Physical Sciences and Mathematics Commons^™

Hydrology And Sedimentology Of Dynamic Rill Networks Volume Ii: Hydrologic Model For Dynamic Rill Networks, Lindell E. Ormsbee, George E. Blandford, John S. Montgomery, Laura B. Terrell, Billy J. Barfield, Daniel E. Storm

KWRRI Research Reports

A comprehensive model has been developed for use in modeling the hydrologic response of rill network systems. The model, which is called HYMODRIN, is composed of both a hydrologic runoff component and a hydraulic channel routing component. The hydrologic component of the model uses a Green Ampt infiltration approach linked with a nonlinear reservoir runoff model. The channel routing component of the model is baaed on a finite element solution of the diffusion wave equations. In order to account for backwater effects the model employs a dual level iteration scheme.

The model may be used in either a stand alone …

Hydrology And Sedimentology Of Dynamic Rill Networks Volume I: Erosion Model For Dynamic Rill Networks, Daniel E. Storm, Billy J. Barfield, Lindell E. Ormsbee

KWRRI Research Reports

No abstract provided.

Modeling Mass Transport In Aquifers: The Distributed Source Problem, Sergio E. Serrano

KWRRI Research Reports

This report presents a new methodology to model the time and space evolution of groundwater variables in a system of aquifers when certain components of the model, such as the geohydrologic information, the boundary conditions, the magnitude and variability of the sources or physical parameters are uncertain and defined in stochastic terms. This facilitates a more realistic statistical representation of groundwater flow and groundwater pollution forecasting for either the saturated or the unsaturated zone. The method is based on applications of modern mathematics to the solution of the resulting stochastic transport equations. This procedure exhibits considerable advantages over the existing …

Kentucky Pride Hay Growers Association — After One Year, Mark Mattingly

Kentucky Alfalfa and Stored Forage Conference

High quality forages have been the "frontline" for successful horse and cattle operations for years. In Kentucky, we have grown, harvested and stored hay on the farm for as long as we have farmed. It is one of our principal forms of overwinter feed and has been grown primarily as an on-the-farm feed source.

Drying High Moisture Alfalfa Hay, Michael Collins, Blaine Frank Parker, George M. Turner

Kentucky Alfalfa and Stored Forage Conference

We all recognize the value of alfalfa in horse, dairy and beef rations. That's why we harvest over 17 million acres of this crop in the United States every year. Hay is a good way to harvest alfalfa because it stores well, provides long fiber in rations and we can market the surplus as a cash crop. Higher yields and higher quality mean more profit so we push to be sure we use the best management practices. All too often though, we lose part of all of a crop to rain damage. Some yield and quality is lost due to …

Hay Additive Review: "Where We've Been, Where We're Going", William C. Mahanna, Steve Soderlund

Kentucky Alfalfa and Stored Forage Conference

The losses from harvest to feed bunk are undoubtedly greater with hay than any other crop grown by the American farmer. The economic implications of reducing losses through improved harvest technologies is staggering when one considers the 75-85 million tons of alfalfa harvested out of the total 140-145 million tons of hay produced annually in the United States.

Alfalfa Producers: Do You Really Know How Good Your Alfalfa Is? Forage Analysis: Importance And Interpretation, Jimmy C. Henning

Kentucky Alfalfa and Stored Forage Conference

Forages make up over 75% of the diet of all cattle and are the basis of cow-calf industry in the midwest. However, a recent survey of over 1000 livestock producers in Missouri revealed that only 5.6 % had ever had their hay tested. They gave several reasons for why they had not tested hay (Table 1). By a large margin, the greatest reason for not testing was that they did not see a need. This fact highlights the purpose of this paper and presentation at the 10th Annual Kentucky Alfalfa Conference. This paper will explain the terms used in …

Alfalfa Cutting Management, Garry D. Lacefield

Kentucky Alfalfa and Stored Forage Conference

Alfalfa "Queen of the Forage Crops" is the most important forage legume grown in the united States. It is grown over a wide range of soil and climatic conditions. Alfalfa has the highest yield potential and the highest feeding values of all adapted perennial forage legumes. It is a versatile crop which can be used for pasture, hay, silage, green-chop, soil improvements and human consumption. As a result of this crops many merits; especially yield, quality and versatile use, it can be used successfully in many animal feeding programs.

Developing Alfalfa Varieties For The 21st Century, Jim Moutray

Kentucky Alfalfa and Stored Forage Conference

As we approach the end of the 20th century, alfalfa improvement is happening at a very rapid pace, New varieties are being released at the rate of more than 30 per year. During the past 30 years, the roles of public and private research have changed significantly. Emphasis in public efforts has changed from variety development to basic research accompanied by an overall reduction in funding. Private industry, which released less than 20% of the new varieties prior to 1960, has released over 95% of the varieties since 1981. Funding of private research has increased dramatically during this period.

Foreword [1990], Garry D. Lacefield

Kentucky Alfalfa and Stored Forage Conference

This is the front matter of the proceedings.

Urease Inhibitor Reduces Ammonia Loss From Surface-Applied Urea, Wilbur Frye, Lloyd W. Murdock, Robert L. Blevins

Soil Science News and Views

Urea is the world's leading N fertilizer, and its use continues to grow. In the USA, for example, the use of urea increased 50 fold from 1955 to 1986. During that same time, its use in Kentucky increased from 214 to more than 112,000 tons per year, which was 28% of the N used in Kentucky in 1986. The increasing popularity of urea is due to advantages over other N fertilizers in its manufacture and to its use in making most N solutions, another rapidly growing form of N fertilizer. Desirable qualities of urea include the highest N content of …

Effectiveness Of Two Lime Sources With Different Relative Neutralizing Values (Rnv), Greg Henson, Lloyd W. Murdock

Soil Science News and Views

Quality of agricultural lime (ground limestone) is an important factor in maintaining proper soil pH. The quality of lime is determined by its purity and fineness of grind. Purity is the amount of calcium and magnesium carbonate present in the limestone. Clay, silt, sand, organic matter, and other materials present in limestone rock dilute its purity. Since limestone is slowly soluble, it must be finely ground to be effective. The more finely ground the lime, the more rapidly it will dissolve in the soil.

Sulfur And Magnesium Trials With Wheat In West Kentucky, Monroe Rasnake

Soil Science News and Views

Interest in fertilizing wheat with sulfur and magnesium has increased recently in West Kentucky. This has been due primarily to positive test results in adjoining states and recommendations being made by some commercial people. Previous-testing in Kentucky has shown no response by wheat to sulfur, or to magnesium. However, in order to have current data on which to base recommendations, research plots were established in the fall of 1987 in Todd and Hopkins counties. They were repeated on different farms in 1988, making a total of 4 different sites studied.

Effectiveness Of Surface Application Of Phosphorus And Potassium On Yield Of No-Till Corn Grown On Soils Testing Low Or Medium Below A Depth Of 3 Inches, Grant W. Thomas

Soil Science News and Views

When crops are grown continuously under no-tillage or very minimum tillage, there is a tendency for phosphorus (P) and potassium (K) to become concentrated at or near the soil surface. This occurs when P and K fertilizers are broadcast on the surface and not mixed with the soil as would occur with plowing. The result is a stratification of P and K such that the surface few inches become very high in those nutrients, but soil test levels remain largely unaffected below that. The question is whether high yields of no-till crops can be obtained under these conditions.

Has The Nitrate-Nitrogen In Streams Draining Agricultural Watersheds In Kentucky Changed In The Last 18 Years?, Grant W. Thomas, Gerald R. Haszler, James D. Crutchfield

Soil Science News and Views

In 1971 and 1972, we sampled streams across Kentucky for nitrate-nitrogen (NO₃-N) during the high-water flow months of January through June. The results were variable and showed a dominant effect of geology and lesser effects of both time and land use on the results. Since that time, use of fertilizer nitrogen (N) has nearly doubled in Kentucky and, further, there is a high degree of concern among the public that NO₃-N from fertilizer use may be contaminating streams. The US Environmental Protection Agency has set a maximum of 10 ppm NO₃-N in water as …

The Effect Of Fall And Spring Tillage Of A Compacted Soil On Corn And Tobacco Yields, Kenneth L. Wells, Roy V. Catlett

Soil Science News and Views

Soil compaction is being diagnosed in increasing instances as the cause of poor crop performance in Kentucky. While the basic causes of compaction can usually be identified, it is much more difficult to prescribe techniques to solve the problem. Following identification of compacted soil as being the cause of poor corn growth in a field in Shelby County, Kentucky, a study was conducted to compare three tillage tools on production of corn and tobacco. The compacted zone was within the top 6-inch layer of soil.

Movement Of Triazine Herbicides In Conventional, Reduced Tillage, And No-Tillage Corn Production, William W. Witt, K. W. Sander

Soil Science News and Views

Herbicides are applied to over 90 percent of the corn acreage in Kentucky and triazine herbicides are used the most. Conservation tillage methods are often used to prevent soil erosion and to conserve soil water. However, as tillage is decreased the dependence on herbicides for weed control often increases. Minimizing herbicide movement from the application sites to non-target areas, such as ground and surface waters, is necessary to maintain optimum water quality.

Production Of No-Tillage Burley Tobacco, Jack M. Zeleznik, R. E. Phillips

Soil Science News and Views

In the early 1970's, researchers at the University of Kentucky produced burley tobacco by using no-tillage methods. These studies were abandoned a few years later due to poor growth, poor plant survival, and the lack of adequate weed control as the contributing factors. In 1984, the experimental production of no-tillage burley tobacco was reinitiated with the hopes that the newer herbicides would perform more effectively for no-tillage tobacco production. Burley producers could realize several potential advantages to no-tillage tobacco production if the yields produced by no-tillage were equal to or near those of conventional tillage. These potential advantages would include: …