Germplasm Enhancement of Maize

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Data Form
GEM Location Map
11 Yield Trial Data
10 Yield Trial Data
09 Yield Trial Data
08 Yield Trial Data
07 Yield Trial Data
06 Yield Trial Data
05 Yield Trial Data
04 Yield Trial Data
03 Yield Trial Data
02 Yield Trial Data
01 Yield Trial Data
00 Yield Trial Data
99 Yield Trial Data


I. Data communication form for GEM yield trials:

Each year, GEM cooperators send the yield trial data back to the GEM data manager. Please click here to see the format we prefer you to use. Thank you for your cooperation.

II. GEM yield trial location map:

In year 2004, GEM staff and GEM cooperators conducted 38 yield trial experiments in 86 locations (10 states). If you want to know the locations of them, please click here to see the location map. It's not as accurate as it should be, but it gives you a general idea where the GEM yield trials are located.

III. Numbering Scheme: Numerical characters are used for naming the yield trial tests. The first 2 number for year (99 for year 1999). The third digit is for homologous area (1=tropical, 5=temperate, and 6=both). The fourth digit is for %exotic (2=2 way cross - 50% exotic, 3=3 way cross - 25% exotic, 0=both, and 4=other). The last 1 or 2 digits are the sequential numbers for the experiments.

For example: 99522 is the Experiment #2 in 1999 for temperate 2-way crosses (50% exotic).

IV. The table of the GEM yield trial data:

GEM yield trial data are presented here by years and experiments within years. Each experiment is named by numbers, which are explained above. If you need more information, feel free to contact the GEM webmaster.

GEM Yield Trial Data:

  2013 2012 2011 2010 2009 2008 2007
2006 2005 2004 2003 2002 2001 2000 1999


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We are grateful to our Cooperators for their support!

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Contact us | Home | USDA | ARS | NCRPIS | ISU | Corn Breeding | January 10, 2014