A study of Haldimand County (Ontario, Canada) farmers' use and understanding of soil test reports and the relationship of these variables with certain personal and social characteristics of the respondents are summarized. The objectives of the study were to indicate the extent to which farmers use the soil test report, the quality of fertilizer treatment changes made compared to those suggested, and farmers' understanding of information contained in the report. Data were collected by personal interview of the 95 Haldiman County farmers who had received a soil test report during the year ending June 30, 1971. The data obtained were computer processed. A summary of the findings shows that the farmers with the least understanding of the soil test report's fertilizer requirement section included a higher proportion of those with the least education, the smallest farms, the smallest farm income, and did not attend agricultural meetings or activities organized by the county extension workers. It is concluded that the provision for improvement in the quality of soil test information such as that reaching farmers through the fertilizer trade, key farmers, and other personal information sources, could provide a challenge to extension workers. Appendix tables provide the statistical data. (DB)