Earth Sciences Commons^™

Arkansas Rice Research Studies 1991, B. R. Wells

Arkansas Agricultural Experiment Station Research Series

The research reports in this publication represent one year of results; therefore, these results should not be used as a basis for longterm recommendations. Several research reports in this publication dealing with soil fertility also appear in Arkansas Soil Fertility Studies 1991, Arkansas Agricultural Experiment Station Research Series 421. This duplication is the result of the overlap in research coverage between the two series and our effort to inform Arkansas rice producers of all the research being conducted with funds from the rice check-off.

Arkansas Soil Fertility Studies 1991, Wayne E. Sabbe

Arkansas Agricultural Experiment Station Research Series

Contained within this publication are progress reports on the specific aspects of the soil fertility program at the University of Arkansas in 1991. In most instances, the reports are not final reports, but they may contain data from several years. Further details on each report can be obtained from the respective project leaders.

Carbon And Nitrogen Isotopic Signatures Of Bat Guanos As A Record Of Past Environments, Hiroshi Mizutani, Donald A. Mcfarlane, Yuko Kabaya

WM Keck Science Faculty Papers

Carbon and nitrogen isotope ratios were measured for various ecogeochemical samples relevant to bat guano ecosystems. In particular, ca. 800-year-old subfossil guano from Jackson's Bay Cave Compex, Jamaica, yielded ratios similar to the modern guano from other Jamaican bat caves but quite different from modern guano of the same area. Diagenetic change and differences in bat food habits were unlikely explanations for the observation. Instead, insects that feed on C4 and CAM plants were the main prey for the bats in present Jackson's Bay area, while the ultimate source of organic matter for bats in other Jamaican caves and for …

Nitrogen And Carbon Isotope Studies Of A Bat Guano Core From Eagle Creek Cave, Arizona, Usa, Hiroshi Mizutani, Donald A. Mcfarlane, Yuko Kabaya

WM Keck Science Faculty Papers

Nitrogen and carbon isotope ratios were studied in a stratified deposit of guano of Mexican Free-tailed bats in Eagle Creek Cave, Arizona, U.S.A. Little diagenetic change was observed over the 25-year time span of the guano deposit. High aridity and reduced circulation of air in the cave are hypothesized to have slowed the normally rapid decomposition of the excreta and the subsequent escape of resultant ammonia. The results suggest the high dependency of the speed of diagenetic change on specific physical and other conditions of the caves and indicate that great care need be exercised in the interpretation of the …

Quantifying Loss Of Yield Potential Due To Leaf Disease., B A. Peters, R Loughman

Experimental Summaries - Plant Research

To determine the impact of Septoria and barley yellow dwarf virus on wheat grown under the package approach on the south coast using different levels of fungicide and insecticide control on a susceptible variety of an appropriate maturity for early sowing.

Examine if there is any benefit for disease control of S. tritici from Baytan seed dressing. 92AL16.

Time of sowing and variety effects on the Septoria diseases of wheat. 92AL17.

Time of sowing effect on barley foliar diseases. 92AL19.

Evaluating variety mixtures to reduce Septoria using a range of lines. 92AL24.

Fungicides for control of Septoria nodorum of wheat. …

Soils And Landforms Of The Manjimup Area, Western Australia, Hugh Maxwell Churchward

Land resources series

No abstract provided.

Land Resources Map In The Southern Section Of The Peel-Harvey Catchment, Swan Coastal Plain, Western Australia, Dennis Van Gool, Bev Kipling

Land resources series

Soil-Landscape map prepared to assist nutrient management and land use planning in the southern section of the Peel-Harvey catchment.

Fodder Trees And Shrubs For High Rainfall Areas Of South Western Australia, Daya Patabendige, P R. Scott, Edward C. Lefroy

Resource management technical reports

In south Western Australia, the lack of good quality feed in late summer and autumn is a major constraint to livestock production. This feed gap is usually filled by costly supplementary hand feeding of grain or hay. The ability of some trees and shrubs to provide good quality forage during summer and autumn has generated interest for many years (Corbett, 1951; Everist, 1969; Snook, 1987;Oldham et al., 1991, Lefroy, 1991). The dual benefits of reducing the need for supplementary hand feeding and deferring the grazing of annual pastures until they are well established has recently led to the recognition of …