Earth Sciences Commons^™

Mgrre_Thinsections_Mgrre-23_7, Mgrre

Thin Sections

No abstract provided.

Mgrre_Thinsections_Mgrre-23_11, Mgrre

Thin Sections

No abstract provided.

Mgrre_Thinsections_Mgrre-23_15, Mgrre

Thin Sections

No abstract provided.

Mgrre_Thinsections_Mgrre-23_4, Mgrre

Thin Sections

No abstract provided.

Mgrre_Thinsections_Mgrre-23_21, Mgrre

Thin Sections

No abstract provided.

Mgrre_Thinsections_Mgrre-23_5, Mgrre

Thin Sections

No abstract provided.

Mgrre_Thinsections_Mgrre-23_1, Mgrre

Thin Sections

No abstract provided.

Mgrre_Thinsections_Mgrre-23_24, Mgrre

Thin Sections

No abstract provided.

Grassland Landscape Design: Working With Land-Managers, C. J. Pearson, R. K. Mann, I. G. Mann

IGC Proceedings (1977-2023)

We are entering an era of landscape design in order to simultaneously tackle largescale issues such as salinity and rising water tables, whole-farm profitability and the maintenance or enhancement of rural communities. In Australia, an important element of landscape design will be the reintroduction or broadening of the base of perennial grasses within farm systems. The goal of this project was to accelerate awareness and adoption of perennial grasses in a large but ecologically-specific area, namely the already-cleared steep uplands in the high rainfall recharge areas of the Murray-Darling Basin. We used a participatory model, in which land-managers made monthly …

Results With Methods For Measuring Herbage Mass In Situ, G. Nagy, I. Vinczeffy, K. Petõ

IGC Proceedings (1977-2023)

Two indirect methods for estimating herbage mass in situ were investigated in a research programme. Electric capacitance and spectral reflectance measurements were made and estimated values were compared with cut herbage mass results. Vegetation indexes (VI) measured by spectroradiometer showed a high correlation with fresh herbage mass, but there was no correlation observed between VI and dry matter results. Equations installed in electric capacitance meter were not feasible for Hungarian conditions. The change of electric capacitance in the sward (CMR) gave no correlation with cut DM yields. The investigated indirect methods are not suitable for research or production use yet.

Application Of Municipal Biosolids To Bahiagrass Pasture: Trace Metals In Harvested Forage, R. M. Muchovej, J. E. Rechcigl

IGC Proceedings (1977-2023)

Municipal biosolids (sewage sludge) are the by-products of wastewater treatment plants and their production, worldwide, has steadily increased over the past years. Florida is one of the fastest growing states in the USA. Biosolids are readily and increasingly available throughout the state. Pasture fertilization has been shown to increase biomass and quality of bahiagrass (Paspalum notatum Flugge) dramatically in Florida sandy soils. Nevertheless, with low cattle prices, ranchers are forced to reduce fertilizers inputs. Biosolids contain considerable amounts of nutrients, especially nitrogen (N), phosphorus (P), sulphur (S), calcium (Ca), and micronutrients, and are inexpensive when compared with commercial fertilizers. …

Rangelands Vegetation Mapping At Species Composition Level Using The Spicla Method: SDm Based PiXel ClaSsification And Fuzzy Accuracy. A New Approach Of Map Making, A. G. Toxopeus, C. A. J. M. De Bie, E. H. Kloosterman, J. K. Mbaluka, P. K. Mwangi, L. G. J. Boerboom

IGC Proceedings (1977-2023)

Vegetation maps have been made since centuries. The vegetation cover was represented as homogeneous mapping units (polygons), representing different vegetation types, where each type consists a combination of different plant species (floristic composition). More recent, with the use of satellite imagery, the polygons have been replaced by pixels with similar content as the polygon maps. In both approaches, field-observations were linked to the mapping units (polygons or pixels) often resulting in a complex of different vegetation types per mapping unit. In our new approach field data (sample points) on presence and abundance of individual grass species are spatially extrapolated based …

Adoption And Influence: Industry Evaluation Of The GrassgroTm Decision Support Tool, E. M. Salmon, A. D. Moore

IGC Proceedings (1977-2023)

The GrassGro Decision Support tool (DS tool) (Donnelly and Moore, 1999) was released for commercial use in Australia with a training package in late 1997. An assessment of its adoption was made by a survey of 53 registered users in March 1999. An evaluation of the software and training package was made at training workshops by 92 users between 1997 and December 1999. The response rates to the survey and the evaluation were 62% and 82% respectively. Seventy six percent of survey respondents had analysed at least one problem with GrassGro and 27% had applied GrassGro to five or more …

Digestibility Estimates Based On A Grass Growth Model Are Distributed Via Internet To Finnish Farmers, Marketta Rinne, J. Nousiainen, I. Mattila, H. Nikander, P. Huhtanen

IGC Proceedings (1977-2023)

Optimising the harvesting time of grass in primary growth is difficult under Finnish climatic conditions, because the digestibility of grass decreases on average by 0.5 percentage units daily. We constructed a model based on cumulative temperature and geographical location which estimates the digestibility of grass. This model is used to produce estimates utilising real time weather information. The estimates are presented as a map, which is revised daily. Farmers have free access to the maps via Internet.

Reducing Tillage Affects Long-Term Yields But Not Grain Quality Of Maize, Soybeans, Oats, And Wheat Produced In Three Contrasting Farming Systems, Kirsten Ann Pearsons, Emmanuel Chiwo Omondi, Brad J. Heins, Gladis Zinati, Andrew Smith, Yichao Rui

Agricultural and Environmental Sciences Faculty Research

Reducing tillage has been widely promoted to reduce soil erosion, maintain soil health, and sustain long-term food production. The effects of reducing tillage on crop nutritional quality in organic and conventional systems, however, has not been widely explored. One possible driver of crop nutritional quality might be the changing soil nitrogen (N) availability associated with reduced tillage in various management systems. To test how reducing tillage affects crop nutritional quality under contrasting conventional and organic farming systems with varied N inputs, we measured nutritional quality (protein, fat, starch, ash, net energy, total digestible nutrients, and concentrations of Ca, K, Mg, …

Kentucky Alfalfa Conference: A Team Approach To Alfalfa Education And Technology Transfer, Garry D. Lacefield, Monroe Rasnake, Christi L. Forsythe, Jimmy C. Henning, Bill Talley

IGC Proceedings (1977-2023)

Alfalfa has played an important role in providing farmers of Kentucky with a high yielding, high quality, persistent forage legume for many years. In 1980, a group of individuals under the leadership of University of Kentucky Forage Extension Specialists organized and implemented the first statewide educational event on alfalfa. This initial meeting gave rise to the Kentucky Alfalfa Conference that celebrated it’s twentieth anniversary in February 2000. This annual event has been co-sponsored by the University of Kentucky, Kentucky Forage and Grassland Council, along with other state and national groups including Certified Alfalfa Seed Council, Kentucky Department of Agriculture, Kentucky …

Developing A National Alfalfa Information System, David B. Hannaway, K. J. Hannaway, P. Sohn, S. Griffith, B. E. Avery, E. Nowick, W. F. Wedin, L. R. Vough, S. C. Bosworth, Garry D. Lacefield, Gary E. Bates, D. Undersander, N. P. Martin, J. Caddel, G. L. Kilgore, S. B. Orloff, A. M. Gray, R. Ditterline, T. Griggs, D. H. Putnam, M. J. Ottman

IGC Proceedings (1977-2023)

Using state-of-the-art telecommunication technologies, this project is developing a comprehensive knowledge resource for alfalfa (Medicago sativa L.); the National Alfalfa Information System (NAIS). This project will serve as an improved model for Extension educational programs. Alfalfa is the most important forage crop in the USA and grown worldwide for feeding millions of livestock and in many cropping systems. As a legume, it is important in sustaining the environment and the productivity of agriculture. Information needs are present in every state and internationally. The NAIS is being developed through national and international cooperation, putting the best science-based alfalfa information and …

Main-Stem Seepage And Base-Flow Recession Time Constants In The Niobrara National Scenic River Basin, Nebraska, 2016–18, Kellan R. Strauch, Philip J. Soeksen

United States Geological Survey: Water Reports and Publications

The Niobrara River of northern Nebraska is a valuable water resource that sustains irrigated agriculture and recreation, as well as a diverse ecosystem. Large-quantity withdrawals from the source aquifer system have the potential to reduce the flow into the river and to adversely affect the free-flowing condition of the Niobrara National Scenic River (NSR). Therefore, to understand the magnitude and characteristics of those flows, the United States Geological Survey (USGS), in cooperation with the National Park Service, began a study to quantify seepage gains/losses along the eastern half of the Niobrara NSR and to create a map characterizing the base-flow …

Map Based Www Tool For Recommending Forage Species, M. H. Hall, D. A. Miller, J. H. Cherney

IGC Proceedings (1977-2023)

Selecting the “best” forage species or species mixture requires a knowledge and understanding of the consuming animal, soil characteristics, and forage species. The multivariate nature of the problem presents challenges to those interested in solving the practical problem of maximizing available resources. Earlier work at Cornell University resulted in a WWW-based interface that allowed the user to provide a soil type or zip code and additional management factors to initiate the species selection. This approach relies on either user knowledge of soil series or an implied relationship between zip code and soil series that may often be wrong. To improve …

Remote Sensing Application To Grassland Monitoring, Z. B. Nan

IGC Proceedings (1977-2023)

Application of remote sensing to the management of grassland resources, the role this plays in developing sustainable grassland farming systems and opportunities for further development are outlined. Use of remote sensing technologies in grassland monitoring has a history of more than 30 years. Both fine- and coarse-grained remote sensing techniques are used to monitor and study grasslands. Fine-grained techniques are used to study landscape scale processes through the use of sensors providing spatial resolution of a few meters, whereas coarse-grained techniques are used to study catchment scale areas, and even entire biomes, using satellite-based sensors with a spatial resolution of …

Modelling Grassland Ecosystems, J. H. M. Thornley

IGC Proceedings (1977-2023)

In this contribution a view of the promise and difficulties of modelling grassland is given. This is largely centred around work with a grassland ecosystem simulator known as the Hurley Pasture Model.

A brief introduction sets forth possible reasons for building a large ecosystem model, and stresses the importance of modelling objectives. It is suggested that a model is de rigeur for any research programme which aims to take a firm grasp of the complex responses of grassland. Mechanistic models are required to provide the understanding needed for intelligent and flexible management of grassland, whatever the prevailing environmental or economic …

Estimating Herbage Mass In Stargrass (Cynodon Nlenfuensis Var Nlenfuensis) Using Sward Surface Height And The Rising Plate Meter, D. E. Oliveira, S. R. Medeiros, L. J. M. Aroeira, L. G. Barioni, D. P. D. Lanna

IGC Proceedings (1977-2023)

Estimation of herbage mass is necessary both in research and farm management. Methods for such estimations should be inexpensive, rapid and reliable. Since estimations through hand clipping are time consuming, a range of indirect methods have been developed and tested in the literature. This study had the aim of comparing precision of two indirect methods, sward surface height (SSH) and the rising plate meter (RPM), to estimate herbage mass in stargrass pastures (Cynodon nlenfuensis var. nlenfuensis). Pre-grazing measurements of SSH and RPM readings were taken and compared with the paddock herbage mass. RPM readings were converted into centimeters. Average …

Mgrre_Thinsections_12-A_4, Mgrre

Thin Sections

No abstract provided.

Mgrre_Thinsections_12-A_19, Mgrre

Thin Sections

No abstract provided.

Mgrre_Thinsections_12-A_22, Mgrre

Thin Sections

No abstract provided.

Mgrre_Thinsections_12-A_26, Mgrre

Thin Sections

No abstract provided.

Mgrre_Thinsections_12-A_29, Mgrre

Thin Sections

No abstract provided.

Mgrre_Thinsections_12-A_45, Mgrre

Thin Sections

No abstract provided.

Mgrre_Thinsections_12-A_51, Mgrre

Thin Sections

No abstract provided.

Mgrre_Thinsections_12-A_60, Mgrre

Thin Sections

No abstract provided.