Download or read book Bibliography of Literature on the Release and Fixation of Native and Fixed Nonexchangeable Potassium and Ammonium of Soils and Slicate Minerals written by United States. Bureau of Plant Industry, Soils, and Agricultural Engineering. Division of Soil Management and Irrigation Agriculture and published by . This book was released on 1952 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Literature of Agricultural Research written by Harald Ostvold and published by Univ of California Press. This book was released on with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Literature of Agricultural Research written by J. Richard Blanchard and published by Univ of California Press. This book was released on 2023-11-10 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: This title is part of UC Press's Voices Revived program, which commemorates University of California Press’s mission to seek out and cultivate the brightest minds and give them voice, reach, and impact. Drawing on a backlist dating to 1893, Voices Revived makes high-quality, peer-reviewed scholarship accessible once again using print-on-demand technology. This title was originally published in 1958.

Download or read book The Bibliographic Index written by and published by . This book was released on 1952 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Forest Fertilization Theory and Practice written by and published by . This book was released on 1968 with total page 332 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 The Library of Congress Author Catalog written by Library of Congress and published by . This book was released on 1953 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Release of Native and Fixed Nonexchangeable Potassium of Soils Containing Hydrous Mica written by R. F. Reitemeier and published by . This book was released on 1951 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliographic Index written by and published by . This book was released on 1956 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Release of Native and Fixed Nonexchangeable Potassium of Soils Containing Hydrous Mica written by United States. Department of Agriculture and published by . This book was released on 1951 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fixed Soil Potassium written by Kenneth Paul Dubrovin and published by . This book was released on 1956 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dictionary Catalog of the National Agricultural Library 1862 1965 written by National Agricultural Library (U.S.) and published by . This book was released on 1967 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Booklist written by Oregon State College. Library and published by . This book was released on 1954 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The National Union Catalog Pre 1956 Imprints written by and published by . This book was released on 1968 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determination of Fixed Potassium in Soils I written by Delbert Wayne Kolterman and published by . This book was released on 1952 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Subject Catalog written by Library of Congress and published by . This book was released on 1950 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Library of Congress Catalog written by Library of Congress and published by . This book was released on 1950 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: A cumulative list of works represented by Library of Congress printed cards.