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An on-the-go optical soil sensor with 660nm red and 940nm near-infrared wavelengths with an electrical conductivity (EC) sensing unit were tested to estimate soil organic matter (SOM) and cation-exchange capacity (CEC) on 551ha on 15 fields in 6 U.S. states. For calibration between sensed data and lab-analyzed values, a multivariate linear regression (MLR) with leave-one-out cross validation was performed...
Soil salinization is of great concern in the irrigated arid and semi-arid western U.S. due to its threat to sustainable agricultural productivity and thus is closely monitored. The measurement of electrical conductivity in saturated paste extracts (ECe) is the standard to which other salinity estimation methods are referenced. Since this method is laborious, the preparation of saturated pastes subject...
Rice farmers in China need accurate maps of soil salinity to make rational decisions for management. Modern sensors such as the Geonics EM38 conductivity meter, which records the apparent electrical conductivity, ECa, allied to geostatistics to convert sparse punctual measurements into digital maps can provide them.We have explored the combination in reclaimed land in the Hangzhou Gulf of the Yangtze...
Salt affected soils are pervasive in semiarid and arid regions worldwide. Traditionally, soil salinity has been measured via electrical conductivity (EC). This study evaluated the feasibility of using three different methods for prediction of surface soil salinity, namely visible near infrared diffuse reflectance spectroscopy (VisNIR DRS), portable x-ray fluorescence (PXRF) spectrometry, and remote...
Subsurface-tile drainage is designed to remove gravitational water and soluble salts from the soil-root zone. However, soil swelling, as influenced by soil Na and electrical conductivity (EC), will reduce saturated hydraulic conductivity. The objective of the experiments reported in this paper was to determine the influence of Na and EC on the amount of water retained at field capacity (−33kPa) in...
After the war, the greater part of the disturbed areas within the Western front zone of World War I (WW I) was taken back into culture. Even 100years after date, it can be assumed that the soil within these areas still contains the traces of the war. To account for a thorough inventory of both the soil variability, the WW I relicts and the anthropogenic disturbances and to identify their interactions,...
Numerous processes, past and present, have given rise to lateral and vertical variation in the soil and to its individual properties such as its salinity and electrical conductivity. The resulting patterns of variation are complex and appear to comprise both random and deterministic components. The latter dominates vertically as trends in most soil profiles, and in the situation we describe it is...
Real-time monitoring of soil salinity based on field samples and laboratory analyses is a costly and time demanding procedure, so that sound methods that could reduce the burden by making use of cheaper data would be a step toward a more sustainable salinity hazards monitoring system on the long run. Typically, this involves replacing presumably error-free laboratory salinity measurements with indirect...
Inland salt meadows are particularly valuable ecosystems, because they support a variety of salt-adapted species (halophytes). They can be found throughout Europe; including the peatlands of the glacial lowlands in northeast Germany. These German ecosystems have been seriously damaged through drainage. To assess and ultimately limit the damages, temporal monitoring of soil salinity is essential, which...
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