Download or read book Release and Fixation of Potassium by Chemically Weathered Clays as Measured by Chemical Extraction and Plant Uptake Techniques written by Emery Swinford Conyers and published by . This book was released on 1963 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings written by Soil Science Society of America and published by . This book was released on 1968 with total page 984 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Abstracts of Masters Theses written by Ohio State University. Graduate School and published by . This book was released on with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings Soil Science Society of America written by Soil Science Society of America and published by . This book was released on 1969 with total page 1094 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Potassium Fixation and Release in Several Agricultural Soils of Georgia written by Marcus Michael Eichhorn and published by . This book was released on 1963 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Factors Affecting the Availability of Potassium Through Fixation and Release in Soils of Diverse Mineralogical Composition written by Gordon Lawrence Rees and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The management of soil potassium is complicated by sorption and release of K by soil minerals, with fixation of K by vermiculite removing it from the pool of readily-available exchangeable K. Several laboratory methods have been developed to characterize different pools of soil potassium, including ammonium acetate extraction of exchangeable K (XK), sodium tetraphenylboron extraction of exchangeable and some nonexchangeable K (TPB-K), and a method to estimate the potential of soils to fix K (Kfix). In order to understand the relationship of these methods to each other and to K uptake by plants, we undertook a series of experiments to evaluate the effect of K concentration, incubation time, soil moisture content, and mineralogy on soil K pools. Additions of K equal to initially measured Kfix values only partially reduced K fixation, and increased XK and TPB-K by less than the amount of K added, indicating that some K was fixed strongly enough to be removed from the nominally plant-available pool. Duration of incubation with K from 1 to 16 days did not significantly impact K fixation or availability as measured by these methods, indicating that fixation reactions took place within the first 24 hours. Incremental additions of potassium up to an amount equal to the cation exchange capacity resulted in increasing amounts of K fixed. For some soils, a plateau was reached indicating a maximum level of K fixation, but for other soils it is unclear if a maximum was achieved. Recovery of K by the TPB-K method was roughly twice as efficient as by the XK method. Approximately 50% of fixed K was plant-available nonexchangeable K (PANK), meaning it was recovered by the TPB-K method but not by the XK method. A single air-drying event, relative to soils maintained at field-moist water content, resulted in an increase in Kfix for all K-fixing soils by an average of 55 mg kg−1, but the change in Kfix for non-K-fixing soils was not consistent. The change in Kfix was not correlated with XK values. Changes in XK with drying were less than 20 mg kg−1 for most samples, with XK increasing for most K-fixing and low-XK soils, with less consistency for high-XK soils. Multiple cycles of wetting and drying did not result in further changes in soil K measurements. In a greenhouse pot study, K uptake by annual ryegrass (Lolium multiflorum) was best correlated with TPB-K (r=0.8966), and yield was best correlated with total K by aqua regia digestion (r=0.7465) followed by TPB-K (r=0.6692). The critical value for yield response determined by the TPB-K method was most successful in predicting significant responses to increased K rates. The XK method also performed well in this respect. K fixation by one soil resulted in reduced uptake of K, and in yield responses to higher K rates than predicted by critical values for all methods. For other soils, the effect of K fixation potential was unclear. Atomic force microscopy of clay grains from selected K-fixing soils and standard clays revealed complex surface morphology for most soils which made it impossible to delineate changes in layer spacing with K sorption or release. Nearly-flat surfaces and stacks of relatively few layers in smectite clays were more conducive to this analysis. For both montmorillonite and beidellite standards, layers collapsed with displacement of Na+ by K+, and re-expanded after extraction with a TPB solution. No zones of preferential K fixation or release were observed.

Download or read book Potassium Availability in Surface and Subsoil Horizons as Measured by Plant Uptake and Chemical Extraction written by Carol G. Wells and published by . This book was released on 1959 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chemical Processes in Soils written by M. A. Tabatabai and published by . This book was released on 2005 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Improving Potassium Recommendations for Agricultural Crops written by T. Scott Murrell and published by Springer. This book was released on 2022 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book highlights concepts discussed at two international conferences that brought together world-renowned scientists to advance the science of potassium (K) recommendations for crops. There was general agreement that the potassium recommendations currently in general use are oversimplified, outdated, and jeopardize soil, plant, and human health. Accordingly, this book puts forward a significantly expanded K cycle that more accurately depicts K inputs, losses and transformations in soils. This new cycle serves as both the conceptual basis for the scientific discussions in this book and a framework upon which to build future improvements. Previously used approaches are critically reviewed and assessed, not only for their relevance to future enhancements, but also for their use as metrics of sustainability. An initial effort is made to link K nutrition in crops and K nutrition in humans. The book offers an invaluable asset for graduate students, educators, industry scientists, data scientists, and advanced agronomists.

Download or read book Release of Potassium from Soils and Clays by Plant and Chemical Extractions and the Effect on Clay Mineral Structure written by Emery Swinford Conyers and published by . This book was released on 1966 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Agriculture written by and published by . This book was released on 1968-10 with total page 1682 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Potassium in Agriculture written by Robert D. Munson and published by . This book was released on 1985 with total page 1223 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Potassium Fixation and Release Characteristics of Clay Minerals and the Release of Potassium from Soils to Crops and to Chemical Extractants written by Graydon Edward Richards and published by . This book was released on 1961 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies Comparing the Potassium Chemistry and Clay Content of Some Michigan Indiana and Ohio Soils written by James Barrett Sallee and published by . This book was released on 1998 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Relationships of Potassium Fixation and Release to the Clay Mineral Composition of Some Michigan Soils written by Samuel Lewis Cummings and published by . This book was released on 1959 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chemical and Biological Methods for Determining Plant Available Potassium in Soils written by Emmett E. Schulte and published by . This book was released on 1961 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Soil Science written by Malcolm E. Sumner and published by CRC Press. This book was released on 1999-08-31 with total page 2240 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Handbook of Soil Science provides a resource rich in data that gives professional soil scientists, agronomists, engineers, ecologists, biologists, naturalists, and their students a handy reference about the discipline of soil science. This handbook serves professionals seeking specific, factual reference information. Each subsection includes a description of concepts and theories; definitions; approaches; methodologies and procedures; tabular data; figures; and extensive references.