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| Spotlight.......By Howard Doss | September 1999 |
FIRE PREVENTIONSTILL NEEDED IN RURAL MICHIGAN
| With 208 barn and stable fires out of 259 Michigan agricultural structure fires in 1998, fires are a farm problem. The leading known cause of residential fires in Michigan was incendiary or suspicious, followed by cooking and heating. Avoiding Fire Injuries & Death -USA: FACT #2. Plan your escape. FACT #3. Stop, Drop and Roll if your clothing is on fire. FACT #4. Electrical fires can have warning signs before a fire erupts. FACT #5. Cooking-related fires rank first in home fires and home fire injuries. FACT #6. New residential construction should consider automatic sprinklers. FACT #7. Install smoke alarms outside bedrooms to warn people while there’s time to escape. FACT #8. Crawl low under smoke. FACT #9. Smoking materials continue to be the leading cause of fire deaths in the United States. FACT #10. Matches and lighters do light fires!
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ON THE ROAD TO PRECISION AGRICULTURE
Everything (including us) emits electromagnetic energy(assuming they are at temperatures above absolute zero). However, much of thisis at wavelengths outside the visible band. Sunlight is important in remotesensing. When sunlight interacts with the plant, three things can happen to thatenergy. It can be:
reflected (like our image in a mirror)
transmitted (like sunlight through a window)
absorbed (like a sun bather "soaking up the rays")
Much of the light energy that we sense using remote sensingtechnologies is a combination of sunlight energy reflected by the plant andenergy emitted by the plant. The dominant plant pigments involved are thechlorophylls. These compounds absorb energy in bluish (400-500 nm) and reddish(600-700 nm) wavelengths, supplying energy for the photosynthesis process.Reflected energy is the greenish (500-600 nm) wavelengths. Very little of theenergy in the visible wavelengths is transmitted through the plant tissue.
During stress or senescence, chlorophyll absorption declines,and the carotenes and xanthophylls (absorption band around 450 nm) predominate,giving the plant tissue a yellow reflectance. Anthocyanins absorb bluish andgreenish wavelengths, giving rise to reddish color plant tissue when chlorophylllevels are low (such as during the fall color season in our hardwood forests).
Near-infrared (NIR) energy (wavelengths above about 750 nm)is predominantly transmitted through plant material, but enough is reflected tobe useful in estimating the amount of biomass. As the number of leaf layersincrease, NIR reflectance also increases.
Remotely sensed images of a plant canopy can be analyzed forthese differences in absorption of visible light and reflection of NIR energy.Generally, controlled experiments producing various levels of plant stress areused to generate a spectral response curve. These curves define how theresponse of the plant changes under stress or senescence conditions. Suspectareas in a field can be identified and assigned geographic coordinates which areuseful for scouting specific areas in the field.
One processing technique that seeks to take advantage ofthese reflectance relationships in the visible and NIR is called the NormalizedDifference Vegetation Index (NDVI). The index is generally used to produce anestimate of biomass in the field.
NDVI = (NIR - Red) / (NIR + Red)
However, we need to remember that there are many factors thatcan affect the apparent light reflectance from plants, including:
the angle of the sun above the horizon
water in the air (water absorbs NIR wavelengths)
particulates in the air (particularly scattering bluish wavelengths)
shadowing from clouds
In short, with the exception of NIR reflectance we all havepersonal experience with differences in light reflection. Remote sensingtechnologies try to quantify what our eyes see, and give the differencesobserved a specific geographic reference.
Roger Brook –
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SURFING THE WEB
Potato Information
Professional Associations
European Association for Potato Research - http://www.agro.wau.nl/eapr
The Potato Association for America - http://extension-horticulture.tamu.edu/potato/variety/paa.htm
Potato Research Institutes
CIP, The International Potato Center - http://www.cipotato.org
Canada - http://res.agr.ca
Romania - http://www.potato.ro
Finland - http://www.mtt.fi/english
Hungary -http://www.georgikon.pate.hu/enlish/a_potato.htm
New Zealand - http://www.crop.cri.nz.
Potato Organizations
World Potato Congress, Inc - http://www.potatocongress.org
WPC Inc hosts the fourth World Potato Congress in Amsterdam inSeptember, 2000 - http://www.potato2000.com
The National Potato Council - http://www.npcspud.com
Potato organization by state -http://www.npcspud.com/state.htm
Canada - http://www.peipotato.orghttp://www.potatonet.com
Great Britain - http://www.potato.org.uk
The Netherlands - http://www.nivaa.nl
South Africa - http://www.potatoes.co.za
New Zealand -http://www.greenzone.co.nz/ html/vegfed/vf_home.asp
Newsletters and Magazines
World Potato Congress online newsletter - http://www.potatocongress.org/newsletters.htm
The International Potato Center in Lima quarterly electronicnewsletter - http://www.cipotato.org/pir/gilb/newsletter.htm.
Canadian newsletters online http://www.bridgecommunications.com
Potato Grower Magazine http://www.potatogrower.com
Potato Country - http://www.freshcut.com
Internet Applications
Late blight forecast system offered by Dacom Systems in theNetherlands - http://www.dacom.nl
Weekly "aphid alert service" provided online to potatogrowers in Minnesota - http://ipmworld.umn.edu/alert.htm
Weather-related products specific to potato production in the state ofWisconsin - http://bob.soils.wisc.edu/wimnext/
TiSDat (Timely Satellite Data for Agricultural Management) - http://bob.soils.wisc.edu/nasacan.html
Want More?
Extensive list of potato related web sites - http://www.,potatonews.com
Roger Brook
Adapted from the Agri-Surfer Newsletter, September 7,1999, available at http://www.agrisurfer.com . ( Neither I nor Michigan StateUniversity endorse these sites. The information contained in these sites is theresponsibility of the site creator. )
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ON THE RESEARCH FRONT
Multispectral Data for Soil Mapping: Possibilities and Limitations
E.M. Barnes and M.G. Baker
ASAE Technical Paper 99-1138
Soil maps derived from random or grid-based sampling schemesare often an important part of precision crop management. The sampling andanalysis of soil to derive such maps requires a large investment of both timeand money. Aerial photos have been used as a soil mapping aid for years.Research studies have shown that such an approach can be useful for definingmanagement units in precision farming, but these studies are often limited to asingle field, not an entire farming operaiton.
The paper was presented at the 1999 ASAE annual meeting inToronto. In this study, multispectral airborne (green, red, near-infrared andthermal) images and satellite (SPOT and Landsat TM) images were used to derivesoil maps for a 700 ha research and demonstration farm in Arizona. These imageswere compared to soil textural analysis results from samples in the top 30-cm ofthe soil profile at an approximate grid spacing of 120 m.
Using spectral classification procedures on a field by fieldbasis, it was possible to map areas of the soil textural class (ie. sandy clayloam vs. clay loam) with reasonable accuracy.
Classification procedures were also used with vegetationpresent over the same area later in the season. Area of low vegetative growthtended to coincide with area of higher sand content. The resulting vegetationclasses can be helpful in deciding if the soil classes impact crop developmentenough to warrant different management practices.
Roger Brook
paper available to
MSU Extension staff on request.NEW
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PUBLICATION SHOWS USEFULNESS OF GEOTEXTILE FABRICS
Livestock operations have high traffic areas that becomemuddy or rutted during wet weather. Mud can be a problem wherever there is heavyequipment traffic. Muddy conditions can limit equipment mobility, hinder accessto feed or manure and could also limit animal movement. Muddy conditions alsohave been shown to affect animal health and performance.
Livestock producers looking for solutions to problems withmud will find a new Agricultural Engineers Digest, Using All-WeatherGeotextile Lanes and Pads, AED-45, from Midwest Plan Service (MWPS) to be agood resource. AED-45 recommends surfaces constructed with geotextile fabrics asa way to combat mud and the adverse conditions it creates. The publicationprovides a good overview of how to develop all-weather surfaces designed withgeotextile fabric, which is a synthetically engineered spun or wovenpolypropylene material used below the surface of the soil to provide additionalstability to the soil and to distribute loads over a wide area.
AED-45 illustrates some typical designs and common layoutsfor geotextile applications. It contains photographs depicting the proper way toinstall geotextile fabrics along with the engineering details of how to developgeotextile lanes and pads. The publication also presents a comprehensive examplecomparing five options for the surface of a cow lane showing the annual cost ofinvestment .
The book sells for $4.00 and is available from NancyAitcheson, Plan Service Secretary, Agricultural Engineering Department, FarrallHall, MSU, East Lansing, 48824, 517-353-3297. A no-cost office copy is alsoavailable from Nancy.
Howard Person
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FIBER REINFORCED CONCRETE
Wire mesh or steel rebar has long been used in concrete toimprove tensile strength, stabilize adjacent slabs, and as a component of thegrounding system for the control of stray voltage in animal facilities. Inrecent years there has been growing interest in the use of polypropylene fibersto improve the crack resistance of concrete. Polypropylene fibers are typicallyadded to the concrete mix at a rate of about 1˝ lb.($6-$7) per cubic yard. While these fibers may be useful in some cases,polypropylene or similar fibers should be not viewed as a replacement for wiremesh or steel rebar.
Settling of poorly compacted fill and freezing and thawing ofthe sub-grade are a common cause of slab instability. Wire mesh is used tostabilize concrete by preventing cracks or joints from opening up or shiftingvertically. Slab stability is important where materials are flushed or scrapedand where pipes or heating cables are embedded. Fiber reinforcement has beenshown to be useful in preventing small shrinkage cracks but is unlikely toprovide the slab stability provided by wire mesh or steel rebar.
There are concrete applications around the farmstead wherewire mesh or steel rebar may not be needed. Aggregate interlock and constructionjoints often provide adequate slab stability for sidewalks, basements, drivewaysand some pavements on a stable sub-grade. Fiber reinforcement may enhanceconcrete in these situations where wire mesh adds material and labor cost withlittle improvement in performance.
Fiber reinforcement can be used alone or with conventionalreinforcement to enhance certain concrete properties, but it should not be usedalone where wire mesh or steel rebar is needed to stabilize a slab.
Tim Harrigan
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EQUIPOTENTIAL PLANE REQUIRED IN CONCRETE FLOORS
Equipotential planes are now required by the 1999 NationalElectric Code (Section 547-9) to be imbedded in the concrete floors of alllivestock confinement areas that have electrical service. They have beenrecommended for many years as a method of preventing stray voltage fromaffecting livestock. A metal grid is installed in the concrete floor and isconnected to the metal stalls and the equipment the livestock can touch. Thegrid is bonded back to the building grounding system. If the stalls and floorare connected together, a voltage cannot develop between them.
An equipotential plane is easy to install when constructing abuilding. Before pouring the concrete floor, reinforcement steel mesh can bewelded to stall dividers and to metal equipment. It may be easiest to braze acopper wire to the steel mesh. The wire must be size AWG No. 8 or larger wherethe wire comes out of the concrete; sleeve it with a short piece of plasticconduit to keep it from breaking off.
In the unlikely event that stray voltage gets to a level thecows can feel, a voltage gradient ramp will be needed at places where livestockenter orleave the equipotential plane on a daily basis. A common method to builda ramp is to drive ground rods into the earth at a 45 angle at each entrance(four rods are usually enough). A copper wire can be used to connect the groundrods to the equipotential plane. More installation information can be found inASAE Engineering Practice EP473, Equipotential Planes in Animal ConfinementAreas.
Robert Fick
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ACCIDENT CLIPS AND SAFETY TIPS:
Michigan Farm & Orchard Fatal Injuries 1999 To-Date
r24Year-old Crushed in Rollover, March 4, Montcalm
r20 Year-old Caught in Tractor-loader,3-5-?
r49 Year-old Caught under Upset Tractor,4-1, Muskegon
r62 Year-old, Tractor, Rollover, 4-22,Hillsdale
r03 Year-old, Fell, Under Wagon, 6-28,Montcalm
r48 Year-old, Found in Round Baler on6-30, Calhoun
Do you have additional reports or newspaper clippings? If youhave, please mail or fax the details.
Sending farm injury news clippings and reports to me willincrease the Michigan farm safety data accuracy. The information is also used toidentify high-risk work and warn others about current farm operation hazards.
The information is sometimes very personal as many MSUEagents and directors have worked with the victims and the surviving familymembers However, your news clippings, fax or email reports are needed to keepthe agricultural industry’s risk assessment current. Only paid employees arereported in Michigan governmental statistics. Family or owner/operator farmworkers are the majority of Michigan’s farm labor force. MSU Extension is theonly source for such statistics.
Howard Doss
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FIRE PREVENTION WEEK
OCT. 3-9, 1999.
Sources of information:
9 National Fire Protection Association at. . . . . also http://catalog.nfpa.org(wildfire information) www.firesprinkler.org(sprinkler info )
9 Fire Marshal Division of the MichiganState Police
Howard Doss
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ARE YOU PLANNING A
14- to 15-YEAR-OLD
TRACTOR-TRAINING SESSION?
Several calls by extension offices trying to find a youthtractor training class found their way to my office. I feel this training shouldbe considered a priority for MSUE offices so that farmers can employ 14- and15-year-old youth legally. Also, employment opportunities for young people inrural areas have expanded with this Federal Exemption Training Certificate.Training is unique in that only extension offices and teachers of agriculturecan offer it. Your thoughts on this priority?
Howard Doss
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AgriculturalEngineering Extension Faculty
William G. Bickert. LivestockFacilities and Environment.
Roger C. Brook. Handling, Storage and Drying of Agricultural Products;Computer Applications in Agriculture.
Howard J. Doss. Safety Leader for Michigan Cooperative Extension Service;Agricultural Safety Specialist.
Daniel E. Guyer. Post-Harvest Storage and Handling and Value-AddedProcesses for Fruit and Vegetables; Machine Vision and Pattern Recognition.
Timothy M. Harrigan. Forage and Field Crop Power and Machinery. Ag ExpoChairman.
Richard L. Ledebuhr. Fruit and Vegetable Mechanization. Chemicalapplication equipment.
Theodore L. Loudon. On-Site Wastewater Treatment; Agricultural WaterQuality Impacts; Irrigation; Drainage; Livestock Waste.
Howard L. Person. Livestock Facilities; Environmental Control; ManagementOf Manure and Organic Residues.
Robert D. von Bernuth. Irrigation and Water Management; Coordinator,Animal Waste Management Programs.
Nancy Aitcheson - PlanService Secretary, Co-Editor
William Bickert - Extension Agricultural Engineer, Co-Editor