Which of the following is NOT a record that the farmer should keep?

Annual fertilizer costs are indeed important for farmers to track as they impact the overall profitability and management of their agricultural operations. This record helps in determining the effectiveness of different nutrients applied and aids in financial planning for future seasons.

In contrast, annual crop yields, copies of completed Manure Export Sheets, and the amount of manure used on the operation provide crucial insights into production practices, nutrient management effectiveness, and compliance with nutrient regulations. These records enable the farmer to evaluate the impact of nutrient applications on crop production, ensure proper legal documentation for manure management, and track nutrient inputs, all of which contribute to sustainable farming practices and environmental stewardship. Therefore, maintaining detailed records of these factors is essential in the context of nutrient management.