About the dataset
The purpose of this website is to make available the measured and simulated data from 36 1-acre plots located on the Northeast Research and Demonstration Farm near Nashua, Iowa. The measured data were analyzed with the Root Zone Water Quality Model (RZWQM) Version 1.0.2000.830 and summarized in 8 papers in a special issue of Geoderma (Volume 140, No. 3, pages 217-322). The economic returns associated with each plot year were budgeted using the EconDocs software, since improved and released as DevTreks.
The official website of the Northeast Research and Demonstration Farm:
A graphical presentation of the measured data:
Graphical presentation of measured data
Climate data for the Northeast Farm is available online:
The official soil series information about the Clyde, Floyd, Kenyon, and Readlyn soils can be downloaded from:
An interactive Access database of the measured and simulated results:
Access Database or Excel Spreadsheet
A spreadsheet detailing all of the operations used on the research plots:
Spreadsheet of Operations
A graphical summary of the simulated vs measured results for corn and soybean yields, tileflow, N concentration, and N loading by plot, year, treatment, rotation, tillage and N application method:
Nashua Simulated vs Measured
A listing of the RZWQM input files for each plot in each year:
RZWQM input files
More information on the RZWQM model and its applications can be found here.
A spreadsheet detailing all of the costs and returns:
Spreadsheet of Economic Returns
The DevTreks software also has the data and can be found here.
A list of publications related to the research on these experimental plots at the Northeast Research and Demonstration Farm:
Bibliography of water quality papers based on the Nashua site