Godsey Ag

Yield Map


Yield monitor data serves two main purposes: 1) enables evaluation of current year’s management and 2) provides data for future years in regards to how management could be altered to increase yields and/or decrease input costs. Carefully evaluating yield data at the end of the year provides an insight on major problems such as pest pressure, irregular sprinkler patterns, compaction, etc. In addition to these items, yield monitor data can be used for on-farm testing. Yield data makes it easy to evaluate treatments that were imposed during the growing season. On-farm testing should be a key component of any producer who uses precision ag. technologies.

The most powerful use of yield data is when multiple years of data are combined in order to determine management practices that will increase yields or decrease input costs. There is no better method in delineating management zones than through using yield data history. Multiple year yield analysis will define areas that are consistently high, medium, or low averaging. Also, it will identify areas that are inconsistent from year to year. This information can be used in regards to seed, fertilizer, and other inputs. Even in years when you do not plan to make any variable rate applications or use different seeding rates collecting yield data is important for the future. Ideally, a producer would have at least three years of yield data before delineating management zones or making other input decisions. Decisions can be made with less data but may not be as precise.

Yield data analysis at the end of the year is important and time should be spent analyzing data. Erroneous data points either high or low should be deleted. Also, points associated with turnarounds within the field should be removed. Obtaining good yield data each year is critical in getting the most out of precision ag. technologies.

The above figure on the left is relative or normalized grain yield over a 4 year period. Yellow area is 95 -105% of the field average for the time period. The middle figure is a measure of the yield stability from year to year. The lightest purple area is very stable. The figure on the right is using the information in the first two figures to generate management zones.

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