Experimental Sites

We are monitoring 30 crop-management replicated treatments at 9 locations that cover major soil landform regions and climatic conditions in Iowa. Three of the six sites have tile drainage installations. Blue circles are locations with tile drainage and red circles are locations without tile drainage.

2017 experimental site map

Management information by treatment is provided in the table below

Number

Crop

Site

 

Planting date

Cultivar maturity

Seeds/acre

N rate

(lbs N/acre)

Previous crop

1

Corn

Northwest

  May 17 101-day 32,000

150

Soybean

2

Corn

North Central   May 18 101-day 35,000

150

Soybean

3

Corn

Northeast

  May 17

101-day

33,500

150

Soybean

4

Corn

Central - Ames   May 8 111-day 33,000 150

Soybean

5

Corn

Central - Kelley   May 17 111-day 35,000

150

Soybean

6

Corn

Southwest   April 30 115-day 33,000 150

Soybean

7

Corn

South Central   April 25 115-day 33,500

150

Soybean

8

Corn

Southeast   May 11 111-day

35,000

170

Soybean

9 Soybean Northwest   May 17 MG 2.2 125,000 0 Corn

10

Soybean North Central   May 18 MG 2.2 140,000

0

Corn

11

Soybean

Northeast

  May 17 MG 2.2 200,000

0

Corn

12

Soybean Central - Ames   May 8 MG 3.2 125,000

0

Corn

13

Soybean Central - Kelley   May 17 MG 3.2 140,000

0

Corn

14

Soybean Southwest   April 30 MG 3.4 130,000

0

Corn

15

Soybean South Central   April 25 MG 3.4 149,000

0

Corn

16

Soybean Southeast   May 11 MG 3.2 141,000

0

Corn

Each system treatment is replicated three times. Within a plot we collect the measurements listed in the table below. Weather data are recorded hourly. Soil nitrogen data are taken twice per month at two depths from April to November. Soil water and temperature are monitored at multiple depths every 30 minutes. Crop data are collected eight times over the growing season. A portion of that data are provided in this website.

Weather Soil Crop
Temperature Water Staging
Radiation Groundwater Biomass production
Precipitation Temperature Biomass partitioning
Humidity Soil NO3 Leaf area index
Wind speed Soil NH4 Grain accumulation
  N20 emissions Tissue N concentration
  Tile drainage N-fixation
  NO3 leaching Root growth and depth
     

 

FACTS is an ongoing project developed to forecast and evaluate real-time soil-crop dynamics in specific ISU fields. Predictions and measurements will be frequently updated as new information becomes available during the growing season. The project investigators and Iowa State University are not responsible for extrapolations made by individuals to other fields. Information from this website can be used for presentations without further permission if used in its entirety and credit is given to the Iowa State University FACTS project. Information from this website cannot be used in publications or other model improvement activities without prior permission of the project investigators.