**ISSUE 14 August 3, 2000**

ESTIMATE CORN YIELDS IN YOUR FIELDS

With silking finished on corn that is progressing in a timely
fashion in order to mature before the average frost date, estimates of the relative grain
yield can be done. First, count the number of harvestable ears per 1/1000^{th} of
an acre. With 30-inch rows that is a row length of 17 feet, 5 inches and with 22-inch rows
count the number of ears down 23 feet, 9 inches of a row to determine the estimate. Within
this ear count area, also count the number of kernel rows on the ears of every fifth
plant. Also, count the number of kernels per row on these same ears. Remember to only
count kernels that are developing well (do not count kernels on the tip that are less than
half the size of those mid-way up the ear). Average the total number of ear rows counted
within the area, then separately average the total number of kernels per row within the
area. If possible, move to various areas of the field and repeat the above estimations and
average your findings. Next use the following formula to determine yield:

Remember, this estimate of relative grain yield will be underestimated in a year with good grain fill conditions.

Denise McWilliams

Extension Crop Production Specialist

dmcwilli@ndsuext.nodak.edu