Which is NOT a part of assessing farm performance metrics?

In the context of assessing farm performance metrics, employee turnover rates are not typically included as a direct performance measure related to the operational efficiency or productivity of the farm itself. Performance metrics primarily focus on financial and operational aspects that directly impact the farm's profitability and productivity.

Yield per acre helps evaluate how effectively land is being utilized to produce crops, providing insights into agricultural productivity. Cost-efficiency ratios allow farmers to assess how well they are managing expenses relative to their outputs, giving a clear view of financial health and operational performance. Return on investment (ROI) is a critical metric that measures the profitability of investments made in the farm, helping in decision-making regarding resource allocation and investment strategies.

While employee turnover can reflect workplace culture and management practices, it does not directly assess the farm's performance in terms of production or financial metrics. Therefore, employee turnover rates stand apart as they pertain more to human resources management rather than the core operational or financial performance measures essential for evaluating agricultural success.