Which factors are important for determining the correct spacing of crops in a greenhouse?

The correct choice emphasizes the importance of airflow and resource competition when determining the spacing of crops in a greenhouse. Proper spacing is crucial for facilitating adequate airflow around plants, which helps in preventing diseases and promoting healthy growth. Good airflow can reduce humidity levels, minimizing the risk of fungal infections and other issues that thrive in stagnant air.

Additionally, spacing affects resource competition among plants for light, water, and nutrients. When crops are spaced too closely together, they may compete intensely for these essential resources, leading to stunted growth or reduced yields. Conversely, optimal spacing allows each plant to access adequate resources without excessive competition, promoting a healthier greenhouse environment and maximizing productivity.

While factors like temperature and humidity are significant in overall greenhouse management, they primarily influence plant growth conditions rather than specifically addressing spacing. Sunlight and rainfall are more relevant to outdoor farming situations, and pest exposure and water access are important considerations but do not directly relate to the determination of spacing in the same way as airflow and competition for resources do.