What is one of the advantages of having a northeast-southwest orientation for greenhouses?

A northeast-southwest orientation for greenhouses is particularly advantageous because it allows for optimal exposure to sunlight throughout the day. By positioning the greenhouse in this way, the longer sides face east and west, which maximizes surface area for sunlight to penetrate during morning and afternoon hours. This exposure is crucial for plant growth, as adequate sunlight supports photosynthesis and enhances plant vitality.

In contrast, orientations that do not align with the sun's path may limit light entry, potentially leading to inadequate growing conditions. While the other options present various benefits for greenhouse management, such as reducing wind exposure or minimizing humidity, these are not directly tied to sunlight exposure and do not provide the same level of advantage for plant growth as maximizing sunlight does. Thus, increasing exposure to sunlight is the primary benefit of a northeast-southwest orientation.