Farming
Storm Watch over USA with Stream Flood Status
Submitted by landviser on Sat, 09/02/2017 - 22:38Below you should see interactive map with active hurricane tracking over USA (Atlantic and Pacific). Also Weather Radar with current precipitation, next several days flooding outlook areas. Different color square markers indicate major river flood status with links to USGS site showing up-to-date water level and projected flooding. Purple squares - major flooding on-going. To see legend and toggle layers click on >> in top left corner.
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Sign up for webinar "Application of Geophysical Methods to Agriculture: Methods Employed"
Submitted by landviser on Fri, 02/07/2014 - 19:17- Agriculture
- Farming
- Agrochemistry
- Precision Ag
- Soil Pollution
- Water Pollution
- Reclamation
- Environmental Science
- Geophysics
- Soil Science
- vertical electrical sounding
- LandMapper
- soil EC mapping
- ERM-01
- ERM-02
- GPR
- electrical profiling
- Geophysical equipment
- subsurface imaging
- four-electrode probe
- EC
- site assessment
- ER
- SP
- Geophysical
- iVES
- RES2DINV
- RES3DINV
- resistivity inversion
- freeware
- Ag Geophysics group
- EC
- mapping
- monitoring
- resistivity
- self-potential
Dr. Larisa Golovko (President of Landviser, LLC) will be presenting "Geophysical Methods of Electrical Resistivity and Self-Potential in Agriculture" in first of
Agricultural Geophysics Webinar Series: "Application of Geophysical Methods to Agriculture: Methods Employed"
A live webinar on the application of geophysics to agriculture will be offered on:
Tuesday, February 18, 2014, from 3pm - 4:30pm EST
(2:00 - 3:30 CST, 1:00 - 2:30 MST, 12:00 - 1:30 PST)
This first in a series of agricultural geophysics webinars will focus on the near-surface geophysical methods presently being used for agricultural purposes, which include resistivity, self-potential, electromagnetic induction, ground penetrating radar, dielectric sensors, VIS/NIR/MIR spectrometry, gamma ray spectrometry, mechanical soil compaction sensors, and ion selective potentiometry. Five presenters will provide a short overview of agricultural geophysical methods during the first 30 minutes of the webinar. The last hour of the webinar will be devoted to a panel discussion with the presenters, who will answer questions from the audience.
Location
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Evaluating cultivation level of sandy soils in European Russia with electro-geophysical methods
Submitted by landviser on Mon, 01/14/2013 - 23:30Update: Full PDF of the paper is now available!
Electrical resistivity of cultivated sandy soils of humid areas is a complex characteristic based on three fundamental properties of soil matrix, such as soil texture, total organic matter (carbon content) and cation exchange capacity (CEC). Relationship of electrical resistivity (ER) with those properties has been approximated with exponential equation ER=a*exp(-b*x), where x is any of the properties above. The correlation coefficients for ER as function of CEC, texture, or organic matter were between 0.82 and 0.91 for the soils of Klin-Dmitrov watershed near Moscow and Kirov, which suggests their applicability for other humid areas. We present a new approach to approximate exponential relationship ER=a*exp(b*x) with a linear “piece-wise” function based on the age of cultivation for each field.This approach was used to develop management zones based on ER to separate uniform areas of similar organic matter, CEC and clay content. Those basic properties are the foundation of soil fertility in humid areas. They influence biomass and bioactivity of soil microorganisms, thus the exponential relationship between ER and soil microorganisms was also observed. The approach based of electrical resistivity or conductivity was used to evaluate fertility and degree of cultivation of sandy soils in humid areas and for detail soil mapping and delineation of management zones in adaptive precision agriculture. The field and laboratory electrical geophysical methods are recommended for quick and accurate soil mapping and management in sustainable farming.
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*at SAGEEP 2013, March 17-21 in Denver, CO, Larisa Golovko, Ph.D. will also present "Basic Theory of Measuring Electrical Resistivity, Conductivity and Self-Potential in Soils and Plants" with LandMapper ERM-02 and other commercially available geophysical equipment at post-conference workshop "Agricultural Geophysics: Theory and Methods". |
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Cite this presentation as:
Anatoly Pozdnyakov, P.I. Eliseev, Larisa Golovko, Lev A. Pozdnyakov, Maria S. Dubrova, and E.P. Makarova. “Evaluating Cultivation Level of Sandy Soils in European Russia with Electro-geophysical Methods.” In New Views of the Earth. Denver, CO: Environmental and Engineering Geophysical Society, 2013. http://www.eegs.org/AnnualMeetingSAGEEP/SAGEEP2013/SessionsAbstracts.aspx |
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Low-cost GPS logger
Submitted by landviser on Thu, 10/18/2012 - 18:56I had tested a small gadget called GPS logger from Columbus Visiontac. Complete product name-description is:
Product name |
Product Features |
Where to buy |
Columbus V-990 GPS Data Logger (microSD Slot, Voice Recording, 66 ch. MTK) |
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Columbus V-900 Bluetooth GPS Data Logger (microSD , Voice Tag for POI, Driverless, Push to Log, 25 millions waypoints*, XP / Vista/ Linux / Mac OSX Compatible) |
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Locations
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Seven-step approach for complete near-surface resistivity survey of farmland with LandMapper
Submitted by landviser on Tue, 10/09/2012 - 20:40Despite numerous EC-mapping case studies conducted in many countries, only a few studies have demonstrated a complex approach to electrical geophysical site survey. In most studies only one technique of EC-mapping, either EM, GPR or four-electrode method was employed. This is understandable since most commercially available EC/ER measuring equipment operate in limited range of resistivities and depths (1-2 manufacturer-set depths are typical).
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Quick Estimation of Salinity in Field Soils and Irrigation Water with LandMapper ERM-02
Submitted by landviser on Wed, 08/08/2012 - 16:57Soil salinity is routinely evaluated in the labs from electrical conductivity of liquid soil saturation extract (ECe). The resulted total salinity is reported either directly in conductivity units (dS/m) or converted to TDS (total dissolved solids) concentration in ppm (parts per million) using formula: 1 dS/m = 1 mS/cm = 1 mmho/cm = 640 ppm = 640 mg/L= 0.64 g/L=0.064%
But now EC of soil and waters can be measured directly in the field using highly accurate method of four-electrode probe and Landmapper ERM-02 measuring device. Best of all, probes can be build to sense different soil layers down to 30 ft! Probes are simple and inexpensive to make from common materials available at any hardware store.
Evaluation of stone contents in soils with electrical geophysical methods to aid orchard planning
Submitted by landviser on Fri, 05/11/2012 - 19:08Establishments of orchards and vineyards are long-term and money-intensive, but highly pay-off projects. This study allowed developing procedure for incorporating geophysical survey data into recommendations of usage skeletal soils under orchards. Geophysical methods of electrical resistivity, such as VES and four-electrode profiling provided the information about spatial distributions of stones in skeletal soils. The resistivity of rocks or stones is much higher (about 104-1012 ohm m) than the resistivity of soil horizons with any texture. Therefore, high resistivity will indicate the presence of stones in soil profiles.
Study was conducted on skeletal soils (Paleoxerolls and Lithic Xerorthents) formed on carbonate-cemented marine deposit, limestone, or pebbles of alluvial origin in western part of Crimea Peninsula, Ukraine. The stone content varied from 2 to 90% of fragments coarse than 2 mm by volume and stony layers occurred in soil profiles at the depth as shallow as 12 cm.
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How-to use LandMapper and consumer-grade GPS data-logger to quickly map salinity on farm fields
Task on hand: estimate salinity level on fields planned for rice next year. Six fields with total area of 322 acres were selected by farmer.
Equipment on hand: two LandMappers with different size probes attached (measuring electrical conductivity (EC) down to ~ 8” and 18”), Columbus GPS data-logger, all-road vehicle or “Mule”. Three people: farmer driving a '”mule” and recording data on paper, one person measuring with Landmapper at 18” depth, other person measuring EC with LandMapper to 8” depth and recording POI or way points with GPS. Results: 30 points recorded in less than 1.5 hour (including about 45 min break to wait out the rain). EC in the field varied from 5 mS/m to 106 mS/m on surface; and from 19 mS/m to 400 mS/m in deeper layer.
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