By Konrad Mengel, Ernest A. Kirkby, Harald Kosegarten, Thomas Appel
This is the fifth version of a well-established ebook Principles ofPlant Nutrition which used to be first released in 1978. an analogous structure is maintained as in prior variants with the first goal of the authors to think about significant strategies in soils and crops which are of relevance to plant nutrition.This re-creation supplies an updated account of the clinical advances of the topic through making connection with approximately 2000 guides. a superb function of the publication, which distinguishes it from others, is its huge process encompassing not just easy foodstuff and body structure, but additionally sensible features of plant meals concerning fertilizer utilization and crop creation of direct value to human nutrients. spotting the overseas readership of the e-book, the authors, as in earlier variations, have tried to jot down in a transparent concise kind of English for the good thing about the numerous readers for whom English isn't really their mom tongue. The booklet could be of use to undergraduates and postgraduates in Agriculture, Horticulture, Forestry and Ecology in addition to these gaining knowledge of in Plant Nutrition.
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Example text
Hence soil water potential is influenced by soil matrix forces and by osmotic forces . In the old water terminology (pF scale) soil water is regarded as being pressed to soil surfaces which is not correct; the soil water is virtually sucked to soil surfaces a phenomenon which may be regarded as a negative pressure. Therefore water influenced by adsorption processes and not exposed to a hydrostatic pressure other than that of the atmospheric has a negative water potential. Water flow is always from the higher to a lower water potential since the potential difference is the driving force for water flow.
In this respect molecular adsorption differs basically from ion adsorption, which under soil conditions is largely independent of changes in temperature. 6 Colloidal systems All the processes described above, involve reactions between diffusible particles (ions, molecules) and surfaces. The significance of these surface reactions is greater the larger the exposed surface area. The ratio between the surface area and the bulk of a material depends on the degree of its dispersion. Smaller particles clearly expose a relatively larger surface area .
In an analogous way other 2: I clay minerals (illite, vermiculite) can adsorb K+ and NH/ rather specifically. This is considered in more detail on page 32 . The relative replacing power of one cation species by another one depends not only on the nature of the two cation species in question but also on their concentrations or more precisely on the activities of the ions present. For the sake of simplicity, ion concentrations are usually considered. It should be remembered, however, that ion activities rather than concentrations apply to exchange reactions and equilibrium conditions between free and adsorbed ions .