Which of the following is NOT a common abiotic agent affecting turfgrass?

The correct choice is based on the classification of agents that affect turfgrass health. An abiotic agent refers to non-living environmental factors that can impact plant growth, such as chemicals, physical conditions, and natural phenomena. In this context, dollar spot is a common turfgrass disease caused by a fungus, making it a biotic factor rather than abiotic.

Animal urine, fertilizer damage, and petroleum spills are all abiotic agents that can have detrimental effects on turfgrass. Animal urine can lead to localized death or discoloration of grass due to high concentrations of nitrogen and salts. Fertilizer damage can result from over-application or improper application of chemical fertilizers, causing harm to the turfgrass. Petroleum spills can disrupt soil composition and adversely affect the growth and health of plants, including turfgrass.

Understanding the distinction between biotic and abiotic agents is crucial for effective turf management and maintaining healthy grass.