Welcome to the Irris Scheduler Home Page
Irris Scheduler estimates irrigation water needs for corn, soybean,
established alfalfa, dry bean, potato and other crops, as well as
soil nitrogen losses and availability.
It was developed by the Purdue University Department of Agronomy
as an easy-to-use tool to assist crop producers with irrigation
scheduling and nitrogen application decisions.
New features in version 1.33 (as of 04-Apr-2016, release 18.104.22.168):
- Fix for importing muck soil AWC and pH.
- Fix for change in location of Weather Underground data sites.
(Important! Weather Underground sites now use the secure
You may need to install the OpenSLL libraries
if they're not already installed on your computer.
You can use the first Win32 installer here to do that:
New features in version 1.31 (as of 28-Jul-2015, release 22.214.171.124):
- Fix for inconsistency in how surface horizon organic matter override is used.
New features in version 1.30 (as of 20-May-2015, release 126.96.36.199):
- Support for exporting Irris input data to the AgMIP
Crop Experiment (ACE) file format (JSON).
- Fix for slight change in Weather Underground Personal Weather Station (PWS)
New features in version 1.22 (as of 13-Mar-2015, release 188.8.131.52):
- Improved speed of retrieving lists of weather stations.
- Adjustment to estimate of crop N uptake when moisture stress is present.
New features in version 1.21 (as of 25-Feb-2015, release 184.108.40.206):
- Support for retrieving weather data from Michigan Enviro-weather
- Fix for crop ET estimate.
New features in version 1.20 (as of 05-Feb-2015, release 220.127.116.11):
- In the list of weather stations to import weather data from, the distance
and direction from the field to each station is displayed if this can
be determined for the station's on-line weather source.
- In the list of weather stations, you can click a column header to sort
the list by that column (weather station name, ID, distance or direction).
- You can also select multiple weather stations to import from (for
example, the five nearest stations) and let the program interpolate
- When selecting weather station(s) to import from, you can click
the View Map button to see a map showing the locations of the field
and the selected station(s).
- Support added for weather stations in
Australia, Brazil, Canada, Mexico and Spain.
You can now select from a list of ASOS stations or Weather Underground
Personal Weather Stations in those countries. (Note: Click
the link at the bottom of this page to request support for your country's
ASOS and PWS weather stations.)
- You can now edit soil horizon data. This is particularly useful for
non-US locations where soil survey data isn't available to the program.
Refer to the program help for documentation on the soil properties
required by the soil nitrogen model and references for estimating
these properties yourself.
- In the Preview Schedule window, the new Chart button now allows you to
automatically chart soil moisture, weather, evapotranspiration and
soil nitrogen in Excel.
- The About box now has a Check for Updates button.
- Support for 7-21-7 fertilizer.
- Fix for EC adjustment to AWC.
New features in version 1.10 (as of 24-Sep-2014, release 18.104.22.168):
- Initial support for nitrogen from liquid swine manure.
- Support for drip tape irrigation.
- Support for 4-10-10 and 9-23-30 fertilizers.
- Support for Fallow previous crop.
- Support for soils with restriction layer in crop's normal root zone.
New features in version 1.09 (as of 27-Jan-2014, release 22.214.171.124):
- Updated to handle new format of weather station list (Import from Web).
New features in version 1.09 (as of 20-Jun-2013, release 126.96.36.199):
- This version can now estimate soil nitrogen losses and availability
for U.S. soils. The schedule now includes columns for daily nitrogen
availability and cumulative nitrogen losses.
- This version can also estimate crop nitrogen uptake for the
- You can now enter nitrogen fertilizer applications.
- If you want to account for irrigation water nitrates, you can enter
nitrate concentration (ppm) for one or more sample dates.
- You can now retrieve and import weather data from several weather
sources on the Web. If your weather station uploads data as a Weather
Underground Personal Weather Station, you can retrieve your own weather
- You can now enter changes in crop residue cover (for example,
- You can now start your schedule prior to crop emergence (for
example, you can start immediately after the previous crop's harvest
or prior to the next crop's first nitrogen fertilizer application).
- Additional example schedule files for both irrigation and nitrogen.
- Minor name change from "Irrigation Scheduler" to "Irris Scheduler".
- You can still open schedule data files created with previous versions.
New features in version 1.07 (as of 02-Feb-2012, release 188.8.131.52):
- Includes additional example files based on
USDA-NRCS SCAN data.
- Support for Rye grass hay.
- Support for retrieving
weather station data via the Internet (using fieldclimate.com Web service).
- Support for localization of date formatting to use "short date" format
from Windows Control Panel.
- Support for localization of number formatting to use the decimal symbol
from Windows Control Panel.
New features in version 1.06 (as of 22-Dec-2011, release 184.108.40.206):
- Support for indicating that the field is "coastal" instead of
"interior" (the default).
- Support for entering irrigation efficiency.
- New column in the weather grid for entering average daily relative
- More crops. Carrot, Onion (dry), Sugarbeet and Sunflower have been
- Irrigation schedule now includes rows of averages, maximums and
- Irrigation schedule can now be exported to a CSV file that can be
opened in Excel and other programs.
- Support for metric units as well as U.S. units.
- Help now includes notes for international users.
New features in version 1.05 (as of 21-Nov-2011, release 220.127.116.11):
- Updated for new National Weather Service forecast site.
New features in version 1.04 (as of 17-Feb-2011, release 18.104.22.168):
- New calculation model, based on "FAO Irrigation and Drainage Paper
No. 56: Crop Evapotranspiration".
- More locations. You can now select any of the 48 U.S. contiguous
- Once you've selected the state you can now access soil survey
data via the Internet. Click the Import Soil button to get started.
- More crops. Supports corn for grain, corn for silage, soybean,
dry bean, green bean, winter wheat, established alfalfa, sweet corn,
potato, melon and tomato.
- Support for latitude and longitude. Latitude is required for the
new calculation model, but it can also be used along with longitude to
zoom in on the irrigated field on a map using the new View Map
- Support for entering elevation (optional).
- New columns in the weather grid for entering average wind speed
(optional) and daily notes.
- Support for importing more weather data file formats. You can
also create your own weather data file with Excel and import it.
- Support for retrieving National Weather Service 5-day high-low
temperature forecast via the Internet.
- You can override the irrigated crop's growth stage to account for
a shorter or longer growing season.
- You can still open irrigation schedule files created with previous
versions of Irrigation Scheduler.
Click here to send e-mail if you have problems downloading or installing the software
Last updated: April 6, 2016
Copyright © 2016 Purdue Research Foundation