Which of the following best describes soil testing?

Soil testing is primarily aimed at assessing the nutrient requirements of the soil. This process involves collecting soil samples and analyzing them for nutrient content, pH levels, and other important factors that influence soil health and crop productivity. Understanding the nutrient profile of the soil allows farmers and agronomists to make informed decisions on fertilization, crop selection, and soil management practices, leading to improved yield and sustainable practices.

The other options focus on unrelated concepts. Measuring atmospheric CO2 levels pertains to environmental studies and does not provide information about soil health. Boosting crop resilience is more about plant breeding and management practices rather than direct evaluation of the soil. Evaluating labor costs in farming is an economic assessment not connected to the soil's nutrient content or health. Soil testing plays a critical role in agriculture management by ensuring that crops receive the necessary nutrients for optimal growth.