University of Minnesota . Dept. Soil, Water, & Climate. Southwest Research and Outreach Center. Jeff . Strock, . Ph.D.. Soil Scientist. 12 October, . 2011. Ag. Water Summit – Drainage System Management. ID: 680019
DownloadNote - The PPT/PDF document "Drainage Water Management to meet Agrono..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Drainage Water Management to meet Agronomic and Environmental goals
University of Minnesota Dept. Soil, Water, & ClimateSouthwest Research and Outreach Center
Jeff Strock, Ph.D.Soil Scientist
12 October, 2011
Ag. Water Summit – Drainage System Management
There are no silver bullets when it comes to drainage water management practices to solve water quality impairments. Need to assess tradeoffs.Use silver buckshot!!!!!Appropriate drainage system designsControlled drainage
Ditch design / managementWater storage / WetlandsSide inlet controlsBioreactors / Bio CurtainsBuffers / WaterwaysCropping SystemsSlide3
Yield is a function of ____________?
Previous cropSoil organic matterClimate (temperature and precipitation)
Fertility (adequate P, K, Zn)
How much N does it take to produce 200 bu/A corn crop?Assumptions0.75 lb N removed with grain 0.55 lb N removed with stover0.35 lb N removed by rootsSlide5
The answer is -
~330 lb N/acre(200 x 0.75) + (200 x 0.55) + (200 x 0.35) = 330So where does it all come from?
Typical N application rate for Southern MN = 150 lb N/acre330 – 150 = 180 lb N/acreMineralization of soil organic matter and residue
Estimates: 1% SOM = 40 lb N (+/- 25-50%)So, 4.0% SOM = 160 lb N/acRainfall ~ 10 lb/ac/yr
Previous crop40 to 175 lb N/acreSlide6
How much water does it take to produce 200 bu/A corn crop?Slide7
The answer is -
~ 2,750 gallons/bushelor
~ 550,000 gallons/acreDuring a hot July, an acre of corn can use 7,000 – 8,000 gallons per day.
Depends on Frequency, Intensity ,Duration, AmountSlide8
10 parts per million Nitrate-N (ppm)In one
gallon of water, 10 ppm equals 1.3 thousandths of an ounce of N.
One foot of soil contains six inches of water
Six inches of water = 1.35 million lb per acre (1 acre-foot = 27,154 gal; 1 gal water = 8.34 lb)
So, it only
pounds of nitrate-N per acre to reach 10 parts per million nitrate-N
Every pound counts!
WHAT IS DRAINAGE WATER MANAGEMENT?Slide10
Drainage Water Management is the use of drainage practices that are designed to provide benefits of drainage while minimizing negative impacts on the environment.
Appropriate drainage system designsControlled drainageDitch design / managementWater storage / Wetlands
Side inlet controlsBioreactors / Bio Curtains
Buffers / WaterwaysCropping SystemsSlide11
APPROPRIATE DRAINAGE SYSTEM DESIGN
(depth, spacing, etc.)contributed by Dr. Gary Sands, UMNSlide12
Drainage System DesignSlide13
Upper Midwest Research
5-State CIG Project
Controlled Drainage in MN
Corn & Soybean Digest
Redwood Co. Research SiteHicks Family FarmSlide18
Illinois – CIGSlide19
Indiana – CIGSlide20
Iowa – CIGSlide21
Minnesota – CIGSlide22
Additional evaluation of practice under different soil types and climate conditionsQuantify GHG emissions under different management conditionsQuantify phosphorus lossesAdditional Education and Training for contractors, TSP’s, etc.Reduced drainage volume
Reduced nitrate loadReduced phosphorus loadNeutral to modest yield increaseSlide23
Today's Top Docs