By Professor Dr. Eshel Bresler, Professor Dr. Brian L. McNeal, Dr. David L. Carter (auth.)
ISBN-10: 364268324X
ISBN-13: 9783642683244
ISBN-10: 3642683266
ISBN-13: 9783642683268
In holding with the spirit of a sophisticated sequence within the Agricultural Sciences, we have now tried to handle herein many of the present examine components getting used to represent, describe and deal with salt-affected soils. due to a specific amount of private bias inherent in our person viewpoints and backgrounds, a few components were accorded extra emphasis than others. it's been our target, besides the fact that, to supply both element approximately, or at the very least a contemporary connection with, every one significant quarter of present soil salinity study. this knowledge, coupled with what we are hoping to be a slightly logical development from descriptive fabric on equilibrium or near-equilibrium soil chemistry, via delivery procedures, to eventual administration practices together with a few basic fiscal judgements, should still permit the reader to bridge the distance from introductory soil chemistry or soil physics texts to the elemental literature of this quarter. The textual content could be perceived by means of the astute reader as a little bit asymmetric in its remedy of respective sections. We think that this can be to a definite quantity applicable, for it therefore portrays the unevenness of growth so far within the corresponding parts of study. The administration of saline and sodic soils continues to be mostly an empirical semi-science or perhaps paintings, while shipping phenomena are mostly handled in a way more theoretical (and additionally a way more hugely mathematical) vein. Equilibrium soil chemistry has traditionally occupied an intermediate place with recognize to its mixture of empiricism and theoretical rigor.
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Extra resources for Saline and Sodic Soils: Principles-Dynamics-Modeling
Example text
In addition, a soil cation exchange capacity (CEC) determination is required. Because of the considerable experimental pitfalls involved in an accurate exchangeable sodium determination, deviations between measured ESP values and ESP values as predicted from the SAR/ESP relationship generally are resolved in favor of the SAR-derived estimates. Anion repulsion (negative adsorption) has negligible impact on the SAR, where we are concerned only with an ion ratio, but can easily increase apparent quantities of soluble sodium by 5% or more.
For a given hydrostatic or osmotic pressure, the volume of water retained by the clay mass (proportional to the distance between the platelets) increases as the equilibrium solution becomes more dilute or as the value of R increases. Changes in the VCo Water Retention and Swelling 45 Fig. 25. ), for six cationic ratios (R= Na+ lCa2+) total (including structural) porosity then result from changes in the volume occupied by the textural porosity. For a given pore suction, the space between clay platelets increases as the value of R increases or as the equilibrium solution concentration (C) decreases.
22. OlO Nand 0Saline and Sodic Soils: Principles-Dynamics-Modeling by Professor Dr. Eshel Bresler, Professor Dr. Brian L. McNeal, Dr. David L. Carter (auth.)
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