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 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 Dissertation Abstracts written by and published by . This book was released on 1960-04 with total page 1112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abstracts from the American Potash Institute Library Services written by American Potash Institute, inc., Washington, D. C. Library and published by . This book was released on 1957 with total page 614 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:
Download or read book Soil Potassium Fractionation by Successive Extractions written by Abu Dardak and published by . This book was released on 1977 with total page 478 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 American Doctoral Dissertations written by and published by . This book was released on 1959 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Soil Acidity and Exchangeable Potassium on Alfalfa Yield written by Conrad C. Olsen and published by . This book was released on 1961 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abstracts written by American Potash Institute. Library and published by . This book was released on 1961 with total page 236 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 Effect of Subsoil Constraints on the Chemical Potential of Soil Potassium in a Catena in NSW Southern Tablelands written by Seija Tuomi and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil potassium (K) is of great agronomic importance to crop yield quality and quantity in Australia. A soil catena (toposequence) relates soil profiles at a functional scale, enabling interpretation of the landscape position effect on soil K, subsoil characteristics, soil horizon configurations and related patterns in soil chemical properties. The Fairview Farm soils have developed over a regionally extensive Siluro-Devonian felsic volcanic substrate. Linking soil parameters to hillslope processes at Fairview Farm likely mirrors processes operating at sites in a similar landscape setting and with similar agricultural land use. Naturally occurring K in soils comes from the weathering of rocks and the breakdown products of minerals in the long term (Sparks et.al, 1987), and in the short term it comes from the turnover of organic materials and further breakdown of soil particles. The nutrient capacity of K in the soil is determined by the total amount of exchangeable K present in the soil colloid and the energy at which it is delivered. This thermodynamic term is expressed as the relative activity ratio and exchange of K+ with Ca2+ and Mg2+. The K potential of a soil is a free energy measure of the amount of work plants need to do to acquire K from the soil and this is unique to each soil. Soil K potential in dryland agriculture can be measured by the isotherm technique. At Fairview Farm, situated between Binalong and Boorowa in New South Wales (NSW), the isotherms describe soil K behaviour on a catena with greater precision than measuring plant-available K. For this area, publicly available soil data mostly describe the upper 10 cm of analysed profiles, but typical crop rooting depth is much deeper (40-150cm). Agricultural soil testing is vital for farmers but has traditionally been expensive with a lag in data provision, meaning soil information is not readily available for 'just-in-time' monitoring. Use of the isotherm technique to evaluate K behaviour is a relatively inexpensive and timely approach that may address this issue and provide a level of detail otherwise not available. This research improves our understanding of K behaviour in an agricultural setting, using proximal sensing (Diffuse Reflectance Infrared Fourier Transformed (DRIFT) Vis-NIR spectroscopy) to measures secondary K-bearing clay minerals to illustrate the effect that secondary minerals have on soil K potential and Fe oxides to reflect on the soil structure. The K-bearing minerals are a source of K and they are associated with storage/release of K. Also, spectroscopy is used to map total K distribution in the soil. This new method is compared with the traditional method for mineral analysis, x-ray diffraction (XRF). Isotherms reveal that Fairview Farm soil preferentially adsorbs K from the soil solution, which is possible in heavy clay soils when K bearing secondary clay minerals are present. The exchange sites on K-bearing minerals must be filled before K accumulates in the soil solution, thus becoming plant available. All the landscape positions show preferential adsorption to some extent, but it decreases from the top of the hill to the bottom of the hill. Although this site has a small amount of plant-available K and only clusters of poorly crystalline K bearing secondary minerals, plants find it easy to extract K from the soil. The Crest plant available K is always at luxury levels, whereas the Mid-slope and Lower slope have decreasing amounts until the energy required to extract the plant available K becomes too much. i.e., K potential decreases too low. In this way, plant available K becomes a subsoil constraint, which is reflected in the uneven crop growth in the paddock.The soil overall is illite/kaolinite dominated, but geochemistry tells us that the formation of the secondary minerals is not dependent on the geology but rather it depends on what is in the soil solution. The top 80 cm of the soil has not evolved from the same geological origin as the soil below. Interstratification of illite with smectite makes it difficult to identify these two minerals as they are poorly crystallised. Farmers and their advisors should consider the mineralogy before deciding on how and when to apply K rich fertilizer.
Download or read book Chemical Mineralogical and Physical Properties of Seven Surface Soils from Panama with Special Reference to Cation Exchange Capacity and Potassium Status written by Jose Alberto Martini and published by . This book was released on 1966 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mineralogical Analyses of Some Soils from the North Central United States in Relation to Potassium Availability written by Murray H. Milford and published by . This book was released on 1962 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Potassium Supplying Power of New York Soils as Determined by Chemical Methods written by Burke Campbell Murphy and published by . This book was released on 1959 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Dissertation Index 1861 1972 Agriculture written by Xerox University Microfilms and published by . This book was released on 1973 with total page 1226 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 Nature. This book was released on 2020-12-14 with total page 466 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.
