The dataset contains forage quality data from alfalfa variety tests conducted by researchers in the US from 1986 through 1999. All trials measured forage yield, while a subset also measured stand persistence; these data are also available in PURR. The data were aggregated from the Alfalfa Variety Performance Database originally compiled in 2000 by Daniel W. Wiersma and Wayne G. Hartman (doi: 10.4231/PHKH-4334). The database was used to analyze long-term trends in genetic improvement of alfalfa yield, quality, and agronomic performance.
The forage quality file contains cultivar- and harvest-specific forage quality and corresponding yield data. It is organized by Trial, and includes trial-specific spatial (state, latitude, longitude, elevation), and temporal (year of trial, harvest number, harvest date, planting date) details. Finally, when available soil type and statistics are also provided. A companion dataset contains the characteristics of these alfalfa varieties (doi: 10.4231/FMY9-6966).
Cite this work
Researchers should cite this work as follows:
- Wiersma, D., Wayne G. Hartman, Pejša, S., Brouder, S., Volenec, J. (2020). Genetic and environmental variation in alfalfa forage quality from variety testing experiments conducted in North America between 1986 and 1999. Purdue University Research Repository. doi:10.4231/02PR-9H36