes the right balance for preserving the health of the onions during storage, effectively staving off neck rot.