This presentation by Babak Jafarisamani, a master's student at the University of Nebraska-Lincoln, was presented at the Daugherty Water for Food Global Institute’s Research Forum on Thursday, May 11, 2017. Babak is a 2016-2017 student support grantee of the Institute.

1. Report of three projects:
1, Field sensor density for crop management
2, CornSoyWater app for irrigation
3, N leaching calculator
Babak Jafarisamani,
Dept of Computer Science & Engineering
Haishun Yang,
Associate Professor, Dept of Agronomy & Horticulture
May 11, 2017

2. Objectives
1. Determine density of soil water sensors in field for
supporting online irrigation app
2. Develop CornSoyWater, a real-time online irrigation
app for corn and soybean
3. Develop N leaching calculator to improve N
management and reduce N losses.
1

3. 1. Improve irrigation management
2. Increase crop water use efficiency
3. Increase and stabilize crop production and
producers profit
4. Reduce nitrogen losses and improve
environmental quality
2
Importance for WFI missions

4. Soil sensor density study
• Identify fields and install sensors
• Collect and analyze data
• Set up a database for simulation
3

5. • Designed to be used by farmers
• Predict how much water is currently in the soil
• Determine if crop needs irrigation
• Predict how many days before next irrigation
4
CornSoyWater: online, real-time app for irrigation

6. 5
• Logging in and making new field
CornSoyWater: online, real-time app for irrigation

7. • Making new field, created fields
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No need for irrigation
Need for irrigation
CornSoyWater: online, real-time app for irrigation

8. 7
Rainfall Irrigation
Available soil water
Threshold for irrigation
• Soil water and crop condition assessment
today
CornSoyWater: online, real-time app for irrigation

9. 8
• Irrigation is called if water stress is likely to occur
Water stress
CornSoyWater: online, real-time app for irrigation

10. Nitrogen leaching calculator: online, real-time
prediction of N leaching losses
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SSURGO soil database
HPRCC weather networkCropland Data (USDA)
Maize-N model
engine
Nitrogen Leaching Web app
Google Map/Leaflet API

11. Nitrogen leaching visualization as colored polygons
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12. Heat map style visualization of nitrogen leaching
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13. User ability to draw filed map with any shape
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14. Results and impacts
• CornSoyWater has more than 1000 registered users. It
covers the High Plains region.
• CornSoyWater transforms empirical irrigation
management to model-based, high-tech digital
management with prediction. It saves time, labor and
water, and reduces environmental footprint.
• N leaching calculator helps reduce N leaching losses,
improve crop N use efficiency, and increase crop
production.
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15. 14
Thank You
Questions?