How to Estimate Plant Populations Per Acre By Dr. Harold Willis An accurate estimate of plant population per acre can be obtained by counting the number of stalks in a length of row equal to 1/1000 of an acre. Make at least three counts in separate parts of the cornfield, figure the average of these samples, and then multiple this number times one thousand. How to estimate plant populations per acre. Source: Ask the Plant SUPPORT ECO-AGRICULTURE INFORMATION FOR THE WORLD The freedom to pass information between generations, communities and neighbors is one of the foundations of regenerative agriculture. This is why the educational leaders at Acres U.S.A., founded in 1971, created EcoFarmingDaily.com: a free tool for farmers, ranchers and growers to learn specific tactics related to their trade. Make a Donation For tax deductible donations, click here.