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3406 full-text articles. Page 49 of 57.

Alfalfa Hay For Horses: Myths Vs. Reality, Laurie Lawrence 2011 University of Kentucky

Alfalfa Hay For Horses: Myths Vs. Reality, Laurie Lawrence

Kentucky Alfalfa Conference

Does it really matter if hay has some mold in it?

Hay that is high in dust or mold can irritate the horse’s respiratory tract. Optimum athletic performance depends on a healthy respiratory tract, therefore dusty/moldy hay should never be fed to horses used (or intended for) athletic events. A chronic respiratory disease commonly called “heaves” can be aggravated by moldy and dusty hay. Horses with heaves can have so much difficulty breathing that even mild exercise is impossible. In addition, moldy hay may contain toxins that could affect the horse if they are ingested.

Horse owners should ...


Hay Drying, Preservatives, Conditioning, Ash Content, Dan Undersander 2011 University of Wisconsin

Hay Drying, Preservatives, Conditioning, Ash Content, Dan Undersander

Kentucky Alfalfa Conference

Drying forage for hay has always been a challenge. While we cannot control the weather we can manage cut forage to maximize drying. The purpose of this paper is to give a few principles of hay and silage making and discuss machinery available relative to these principles. Then we will also talk about minimizing ash in hay to optimize the total digestible nutrients of the forage.


Making Your Fertilizer Dollar Go Further, Greg Schwab 2011 University of Kentucky

Making Your Fertilizer Dollar Go Further, Greg Schwab

Kentucky Alfalfa Conference

Alfalfa is a high quality, valuable forage crop that can be successfully produced on most well drained soils in Kentucky, for hay and silage, and for grazing. Fertilizing alfalfa can be uniquely challenging because it is a perennial crop. In addition, high-yielding alfalfa removes a tremendous amount of soil nutrients when compared to other crops grown in Kentucky. A thorough understanding of alfalfa’s growth habits, nutrient requirements, and the soil nutrient supply mechanisms for alfalfa is necessary to effectively manage fertilizer inputs and maximize profitability while minimizing the environmental impact.


Keys To Getting A Good Stand Of Alfalfa, Garry D. Lacefield 2011 University of Kentucky

Keys To Getting A Good Stand Of Alfalfa, Garry D. Lacefield

Kentucky Alfalfa Conference

Profitable alfalfa production requires high yields of high quality forage, a long stand life and skillful marketing of the end product. This requires attention to details, timely action and advanced planning. There are four basic prerequisites for a successful alfalfa program: establishment, production, harvesting and marketing with a very specific goal within each component.


Alfalfa Varieties For Today And Tomorrow, S. Ray Smith 2011 University of Kentucky

Alfalfa Varieties For Today And Tomorrow, S. Ray Smith

Kentucky Alfalfa Conference

There are a number of new alfalfa varieties that have come on the market in the last few years. In fact, it can be hard keeping up with all the developments. In the following pages I will overview most of the important traits that can be found in new varieties. These include Roundup Ready®, potato leafhopper resistance, hybrids, lodging resistance, rapid regrowth, higher quality, resistance to new diseases, and more… Many times I am asked “Are new varieties really worth the cost?” The best way to answer that question is to consider work by Dr. Jimmy Henning where he summarized ...


Foreword And Recipients Of Kentucky Alfalfa Awards [2011], Garry D. Lacefield, Christi L. Forsythe 2011 University of Kentucky

Foreword And Recipients Of Kentucky Alfalfa Awards [2011], Garry D. Lacefield, Christi L. Forsythe

Kentucky Alfalfa Conference

No abstract provided.


Measuring Surface Chemical Properties Of Soil Using Flow Calorimetry, R. D. Rhue, Chip Appel, Nadine Kabengi 2011 University of Florida

Measuring Surface Chemical Properties Of Soil Using Flow Calorimetry, R. D. Rhue, Chip Appel, Nadine Kabengi

Chip Appel

Flow calorimetry, which is ideally suited for measuring reactions occurring at the liquid/solid interface, has been used to study the surface chemistry of many types of solids, but little use of it has been made in the study of surface reactions of soils. The purpose of this study was to demonstrate the application of flow calorimetry to the study of two fundamental soil chemical processes, namely cation exchange and phosphate sorption. Surface horizon samples of a Typic Acrorthox and a Typic Tropohumult from Puerto Rico, a strong acid cation exchange resin (Dowex 50W-8), and an amorphous Al(OH)3 ...


Selectivities Of Potassium-Calcium And Potassium-Lead Exchange In Two Tropical Soils, Chip Appel, Lena Ma, R. Rhue, William Reve 2011 California Polytechnic State University, San Luis Obispo

Selectivities Of Potassium-Calcium And Potassium-Lead Exchange In Two Tropical Soils, Chip Appel, Lena Ma, R. Rhue, William Reve

Chip Appel

Measurement of cation selectivity in soils provides important information about the affinity and binding strength of a particular cation on soil surfaces. Gaines-Thomas (KGT) selectivity coefficients were determined for a variety of K/Ca and K/Pb ratios on an Oxisol and Ultisol soil from Puerto Rico. The calculated KGT values indicated a preference for K+ over Ca2+ or Pb2+. The selectivity for Pb2+ was significantly greater than that for Ca2+ due to Pb2+'s larger hydrated charge density relative to that of Ca2+. The patterns of selectivity were independent of metal ...


Heats Of K/Ca And K/Pb Exchange In Two Tropical Soils As Measured By Flow Calorimetry, Chip Appel, Dean Rhue, Lena Ma, Bill Reve 2011 California Polytechnic State University, San Luis Obispo

Heats Of K/Ca And K/Pb Exchange In Two Tropical Soils As Measured By Flow Calorimetry, Chip Appel, Dean Rhue, Lena Ma, Bill Reve

Chip Appel

Flow calorimetry can provide useful information about surface chemical reactions in soils that cannot be obtained readily by other methods. When flow calorimetry is conducted over a range of surface coverages, different sorption heats can be calculated to yield information about how binding energies vary with coverage, i.e., surface heterogeneity. The purpose of this study was to determine heats of exchange for K/Ca and K/Pb systems using flow calorimetry and to evaluate the degree of surface heterogeneity with respect to cation exchange. Surface horizon samples from a Typic Acrorthox and Typic Tropohumult from Puerto Rico were used ...


Concentration, Ph, And Surface Charge Effects On Cadmium And Lead Sorption In Three Tropical Soils, Chip Appel, Lena Ma 2011 University of Florida

Concentration, Ph, And Surface Charge Effects On Cadmium And Lead Sorption In Three Tropical Soils, Chip Appel, Lena Ma

Chip Appel

Reactions of heavy metals with soil are important in determining metal fates in the environment. Sorption characteristics of two heavy metals, Cd and Pb, in three tropical soils (Mollisol, Oxisol, and Ultisol) from Puerto Rico were assessed at varying metal concentrations (0 to 1.2 mM) and pH values (approximately 2 to 7). All soils sorbed more Pb than Cd. Sorption maxima were obtained for each metal for the Oxisol and Ultisol soils, but not the Mollisol. Sorption appeared to depend more on soil mineralogy than organic matter content. Sorption isotherms were linear within the sorption envelope with similar slopes ...


Mechanisms Of Lead, Copper, And Zinc Retention By Phosphate Rock, Xinde Cao, Lena Q. Ma, Dean R. Rhue, Chip S. Appel 2011 University of Florida

Mechanisms Of Lead, Copper, And Zinc Retention By Phosphate Rock, Xinde Cao, Lena Q. Ma, Dean R. Rhue, Chip S. Appel

Chip Appel

The solid–liquid interface reaction between phosphate rock (PR) and metals (Pb, Cu, and Zn) was studied. Phosphate rock has the highest affinity for Pb, followed by Cu and Zn, with sorption capacities of 138, 114, and 83.2 mmol/kg PR, respectively. In the Pb–Cu–Zn ternary system, competitive metal sorption occurred with sorption capacity reduction of 15.2%, 48.3%, and 75.6% for Pb, Cu, and Zn, respectively compared to the mono-metal systems. A fractional factorial design showed the interfering effect in the order of Pb > Cu > Zn. Desorption of Cu and Zn was sensitive to ...


Point Of Zero Charge Determination In Soils And Minerals Via Traditional Methods And Detection Of Electroacoustic Mobility, Chip Appel, Lena Q. Ma, R. Dean Rhue, Elizabeth Kennelley 2011 California Polytechnic State University - San Luis Obispo

Point Of Zero Charge Determination In Soils And Minerals Via Traditional Methods And Detection Of Electroacoustic Mobility, Chip Appel, Lena Q. Ma, R. Dean Rhue, Elizabeth Kennelley

Chip Appel

Points of zero charge were determined on two highly weathered surface soils from Puerto Rico, an Oxisol and Ultisol, as well as mineral-standard kaolinite and synthetic goethite using three methods: (1) potentiometric titration measuring the adsorption of H+ and OH− on amphoteric surfaces in solutions of varying ionic strength (I) (point of zero salt effect), (2) direct assessment of surface charges via non-specific ion adsorption as a function of pH and I (point of zero net charge), and (3) electroacoustic mobility of reversible particles as it varies with pH and I (isoelectric point). The first two methods yielded points of ...


Sequential Sorption Of Lead And Cadmium In Three Tropical Soils, Chip Appel, Lena Q. Ma, Roy D. Rhue, William Reve 2011 California Polytechnic State University - San Luis Obispo

Sequential Sorption Of Lead And Cadmium In Three Tropical Soils, Chip Appel, Lena Q. Ma, Roy D. Rhue, William Reve

Chip Appel

It is important to examine mechanisms of Pb and Cd sorption in soils to understand their bioavailability. The ability of three tropical soils to retain Pb, Cd, and Ca was evaluated. The objectives of this study were to (1) determine the extent to which soil sorption sites are metal specific, (2) investigate the nature of reactions between metals and soil surfaces, and (3) identify how metals compete for sorption sites when they are introduced to soils sequentially or concurrently. Lead was shown to be much less exchangeable than Cd and inhibited Cd sorption. Cadmium had little effect on Pb sorption ...


Greener Pastures 5 - Managing Sulphur In Dairy Pastures, Mike Bolland, Ian Guthridge, Bill Russell, Martin Staines, John Lucey, Richard Morris 2011 Department of Agriculture and Food, Western Australia

Greener Pastures 5 - Managing Sulphur In Dairy Pastures, Mike Bolland, Ian Guthridge, Bill Russell, Martin Staines, John Lucey, Richard Morris

Bulletins

During 1999-2009, soil testing for sulfur (S) was undertaken on 48 paddocks at the Vasse Research Centre (VRC) at Busselton, in the south-west of Western Australia (WA).

Paddocks had been grazed intensively by dairy cows and their young stock over a period of 10 years, as part of the Vasse Milk Farmlets and Greener Pastures farming system projects. Pasture consisted of annual ryegrasses with some subterranean clover. Soils in the 48 paddocks were 1-2 m sand to sandy loam over massive clay, known locally as Abba sand. For many soils in the region, including Abba sands, the topography is flat ...


Greener Pastures 1 - The Greener Pasture Project: Managing Nutrients In Dairy Pastures, John Lucey, Mike Bolland, Don Bennett, Richard Morris, Bill Russell, Martin Staines 2011 Department of Agriculture and Food, Western Australia

Greener Pastures 1 - The Greener Pasture Project: Managing Nutrients In Dairy Pastures, John Lucey, Mike Bolland, Don Bennett, Richard Morris, Bill Russell, Martin Staines

Bulletins

As dairy farmers have strived to maintain profitability, many have farmed more intensively. More cows are milked and increasing inputs of fertiliser and purchased feed are used per hectare. However, these increased nutrient inputs have far exceeded the increase in nutrient output in milk production. The increasing nutrient surplus (inputs minus outputs) from intensification on dairy farms has met with increasing community concern about the environmental footprint of the dairy industry. In some other countries, dairy farmers who have intensified by increasing nitrogen inputs are now faced with legislation controlling the amount of fertiliser nitrogen that they can use.

The ...


Greener Pastures 2 - Nitrogen For Intensively Grazed Dairy Pastures, Martin Staines, Richard Morris, Tess Casson, Mike Bolland, Bill Russell, Ian Guthridge, John Lucey, Don Bennett 2011 Department of Agriculture and Food, Western Australia

Greener Pastures 2 - Nitrogen For Intensively Grazed Dairy Pastures, Martin Staines, Richard Morris, Tess Casson, Mike Bolland, Bill Russell, Ian Guthridge, John Lucey, Don Bennett

Bulletins

We undertook three main studies during the Greener Pastures project:

1. From mid 2005 to late 2008, a farming systems study was undertaken with five rates of nitrogen fertiliser as the main treatment. This study will be referred to as the ‘nitrogen response farmlets’.

2. From 2006 to 2008 a series of smaller ‘supporting’ studies were completed to investigate how grazing management influences the pasture production gains from nitrogen fertiliser. This will be referred to as the ‘nitrogen by growth-stage study’.

3. From early 2009 to early 2010, a farming systems study was undertaken to investigate the potential to increase ...


Greener Pastures 6 - Managing Soil Acidity In Dairy Pastures, Mike Bolland, Bill Russell, Martin Staines, Richard Morris, John Lucey, D L. Bennett 2011 Department of Agriculture and Food, Western Australia

Greener Pastures 6 - Managing Soil Acidity In Dairy Pastures, Mike Bolland, Bill Russell, Martin Staines, Richard Morris, John Lucey, D L. Bennett

Bulletins

During 1999-2009, soil testing for pH (in CaCl2) was used to determine lime application for 48 paddocks at the Vasse Research Centre at Busselton, in the south-west of Western Australia (WA).

Paddocks had been grazed intensively by dairy cows and their young stock over a period of 10 years, as part of the Vasse Milk Farmlets and Greener Pastures farming system projects. Pasture consisted of annual ryegrasses with some subterranean clover. Soils in the 48 paddocks were 1-2 m sand to sandy loam over massive clay, known locally as Abba sand.

For many soils in the region, including Abba sands ...


Greener Pastures 4 - Managing Potassium In Dairy Pastures, Mike Bolland, Ian Guthridge, Bill Russell, Martin Staines, John Lucey, Richard Morris 2011 Department of Agriculture and Food, Western Australia

Greener Pastures 4 - Managing Potassium In Dairy Pastures, Mike Bolland, Ian Guthridge, Bill Russell, Martin Staines, John Lucey, Richard Morris

Bulletins

We undertook three studies into the potassium requirements of high rainfall pastures: 1. Between 1999 and 2009, soil testing was conducted in 48 dairy paddocks at Vasse Research Centre (VRC) in the south-west of Western Australia (WA). This study will be referred to as the VRC soil test study.

2. Between 2002 and 2007, a potassium experiment was undertaken at Boyanup to improve our knowledge of potassium requirements of intensively grazed ryegrass pastures. This will be referred to as the Boyanup potassium experiment.

3. Between 2006 and 2010, potassium experiments were undertaken on two partner farms of the Greener Pastures ...


Greener Pastures 3 - Managing Phosphorus In Dairy Pastures, Mike Bolland, Ian Guthridge, Bill Russell, Martin Staines, John Lucey, Richard Morris 2011 Department of Agriculture and Food, Western Australia

Greener Pastures 3 - Managing Phosphorus In Dairy Pastures, Mike Bolland, Ian Guthridge, Bill Russell, Martin Staines, John Lucey, Richard Morris

Bulletins

Between 1999 and 2009, soil testing was conducted in 48 dairy paddocks at Vasse Research Centre (VRC) in the south-west of Western Australia (WA). This study will be referred to as the VRC soil test study.

Phosphorus experiments were undertaken on partner farms of the Greener Pastures project to improve our knowledge of the phosphorus requirements of intensively grazed ryegrass pastures. These are the partner farm phosphorus experiments.


Photo Highlights Of The 14th Heart Of America Grazing Conference, Heart of America Grazing Conference 2011 University of Kentucky

Photo Highlights Of The 14th Heart Of America Grazing Conference, Heart Of America Grazing Conference

Kentucky Grazing Conference

No abstract provided.


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