N.Y. Agriculture & Markets Law § 304-A
4. a. The base agricultural assessment value shall be the average capitalized value of production per acre for the eight year period ending in the second year preceding the year for which the agricultural assessment values are certified. The capitalized value of production per acre shall be calculated by dividing the product of the value of production per acre and the percentage of net profit by a capitalization rate of ten percent, representing an assumed investment return rate of eight percent and an assumed real property tax rate of two percent. b. The value of production per acre shall be the value of production divided by the number of acres harvested in New York state. c. The percentage of net profit shall be adjusted net farm income divided by realized gross farm income.