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Wider plots reduce the shading affect tall hybrids have on short hybrids, providing more accurate testing, DeVillez said. We were really, really satisfied with the quality of the data and the performance of all the hybrids. Purdue Corn Trial Bulletin Released. Suggested Event. Jan 19, to Jan 21, Hide comments. More information about text formats.
Text format Comments Plain text. Web page addresses and e-mail addresses turn into links automatically. Lines and paragraphs break automatically. Within each trial, hybrids are ranked by moisture, averaged over all trials conducted in that zone during Yield data for both and are provided if the hybrid was entered previously in the trials. Starting in , a nearest neighbor analysis of variance for all trials as described by Yang et al.
A hybrid index Table 2 lists relative maturity ratings, specialty traits, seed treatments and production zones tested for each hybrid.
Seed companies use different methods and standards to classify or rate the maturity of corn hybrids. To provide corn producers a "standard" maturity comparison for the hybrids evaluated, the average grain or silage moisture of all hybrids rated by the company relative maturity rating system are shown in each table as shaded rows.
In these Wisconsin results tables, hybrids with lower moisture than a particular relative maturity average are likely to be earlier than that relative maturity, while those with higher grain moisture are most likely later in relative maturity. Company relative maturity ratings are rounded to 5-day increments. The Wisconsin Relative Maturity rating system for grain GRM and silage SRM compares harvest moisture of a grain or silage hybrid to the average moisture of company ratings using linear regression.
Each hybrid is rated within the trial and averaged over all trials in a zone. Three factors-yield, moisture, and standability-are of primary importance in evaluating and selecting corn hybrids. A performance index P. This performance index evaluates yield, moisture, and lodged stalks at a 50 yield : 35 moisture : 15 lodged stalks ratio.
The performance index was computed by converting the yield, moisture dry matter , and upright stalk values of each hybrid to a percentage of the test average. Then the performance index for each hybrid that appears in the tables was calculated as follows:.
Performance Index P. Corn silage quality was analyzed using near infra-red spectroscopy equations derived from previous work. Spectral groups and outliers were checked using wet chemistry analysis. In MILK, the energy content of corn silage was estimated using a modification of a published summative energy equation Weiss and co-workers, ; Animal Feed Science Technology In the modified summative equation, CP, fat, NDF, starch, and sugar plus organic acid fractions were included along with their corresponding total-tract digestibility coefficients for estimating the energy content of corn silage.
Digestibility coefficients used for the CP, fat, and sugar plus organic acid fractions were constants. Using National Research Council NRC, energy requirements, the intake of energy from corn silage was converted to expected milk per ton.
Milk per acre was calculated using milk per ton and dry matter yield per acre estimates Schwab, Shaver, Lauer, and Coors, ; Animal Feed and Science Technology Variations in yield and other characteristics occur because of variations in soil and growing conditions that lower the precision of the results.
Statistical analysis makes it possible to determine, with known probabilities of error, whether a difference is real or whether it might have occurred by chance. Use the appropriate LSD least significant difference value at the bottom of the tables to determine true differences. Where the difference between two selected hybrids within a column is equal to or greater than the LSD value at the bottom of the column, you can be sure in nine out of ten chances that there is a real difference between the two hybrid averages.
If the difference is less than the LSD value, the difference may still be real, but the experiment has produced no evidence of real differences. The results can be used to provide producers with an independent, objective evaluation of performance of unfamiliar hybrids, promoted by seed company sales representatives, compared to competitive hybrids.
Below are suggested steps to follow for selecting top-performing hybrids for next year using these trial results:. You are taking a tremendous gamble if you make hybrid selection decisions based on yield comparisons in only one or two local test plots.
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Then the performance index for each hybrid that appears in the tables was calculated as follows: Performance Index P. Below are suggested steps to follow for selecting top-performing hybrids for next year using these trial results: Use multi-location average data in shaded areas.
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