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![Page 1: SOIL AND WATER QUALITY MONITORING TECHINIQUES Ramesh Kanwar Professor and Chair, Agricultural & Biosystems Engineering Department Iowa State University,](https://reader036.fdocuments.us/reader036/viewer/2022062417/5517ae1355034645368b5e82/html5/thumbnails/1.jpg)
SOIL AND WATER QUALITY MONITORING TECHINIQUES
Ramesh KanwarProfessor and Chair, Agricultural & Biosystems Engineering Department
Iowa State University, Ames, Iowa USA
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Objectives of Soil and Water Monitoring
1. To determine the impact of any activity on the landscape (agriculture, chemicals, manure use, industry, human or industry waste etc) on surface or groundwater quality
2. To make sure our drinking water supplies are safe for human consumption.
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World Water Supply
97.2% Saline2.15% Icecaps& Glaciers
0.307% in GroundWater < 0.5mi deep
0.307% in GroundWater > 0.5mi deep
0.005% soilmoisture
0.01% in surfacewaters & theatmosphere
2.8% Fresh
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Water Quality Issues Related to Human Health
Main compounds are - N, P, pathogens, and antibiotics Surface and groundwater pollution potential High NO3-N levels can cause blue baby syndrome
(methemoglobinemia) High NO3-N can lead to etiology of stomach cancer (only
limited evidence available) Bacteria and pathogens can be disease causing Antibiotics as feed supplements are finding ways to water
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WATER QUALITY CONCERNS FROM ANIMAL WASTES
• Main concern is infant health– Nitrate/nitrite causes “blue baby” disease– Newborn babies essentially suffocate– Water Quality Standard for Nitrate-nitrogen is 10 mg/l
• SURFACE WATER WATER BODIES:– Ammonia > 2 mg/L Kills Fish– Phosphate > 0.05 mg/L promotes excess algae growth which
leads to Fish Kills - Eutophication– BOD depletes oxygen which causes Fish Kills - Hypoxia
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Agricultural Contribution: World Perspective
• 60% N and 25% P from European Ag to North Sea
• 48% of nutrient pollution in the former Czechoslovakia
• Significant levels flowing into the Adriatic Sea
• Eutrophication problems in Lake Erie
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NITROGEN LOSSES FROM FARMS IN THE MISSISSIPPI BASIN – US Example
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Water Quality Issue: HYPOXIA• The worst hypoxic conditions are in the
Baltic Sea and the Black Sea• Hypoxic conditions have been increasing
since the 1960’s• The Gulf of Mexico, outside the delta of
the Mississippi River is the worlds third largest hypoxic area
• 12400 sq. km. (4800 sq. mi)
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Major Water Quality Issue: WORLD HYPOXIC ZONES
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Current Status of Iowa LakesMean total nitrogen for Iowa lakes sampled three times during summer, 2000
(Downing and Ramstack 2001)
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To
tal N
itro
ge
n (
pp
m)
Proposed benchmark:
700 ppb Clear Lake
Crystal Lake
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Manure Characteristics and Production Estimates
( what does it contain)
6% of bodyweight per day
(most species)
13 - 15 % solids
85 -87% liquid
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Daily Manure Production Per Animal
• We have estimates of manure production– 4.5 kg/day/hd for swine (liquid manure)– 45-50 kg/day/hd for dairy cow (liquid)– 25-30 kg/day/hd for beef cow (liquid)
• Solid portion ~ 13-15% of total
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Animal Waste Nutrient Utilization Scenario
• Swine Confinement Facility
• 4000 animals @ 61 kg / animal
• Nutrient Content in kg/ day / 1000 kg
• 0.52 kg N / day / 1000 kg animal wt.
• 0.18 kg P / day / 1000 kg animal wt.
• 0.29 kg K / day / 1000 kg animal wt.
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Manure Characteristics
• In general…– Nitrogen (ammonia) is in urine– Phosphorus is in feces
• In the U.S. we’re working on ways to keep urine and feces separate
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Manure Management Issues
Animal manure is a liability in high density livestock production areas where fertilizers are cheap
Animal manure is an asset if fertilizers are unavailable or expensive
Odor and ammonia emission to air-global warming Odor issues are serious in residential areas Pollution of soil and water resources-water quality Hypoxia problems in international water
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Nitrogen
• Is mobile in some forms (NO3)
– not in others (organic, NH4)
• Does not carryover like P
• Is not determined by soil test
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Negative Environmental Impacts
•Nitrogen• - Nitrates leaching to tilelines and/or
groundwater
• - Ammonia runoff into surface water
• causing fish kills
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Negative Environmental Impacts
•Phosphorus• Loss with soil erosion
• Eutrophication (algae growth) of surface waters
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Phosphorus
• Is bound to the soil particles
• Remains in the soil year to year
• Moves if soil erodes
• Is determined by soil test
• Does not volatilize like nitrogen
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Manure Nutrient Planning
Determine the hectares needed to maximize nutrient use and minimize
negative environmental impacts
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Question 1
Which Nutrient should I use for planning...
Nitrogen?
Phosphorus?
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U.S. Manure Law says...
•Use nitrogen for nutrient planning• - Results in least land area needed• - May not be best use of nutrients because phosphorus is overapplied• - Laws in U.S. are changing to require P planning
•
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N:P Ratio of Manure
•N:P ratio is different for different types of manure
• N:P
•Cattle ratio… ~ 2:1
•Swine ratio… ~ 1.5:1
•Poultry ratio… ~ 1:2
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Phosphorus Planning
•Requires more hectares
•Results in lower application rates
•Maximize economic value of manure
•Depends on crop & manure application frequency
•Requires additional commercial N fertilizer
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Question 2
How much of the nutrient
should I apply??
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Plant Nutrient Utilization
•Plant utilization– Corn uses 0.7 lb/bu N 0.4 lb/bu P2O5
– Beans use 3.8 lb/bu N 0.8 lb/bu P2O5
•Plant fertilization – Corn needs 1.2 lb/bu N 0.4 lb/bu P2O
– Beans need 0.0 lb/bu N 0.8 lb/bu P2O
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Steps in Manure Nutrient Management
•1. Determine crop nutrient needs
•2. Determine manure nutrients available
•3. Calculate hectares needed for the manure
•4. Calculate manure volume to apply
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Summary - Manure Planning
•Not difficult to do
•Economically advantageous
•Manure can replace purchased fertilizer
•Using manure correctly is good for the environment
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Potential Pathways
• Phosphorus Surface water runoff
• Pathogens Surface water runoff• Organic Matter Surface
water runoff
Pollutant Pathway
1. Nitrate – N Leaching & Runoff
2. Ammonium – N Surface water runoff & Aerial deposition
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Soil and Water Quality Monitoring Techniques
• Soil sampling• Surface water sampling
• Surface runoff• Open ditch or irrigation canals• Small or large rivers• Ponds, lakes, reservoirs• Ocean, sea• Wetlands
• Groundwater• Shallow groundwater• Deep groundwater
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Soil Monitoring and Sampling
• Must know the objectives why to sample?• What to sample for?• When to sample?• Number of soil sampling?• Variability in sampling?• From various soil depths – Objectives?
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Soil Monitoring
• What to sample for?
• NO3-N, pesticides, organic matter, metals, organics, pathogens, micro-organisms, N, P, K, micro-nutrients.
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When to Sample?
• Once a week, month, or year.
• As a function of cropping system or season.
• As a function of weather cycle.
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Number of samples per field – function of cost?
• Spatial variability.
• Minimum three samples per plot.
• Several depths.
• Composite to cut down cost.
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Soil Sampling Techniques
• Soil augers
• Soil probes
• Back saver
• Zero contamination tube
• Hydraulic probes
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Problems During Soil Sampling and Transportation
• Cross-contamination
• Separation, collection
• Storage, transportation, temperature control
• Timely analyses in lab
• Laboratory techniques/interpretation
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Quantity Control/Quality Assurance
• Sending duplicate samples to recognized laboratories
• Manual on laboratory procedures
• All steps on how to collect soil samples and lab analyses.
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Water Quality Monitoring
• Point sources of pollution (manure storage platforms, spills)
• Non point sources (agriculture)
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Monitoring Needs
• Surface water
• Groundwater
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Surface water Monitoring• Field runoff
• Open ditches/drains
• Irrigation canals
• Ponds/Lakes/reservoirs
• Wetlands
• Streams, rivers (Danube River)
• Ocean, Sea (Black sea)
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Groundwater Monitoring
• At what depth would you like to collect water samples?
• Shallow depth < 3 m.
• Deep groundwater > 3 m.
• Monitor at depth increments 5, 10, 15, … 50 m??
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Groundwater Monitoring Techniques
• Piezometers
• Water table wells
• Deep ground water wells
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Construction of Groundwater Wells
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2. Glass bottles VS plastic bottles.3. Temperature control during
transportation.
4. Acidify samples if used for NO3-N analysis.
5. Store samples at 4oC until analyzed.6. EPA protocol is to analyze within 15 days
of collection.
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When to collect Groundwater Samples?
• Weekly, monthly, 3-4 time in a year??
• Define objectives• For drinking water wells – weekly/monthly
(weekly for public wells, monthly/six month for industrial wells)
• Quality VS quantity
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Vadose Zone Monitoring
• Water content and Chemical conc.
• Soil moisture potential – Tensiometers
• Soil water contents
• Soil salinity
• Temperature
• Soil pore water sampling
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Soil Pore Water Sampling
• Soil samples
Extract them for either NO3-N or pesticides
• Suction lysimeters• Caissiosn lysimeters• Trench lysimeters• Drainage systems• Piezometers• Single or multiple sampling wells