Download or read book A Chemical Study of Some of the Factors Affecting the Availability of Potassium in Soils written by William Kitchener Robertson and published by . This book was released on 1947 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Carbonic acid and carbonic acid combined with freezing and thawing, extract considerably less, and 0.5N hydrochloric acid only slightly more potassium from Greensboro pasture soil, than does extraction with\ ammonium acetate. The hydrochloric acid extraction indicates that this soil has a low supply of so-called moderately available potassium. Experiments with samples of fertilized Greensboro loam show little variation in the moderately available fraction." --

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 There was general agreement that the potassium recommendations currently in general use are oversimplified, outdated, and jeopardize soil, plant, and human health.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 Some Factors Controlling Potassium Availability in Texas Soils written by Billy Wayne Hipp and published by . This book was released on 1966 with total page 160 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 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 Factors Affecting the Availability of Potassium in Soils of the Lower Mississippi Deltas written by William E. Worsham and published by . This book was released on 1941 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of Some Aspects of the Chemistry of Soil Potassium in Some Soils of the UAR written by Ibrahim Hossain Abdo Elsokkary and published by . This book was released on 1965 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Factors Affecting the Movement of Potassium in Mineral Soils written by Clifford Newell Nolan and published by . This book was released on 1960 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Factors Influencing Availability of Potassium in Central Utah Soils written by John Bennett and published by . This book was released on 1956 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Behavior of Added and Native Potassium of Five Tennessee Soils and Factors Affecting Its Availability written by Jerry A. Burnette and published by . This book was released on 1966 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Miscellaneous Publication written by and published by . This book was released on 1930 with total page 1034 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Managing Soil Quality written by P. Schjønning and published by CABI. This book was released on 2004 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: In-depth treatments of the soil quality concept, its history, and its applicability in research and in developed and developing societiesAll 18 chapters are written by well-established experts from Europe, North America and AustraliaSoil quality is a concept that allows soil functions to be related to specific purposes. Managing soil quality takes a management oriented approach by identifying key issues in soil quality and management options to enhance the sustainability of modern agriculture. Topics covered include major plant nutrients (N, P, K), soil acidity, soil organic matter, soil biodiversity, soil compaction, erosion, pesticides and urban waste.

Download or read book A Study of Soil Potassium written by Bert E. Curry and published by . This book was released on 1912* with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Chemical Nature of Soil Potassium in Relation to Its Availability in Illinois Soils written by Roger Hammond Bray and published by . This book was released on 1940 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Some Studies on the Release of Potassium from Soils written by Coenraad Helmich Henri ter Kuile and published by . This book was released on 1952 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Factors Affecting the Release of Soil Potassium to Exchangeable Form on Drying written by Harry Mikio Kunishi and published by . This book was released on 1963 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: