Pre-Harvest Corn Yield (Yield Component Method)

Weeks before harvest (the yield component / ear-count method). Count the ears in 1/1000 acre (17 ft 5 in of a 30-in row), then on a representative ear the kernel ROWS around and the kernels per row. bu/ac = ears x (rows around x kernels per row) / factor, where factor = thousands of kernels per 56-lb bushel, ~90 average, 75-80 big kernels (raises the estimate), 95-100 small. 32 ears x 16 x 35 / 90 = 199 bu/ac; a thinner 28-ear, 480-kernel stand ~149. Average several counts across the field and pick representative ears; roughest before kernels finish filling (R5-R6). A pre-harvest estimate; the harvested, moisture-corrected yield (crop-yield) is the real number, and the combine and scale govern.

kernels_per_ear = kernel_rows_around x kernels_per_row; bushels_per_acre = ears_per_thousandth_acre x kernels_per_ear / kernel_factor. Ears counted in 1/1000 acre (17.5 ft of 30-in row); kernel_factor = thousands of kernels per 56-lb bushel (~90).

Pre-harvest corn yield, the yield component (ear-count) method (Purdue / Iowa State University Extension), by name; the harvested and moisture-corrected yield is the real number, and the combine and scale govern.

The yield component method is public extension-service agronomy; the ear count, kernel rows, kernels per row, and kernel factor are the field's counts.

Estimate. AHJ and licensed professional govern.

Field names used by the API: ears_per_thousandth_acre, kernel_rows_around, kernels_per_row, kernel_factor, kernels_per_ear, bushels_per_acre

• Yield component method bu/ac = ears (per 1/1000 acre) x (rows around x kernels per row) / factor; count ears in 17.5 ft of 30-in rowPurdue / Iowa State Extension
• Kernel factor factor = thousands of kernels per 56-lb bushel: ~90 average, 75-80 big kernels (raises estimate), 95-100 small; roughest before R6 black layercorn yield-estimation agronomy