This readme.txt file was generated on 20221130 by Yuan Chai Recommended citation for the data: Chai, Yuan; Chan-Kang, Connie; Pardey, Philip G.. (2022). GEMS Collection: State-level U.S. Wheat Area by Variety Data, 1919-2019. Retrieved from the Data Repository for the University of Minnesota, https://doi.org/10.13020/1n07-d836. ------------------- GENERAL INFORMATION ------------------- 1. Title of Dataset GEMS Collection: State-level U.S. Wheat Area by Variety Data, 1919-2019 (v1.0) 2. Author Information Principal Investigator Contact Information Name: Yuan Chai Institution: GEMS Informatics Center, University of Minnesota Address: 248 Ruttan Hall, 1994 Buford Avenue, St Paul, MN 55108 Email: chaix026@umn.edu ORCID: 0000-0002-5127-9107 Associate or Co-investigator Contact Information Name: Connie Chan-Kang Institution: GEMS Informatics Center, University of Minnesota Address: 248 Ruttan Hall, 1994 Buford Avenue, St Paul, MN 55108 Email: chan0576@umn.edu ORCID: Associate or Co-investigator Contact Information Name: Philip G. Pardey Institution: GEMS Informatics Center, University of Minnesota Address: 248 Ruttan Hall, 1994 Buford Avenue, St Paul, MN 55108 Email: ppardey@umn.edu ORCID: 0000-0002-8012-1341 3. Date published or finalized for release: Nov 30, 2022 4. Date of data collection (single date, range, approximate date): NA 5. Geographic location of data collection (where was data collected?): United States 6. Information about funding sources that supported the collection of the data: Minnesota Agricultural Experiment Station (MAES) MIN-14-171 7. Overview of the data (abstract): Data on planted area-by-variety for the U.S. wheat crop at the state-level for the period 1919-2019 -------------------------- SHARING/ACCESS INFORMATION -------------------------- 1. Licenses/restrictions placed on the data: Creative Commons, Non-commercial, personal uses only. Attribution-NonCommercial-NoDerivs 3.0 United States (https://creativecommons.org/licenses/by-nc-nd/3.0/us/) 2. Links to publications that cite or use the data: Chai, Y., Pardey, P.G., and Silverstein, K.A.T. 2022. Scientific selection: A century of increasing crop varietal diversity in US wheat. Proceedings of the National Academy of Sciences. Forthcoming. 3. Was data derived from another source? Yes If yes, list source(s): From 1919 to 1984, acreage-by-variety data are reported quinquennially for a total of 42 states by USDA’s Statistical Bulletins on the Distribution of the Varieties and Classes of Wheat in the United States. Thereafter we sourced the required data from state-specific agricultural statistical services. 4. Terms of Use: Data Repository for the U of Minnesota (DRUM) By using these files, users agree to the Terms of Use. https://conservancy.umn.edu/pages/drum/policies/#terms-of-use --------------------- DATA & FILE OVERVIEW --------------------- 1. File List A. Filename: GEMS_WVA_data_v1.0.csv Short description: US wheat area-by-variety data 2. Relationship between files: NA -------------------------- METHODOLOGICAL INFORMATION -------------------------- 1. Description of methods used for collection/generation of data: Citations to publicly available sources: California Wheat Commission. 2019. “2019 California Wheat Variety Survey.” Briggle, L.W., S.L. Strauss, D.E. Hamilton, and G.H. Howse. 1982. Distribution of the Varieties and Classes of Wheat in the United States in 1979. USDA. Minnesota Association of Wheat Growers ed. 2019. Prairie Grains. Red Lake Falls, MN: Minnesota Association of Wheat Growers. Nebraska Wheat Board. 2019. “Nebraska Wheat Varieties.” Reitz, L.P., and L.W. Briggle. 1960. Distribution of the Varieties and Classes of Wheat in the United States in 1959. USDA. Reitz, L.P., and L.W. Briggle. 1966. Distribution of the Varieties and Classes of Wheat in the United States in 1964. USDA. Reitz, L.P., and W.G. Hamlin. 1978. Distribution of the Varieties and Classes of Wheat in the United States in 1974. USDA. Reitz, L.P., K.L. Lebsock, and G.D. Hasenmyer. 1972. Distribution of the Varieties and Classes of Wheat in the United States in 1969. USDA. Salmon, S.C., and L.P. Reitz. 1957. Distribution of the Varieties and Classes of Wheat in the United States in 1954. USDA. Siegenthaler, V.L., J.E. Stepanich, and L.W. Briggle eds. 1986. Distribution of the Varieties and Classes of Wheat in the United States in 1984. USDA. USDA. 2019. “Colorado Winter Wheat Varieties.” USDA National Agricultural Statistics Service. USDA. 2019. “Kansas Wheat Varieties.” USDA National Agricultural Statistics Service. USDA. 2019. “Oklahoma Wheat Variety Report.” USDA National Agricultural Statistics Service. USDA. 2019. “Texas Wheat Variety Report.” USDA National Agricultural Statistics Service. USDA. 2016. “Wheat Varieties Grown in Montana.” USDA National Agricultural Statistics Service. Washington Grain Commissioin. 2019. “Washington Wheat Variety Survey.” 2. Methods for processing the data: Data from different state/year were compiled and different variety names were standardized 3. Instrument- or software-specific information needed to interpret the data: NA 4. Standards and calibration information, if appropriate: NA 5. Environmental/experimental conditions: NA 6. Describe any quality-assurance procedures performed on the data: NA 7. People involved with sample collection, processing, analysis and/or submission: NA ----------------------------------------- DATA-SPECIFIC INFORMATION FOR: GEMS_WVA_data_v1.0.csv ----------------------------------------- 1. Number of variables: 6 2. Number of cases/rows: 28391 3. Missing data codes: No missing data 4. Variable List A. Name: var_std Description: wheat variety names, standardized across state/year B. Name: year Description: year when variety planted C. Name: state_abb Description: state name abbreviations D. Name: state Description: state full name E. Name: class3 Description: wheat market classes (3 types: Winter, Spring, Durum) D. Name: area Description: planted area (in acres)