Calculate the harvest yield in bushels per acre. grain yield (bu/A) = Calculating the estimate Once estimates of the number of heads per square foot, seeds per head and seed weight have been established, they can be combined using Equation 2 to produce an estimated yield potential. Example: (43.5 ears x 6 inches x 15.3 rows) divided by 30-inch rows = 133 bu/ac yield estimate. G = 0 all grain yield originates from the reserves avail-able at anthesis. The method in the UW study obtained silage yield at the appropriate harvest stage for silage and left the remainder of the plot to full maturity for measuring grain yield. The interactive form is designed to analyze sample data for up to five sample areas, with a minimum of six ear samples per area. The ‘726’ value in Equation 2 is a constant that results from simplifying the equation. Using such estimates will potentially result in a less accurate yield prediction. Silage yield can explain about 70% of the variation in grain per ton. For each hand-harvested ear sample, multiply the number of rows Use the interactive grain yield calculator in the Appendix to analyze your field data. Asf G increases the relative contribution of reserves to yield decreases Fig. As is the case in the formula for estimating grain yield, the known constant will be different as the grain weight varies. Use of the following formula prior to grain development will require the use of estimates, such as the average number of kernels per head. Calculate the number of kernels per ear. Plant physiology indicates that some increase in grain yield … The canola calculator also includes a simple formula for estimating potential yield before pod formation. Grain yield for the sampling area is calculated by multiplying the average ear count by the average ear length by the average kernel row number, then dividing by the row spacing. Calculating Bushels/acre To calculate bushels per acre the basic formula is: Bushels/acre = (Harvested dry matter lbs) ÷ Standard lbs/bushel ÷ plot area acres or Yield = “A” lbs ÷ “B” lbs/bushel ÷ “C” acres Calculating “A” Corn Grain Yield Calculator. May 22, 2018 To get an estimate of wheat yields after wheat heads develop, Joel Ransom, North Dakota State University Extension agronomist, suggests using the Wheat Quality Council’s formula. Despite these potential errors, the formula provides a reasonable estimate for potential grain yield in Nebraska winter wheat. Hypothetically, when f G = 1 (all growth occurred after anthesis) then HI P =1. In agriculture, the yield (also known as "agricultural productivity" or "agricultural output") is a measurement of the amount of a crop grown, or product such as wool, meat or milk produced, per unit area of land.The seed ratio is another way of calculating agricultural productivity.. Formula for estimating yield loss. 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