What is the effect of a sight gauge during fertilizer application?

The correct answer is that a sight gauge allows measurement of tank liquid levels. In fertilizer application, it is crucial to know the amount of liquid fertilizer remaining in the tank to ensure that areas are adequately covered and to prevent running out of fertilizer during application. The sight gauge provides a visual indicator of liquid levels, helping operators manage their application more effectively and maintain consistency in their work.

This tool enhances operational efficiency by allowing the operator to quickly assess the tank's contents without having to open or physically check the tank, which could be time-consuming or messy. Understanding the precise level of fertilizer available aids in planning the application process and can contribute to preventing over-application or under-application.

The other options, while they may seem relevant, do not directly relate to the primary function of a sight gauge in the context of fertilizer application.