Physical Sciences and Mathematics Commons^™

Experiments On The Inactivation Of Zinc By The Mineral Fractions Of The Soil, John J. Hassett

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Zinc deficiency, in many cases, is closely related to organic matter decomposition. DeRemer and Smith (1964) studied the effects of decomposing sugar beet tops on the reactions of Zn⁶⁵ in a Portneuf soil. They found that with time the Zn⁶⁵ associated with lime minerals, exchangeable, and water soluble fractions of the soil decreased, while that found with the organic and mineral fractions increased. This increase in the mineral fraction is of particular interest, since the majority of the Zn⁶⁵ was found to be with this fraction after a period of time. They also showed that the increase …

The Influence Of Irrigating With Saline Water On The Energy Status Of Water In Soil And Plant, Rolando H. Braun

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

1. Changes in the energy status of water that occurred in Milville silt loam and in bean (Phaseolus vulgaris L.) plants growing on it , during two consecutive 6-day periods while being irrigated with saline solutions, were studied.
2. Total soil water potential (Ψ soil) (measured with thermocouple psychrometers), matric-potential (Ψ_m) (measured with tensiometers) were considered. In leaf samples, the total water potential (leaf) and the osmotic potential (Ψ_π)--after freezing-- were determined with thermocouple psychrometers; by difference, the pressure potential (Ψ_p) was obtained.
3. There is no evidence of close relationship between changes taking place in …

Movement Of Atrazine In Soil Under Furrow Irrigation, Jyothi Veerabhadrappa

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Movement of atrazine in response to furrow irrigations was studied using the samples of Timpanogos silt loam soil. Distribution in soil profile of surface applied herbicide was determined by drawing samples of water extracts through porous cylinders. Atrazine quantity was determined by spectrophotometer.

It was observed that the herbicide found in the water extracts was an indication of the quantity present in the soil. The herbicide moved readily with the applied water. Irreversible thermodynamic model could not be applied because of the initial and final boundary conditions. The pattern of movement was in conformity with the chromatographic theory.

Water Levels In Observation Wells In Nebraska, 1966, C.F. Keech

Conservation and Survey Division

No abstract provided.

Earthworm Pits

Green Revolution

No abstract provided.

Earthworms: Their Intensive Propagation And Use In Biological Soil Building - Part Vi, Thomas Barrett

Green Revolution

Reprint of section of book Earthworms by Thomas Barrett.

Earthworms: Their Intensive Propagation And Use In Biological Soil Building - Part V, Thomas Barrett

Green Revolution

Reprint of section of book Earthworms by Thomas Barrett.

Stratigraphic Chart Of The Waubansee Group In Nebraska, R. R. Burchett, E. C. Reed

Conservation and Survey Division

No abstract provided.

Earthworms: In Biological Soil Building - Their Intensive Propagation And Use - Part Iv, Thomas Barrett

Green Revolution

Reprint of section of book Earthworms by Thomas Barrett.

Precambrian Well Data In Nebraska, Including Rock Type And Surface Configuration, Marvin P. Carlson

Conservation and Survey Division

This bulletin presents, in tabular form, information relating to the Precambrian surface and includes a configuration map of this surface in Nebraska. The data from all of the 1460 deep tests reaching the Precambrian as of January 1, 1966 are listed. It is anticipated that further studies utilizing this data will be made due to the important influence of the Precambrian surface on later sedimentation and structure and the possibility of minerals of economic importance being present in Precambrian rocks. Specific information for each well and samples, except as noted in the tabulation, are on file and available for study …

Earthworms: Their Intensive Propagation And Use In Biological Soil Building - Part Iii, Thomas Barrett

Green Revolution

Reprint of section of book Earthworms by Thomas Barrett.

A Geographical Interpretation Of Coles County Soils Through A Comparative Analysis Of Modern Soil Classification Systems, John C. Klink

Masters Theses

No abstract provided.

The Ord River Catchment Regeneration Project. 1. The Nature, Extent And Causes Of Erosion In The Ord River Catchment Area, K Fitzgerald

Journal of the Department of Agriculture, Western Australia, Series 4

OF the 17,800 square miles of Ord River catchment area, an estimated 1,450 square miles of country is subject to varying degrees of erosion.

This lies astride the Ord River and its major tributaries, the Elvire, Negri, Stirling, Panton, Turner, Nicholson and RB rivers.

The bulk of the eroded country lies in W.A. but part projects into the Northern Territory.

New Soils Chief Appointed, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

The appointment of Mr. S. T. Smith to the position of Commissioner of Soil Conservation and Chief of the Soils Division in the Department of Agriculture was announced last month.

Recommendations For The Establishment Of Harbinger Medic In The Northern Wheatbelt, R J. Parkin

Journal of the Department of Agriculture, Western Australia, Series 4

Harbinger is an early-maturing medic that has met with success on some soil types, especially in the northern wheatbelt.

Similar to Cyprus barrel medic but best suited to different soil types, harbinger adds to the range of pasture legumes available for sowing in under 16 in. annual rainfall areas.

The Australian Field Cricket, J A. Button

Journal of the Department of Agriculture, Western Australia, Series 4

THE Australian field cricket, or the black field cricket as it is sometimes known, is a native of Australia and is widely distributed throughout the south western, south and south eastern sections of the continent.

Centennial Guidebook To The Geology Of Southeastern Nebraska, R. R. Burchett, E. C. Reed

Conservation and Survey Division

No abstract provided.

Devonian Of The North-Central Region, United States, C. Collinson, Marv Carlson

Conservation and Survey Division

No abstract provided.

Nebraska Groundwater Level (Decline & Rise), 1967

Conservation and Survey Division

No abstract provided.

Centennial Guidebook To The Geology Of Southeastern Nebraska, R. R. Burchett, E. C. Reed

Conservation and Survey Division

No abstract provided.

Earthworms: Their Intensive Propagation And Use In Biological Soil Building - Part Ii, Thomas Barrett

Green Revolution

Reprint of section of book Earthworms by Thomas Barrett.

Twelve Maps Summarizing The Geologic Framework Of Southeastern Nebraska, R. R. Burchett, M. P. Carlson

Conservation and Survey Division

No abstract provided.

Tb23: Studies Concerning The Retention Of Organic Materials By Clays, David C. Frost, Harold W. Gausman

Technical Bulletins

The purpose for conducting this research reported was to investigate interlattice adsorption of organic materials by montmorillonite clay and clays obtained from Merrimac sandy loam and Suffield silt loam soils.

Surficial Geology Of The Las Vegas Quadrangle, Nevada, Charles Edgar Price Jr

UNLV Theses, Dissertations, Professional Papers, and Capstones

The Las Vegas 15-minute quadrangle, located in the south part of the state of Nevada, includes about 240 square miles in and around the city of Las Vegas; it is in the basin and range province. The quadrangle includes a broad valley floor that was once a lake bottom, a bordering area of badlands and rolling hills developed in Tertiary and Quaternary deposits, an outer marginal area of alluvial fans, and the surrounding mountains.

The mountains constitute about three per cent of the total land surface and are composed of rock ranging in are from Precambrian to Tertiary. The remainder …

Availability And Use Of Water In Nebraska, F. Butler Shaffer

Conservation and Survey Division

No abstract provided.

Nitrification In Three Different Soils In Polyethylene Bags In The Field Overwinter, William R. Olmstead

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Nitrification, the process whereby ammonical-nitrogen (NH₄⁺ - N) is changed into nitrate-nitrogen (NO₃^--N), is one of the more important biochemical processes associated with agriculture. Nitrate appears to be the form of N that most crops can most readily utilize.

The Effect Of Soil Adsorbents On The Thermodynamic Properties Of Soil Water System, Taghi Manbeian

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

It has been generally recognized that the surface phenomena of the solid particles such as shrinking and swelling, water- holding capacity, water' movement, and cation exchange are important in understanding the physical properties of the soil. Clay is the most prevalent material in the colloidal fraction of many soils. Because of the complex nature of the surface of clays and the small size of the particles, the direct study of surface phenomena is difficult. Thermodynamic functions change in accordance with changes and organization within the system. Thus, an examination of the thermodynamics of surface phenomena provides some understanding of the …

The Influence Of Soil Moisture Regimes And Atmospheric Environments On Transpiration And The Energy Status Of Water In Plants, Sampatrao A. Gavande

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Plant responses to different soil moisture regimes have been extensively studied. Because of interactions between the soil, plant and climatic factors, few convincing generalizations concerning the influence of soil water on the transpiration of water by plants have been established. Generally single factors or at most the interaction of two have been studied at any one time. Useful theories describing the conditions of water retention in plant tissues and movement of water through plants have been proposed. Equally useful theories have been suggested for describing the retention and transmission of water in soil. The integration of these theories and their …

Simultaneous Movement Of Water And Herbicides In Unsaturated Soils, Ming-Shyong Yang

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Since weed killers were developed in the early part of the decade beginning in 1940, herbicides have been increasing in use until they are now widely used to control weeds. The application of herbicides has thus become a regular agricultural and ecological practice.

Simultaneous Flow Of Heat And Water In Plant Tissue, Gaylon Sanford Campbell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Although biological phenomena may be partially described in a general way without the use of mathematics and physics, the experimental results may be more meaningful if they are analyzed on the basis of physical and mathematical laws. The complexity of biological systems has made the application to them of mathematics and physics rather difficult, and only recently has much progress been made. Although it has yet been possible to describe only a few simple biological systems by actual equations, a great deal of qualitative information may be obtained by applying physics and mathematics. Russell (1960, p. 439) said

In principle …