Set-up a drainage water quality simulation using RZWQM -Tutorial Part 2

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Feb 20, 2024

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1 Tutorial: Subsurface Drainage Water Quality Simulation Using RZWQM2 Part 2: Output (A case study) BREE 533 Soil and Water Quality Management Dr. Zhiming Qi. Bioresource Engineering Dpt. In this tutorial, we will walk you through a simulation on NO3 loss in a subsurface drainage field in Iowa, USA. You will learn: 1) How to read the output (yield, drainage, NO3-N loss); 2) Increase of N loss due to manure application; 3) Pesticide residual in soil and water; Session 1. How to read the output 1. Output can be extracted through “Project Summary” tool. Click the Project window, click “Project Summary” , select Iowa.ana, and choose Yearly Summaries. To get the crop yield , check Maximum, and “Biomass of Grain (kg/ha)”, “Generate Summary”. 2. Crop yield will be popped up: Raise your hand whenever you have question

2 3. Close the “Summary Information”. 4. To get the annual drainage flow, select “Tile Drainage (cm/day)”, check “Summation”, and click “Generate Summary”: The result will be:

3 5. Find out NO3 loss through tile drainage, and the result will be: Session 2. Increase of NO3 Loss due to Manure Application Add beef 3000 kg/ha manure to corn and 3000kg/ha swine manure to soybean. 6. Click “Management Practices ” in the tool bar for the scenario of Iowa, then click “Manure”, select Maize and Sobyean and input 3000 kg/ha manure as shown below: 7. Click “OK” and “Execute RZWQM ”. After the execution, get the NO3 loss following the steps shown in the picture below: Raise your hand whenever you have question

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4 8. The results are shown below:

5 Session 3. Pesticide in Soil and Water Glyphosate Lsopropylamine Salt (Roundup) is applied at a rate of 1.35 kg/ha each year. 9. To apply pesticide to corn and soybean field, click “Management Practices ”, then click “Pesticides” tab, input the pesticide information according to the following graph: 10. Check pesticide average daily content in soil profile and you will see the pesticide accumulation over years: 11. The results are:

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Set-up a drainage water quality simulation using RZWQM -Tutorial Part 2

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