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 Evaluation of Potassium Availability of Four Michigan Soils written by Kazuhiro Oya and published by . This book was released on 1970 with total page 458 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 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 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 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 Relationship Between Potassium Fixation and Some Chemical and Mineralogical Properties of Selected Mississippi Soils written by Nicholas Juma Wafula and published by . This book was released on 1986 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Potassium Supplying Power of Some New York Soils as Determined by Laboratory and Field Tests written by Coenraad Helmich Henri ter Kuile and published by . This book was released on 1950 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Relationship of Potassium Fixation with Certain Structural Properties of Clays in Selected Southern Soils of the United States written by Arifin and published by . This book was released on 1971 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Rates and Sources of Potassium on Yields and Mineral Content of Potatoes and Evaluation of Potassium Quantity intensity Relationships of Selected Michigan Soils written by Robert Jewell Crabtree and published by . This book was released on 1969 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Relationships Between Aluminum and Soil Acidity in Several Michigan Soils and Related Mineralogy Studies written by Paul Eugene Rieke and published by . This book was released on 1963 with total page 268 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 1965 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Quarterly Bulletin written by Michigan State University. Agricultural Experiment Station and published by . This book was released on 1960 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Potassium Fixation in Soils as Affected by Type of Clay Mineral Moisture Conditions and Concentration of Other Ions written by George Stanford and published by . This book was released on 1947 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Federal grant Research at the State Agricultural Experiment Stations written by and published by . This book was released on 1958 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This compilation is one of a series providing information on State agricultural experiment station research supported by Federal-grant funds appropriated annually by Congress under authorization of the Hatch Act of 1887, as amended and approved Aug. 11, 1955, and Section 204(b) of the Agricultural Marketing Act of 1946. It is prepared for use by research workers int he subject-matter areas presented. Only that part of each State's research program supported by Federal-grant moneys is included"--P. iv.
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 1975 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quarterly Bulletin Michigan State University Agricultural Experiment Station written by Michigan State University. Agricultural Experiment Station and published by . This book was released on 1960 with total page 888 pages. Available in PDF, EPUB and Kindle. Book excerpt:
