Use of LANDSAT-1 data for the detection and mapping of saline seeps in Montana

The author has identified the following significant results. April, May, and August are the best times to detect saline seeps. Specific times within these months would be dependent upon weather, phenology, and growth conditions. Saline seeps can be efficiently and accurately mapped, within resolution capabilities, from merged May and August LANDSAT 1 data. Seeps were mapped by detecting salt crusts in the spring and indicator plants in the fall. These indicator plants were kochia, inkweed, and foxtail barley. The total hectares of the mapped saline seeps were calculated and tabulated. Saline seeps less than two hectares in size or that have linear configurations less than 200 meters in width were not mapped using the LANDSAT 1 data. Saline seep signatures developed in the Coffee Creek test site were extended to map saline seeps located outside this area

Is a Simple Collisionless Relic Dark Matter Particle Ruled Out?

The central densities of dark matter (DM) halos are much lower than predicted in cold DM models of structure formation. Confirmation that they have cores with a finite central density would allow us to rule out many popular types of collisionless particle as candidates for DM. Any model that leads to cusped halos (such as cold DM) is already facing serious difficulties on small scales and hot DM models have been excluded. Here I show that fermionic warm DM is inconsistent with the wide range of phase space densities in the DM halos of well-observed nearby galaxies.Comment: 6 pages, 1 figure, LaTeX uses emulateapj.sty, revised version to appear in ApJ Letters. Argument clarified and strengthened in response to criticism, conclusions little change

Land use mapping in Erie County, Pennsylvania: A pilot study

The author has identified the following significant results. A pilot study was conducted to determine the feasibility of mapping land use in the Great Lakes Basin area utilizing ERTS-1 data. Small streams were clearly defined by the presence of trees along their length in predominantly agricultural country. Field patterns were easily differentiated from forested areas; dairy and beef farms were differentiated from other farmlands, but no attempt was made to identify crops. Large railroad lines and major highway systems were identified. The city of Erie and several smaller towns were identified, as well as residential areas between these towns, and docks along the shoreline in Erie. Marshes, forests, and beaches within Presque Isle State Park were correctly identified, using the DCLUS program. Bay water was differentiated from lake water, with a small amount of misclassification

DDT for the protection of stored potatoes

At the strengths used, DDT, derris and pyrethrum-piperonyl butoxide as dusts and DDT-impregnated Chapman sacks and sugar-bags were all efficacious in protecting stored tubers when the initial infestation was less than 4 P.er cent. DDT dusts, ranging in concentration from 0.5 to 2 per cent., and containers treated in DDT emulsions ranging in concentration from 0.5 to 2.5 per cent. arrested infestations varying from 8 to 35 per cent. satisfactorily. The higher levels of DDT were more efficacious, however, when the initial infestation exceeded 20 per cent. Results with pieces of DDT-impregnated burlap and DDT-treated paper strips placed among the tubers were not conclusive. A 2 per cent. DDT dust applied at the rate of 1 lb. per bag, and a dipping strength of 2 per cent. DDT emulsion for impregnating containers, were considered the most efficacious for general application in the field. Second-hand lightweight hessian sugar-bags provide a satisfactory alternative to the standard Chapman sacks for storing tubers. Multiple-layered paper bags are not suitable for storing tubers under Queensland conditions. Quantities of DDT are transferred to tubers when DDT-impregnated containers are handled. DDT residues on tubers, whether acquired from the container or from dust application, persist during storage but are reduced to within safe limits during handling from store and preparation for the table

New genera and species of Dacinae (Trypetidae, Diptera) from Queensland

During studies concerned with the ecology, recording of native hosts and control of the economic species of fruit flies occurring in Queensland, three new species of Dacinae have been discovered. Two of these have been bred from their native hosts, while all three were caught in lure traps placed in either citrus or deciduous fruit orchards. Two new genera - Neozeugodacus (genotype, N. aureus) and Diplodacus (genotype, Dacus signatifer Tryon) - have been established. New species described in addition to Neozeugodacus aureus are Strumeta mutabilis and Afrodacus mesoniger

The cotton jassid problem in Queensland

The cotton jassid (Empoasca masculata) affecting American Upland varieties of cotton grown in Queensland is shown to differ from the more important species affecting species elsewhere in that it restricts its activity to the terminal growth of the plant. Soil condition, cultural treatment, time of planting, and variety of cotton are shown to influence plant susceptibility to jassid injury. The breeding of jassid-resistant varieties is stated to be the only control measure which is likely to practicable

Jassid resistance in the cotton plant

Terminal injury by jassids, expressed as grades of plant reaction, can be related to the nymphal population, irrespective of variety and state of growth of the crop. This association enables a determination of varietal susceptibility based on injury symptoms. For each variety, susceptibility to jassid attack can be expressed as a plant resistance index. The method of sampling populations and the various grades of plant reaction recognised from normality to the extreme of jassid damage are described

Potato tuber moth (Gnorimoschema operculella (Zell.)) investigations in southern Queensland

Three (sometimes two) applications of 1 lb DDT per acre at fortnightly intervals prevented infestation of tops during most of the growing period of the spring-planted crop and reduced the likelihood of tuber infestation. DDT was more effective as a spray than a dust; sprays produced increases of up to 17% in number and 43% in weight of table quality tubers. The proper integration of DDT spraying and hilling is essential for Gnorimoschema control, as each fulfils a separate but complementary role in ensuring the maximum production of sound tubers

Electron beam chemistry produces high purity metals

Application of radiation chemistry for deposition of metals by irradiation of aqueous solutions with high energy electrons is presented. Design of reaction vessel for irradiation of solution is illustrated. Features of radiochemical technique and procedures followed are described

PROFITABILITY OF ESTABLISHING BASIN WILDRYE FOR WINTER GRAZING

This study examined the economic viability of establishing basin wildrye for winter grazing. Mixed integer-programming models were developed that minimized cow feed costs. Estimated basin wildrye establishment costs were $154 per acre. Break-even basin wildrye yields were approximately 2.6 and 2.3 AUMs/acre for March and May calving scenarios, respectively.Livestock Production/Industries,