Farm tractors : their care, operation and maintenance

Cover title

Plow adjustment and operation

"May, 1942.""Reprinted, October 1946.""A properly adjusted plow will give real satisfaction to the operator through better work, lighter draft, and less wear on shares and other parts. Different plowing conditions are often encountered even on a single farm. Therefore plows need to be readjusted frequently. It is the purpose of this circular to outline the more important plow adjustments."--Page 1.23 pages : illustration

English Studies as a Site for Healing: A Conversation about Place-Based and Indigenous Pedagogies in the English Classroom

This article summarizes a roundtable discussion from the 2016 Alaska Native Studies Conference among professors and students from two English Studies courses at the University of Alaska Anchorage: History of the English Language and History of Rhetoric. Jennifer and Heather discuss how the courses are traditionally taught and how they redesigned the courses to incorporate place-based and indigenous pedagogies. Then, Tayler, Samantha, Hailey, and Arlo--students from a range of backgrounds who took one or both of the classes--describe how the courses encouraged them to develop critical perspectives, build new knowledge through undergraduate research, and experience personal and professional transformations that led to advocacy. The dialogue provides a range of pedagogical perspectives and considers English Studies as a potential site for cultural and historical healing.Ye

VSX J003909.7+611233: a new slowly pulsating B (SPB) star in Cassiopeia?

We report the discovery of a new 13th magnitude variable star in Cassiopeia close to the variable KP Cas.Analysis of six days of intensive photometry shows a regular, near sinusoidal modulation with an amplitude of 0.024 mag and a period of 0.43815(31)d.Although its colour indicates a spectral type around F0 the star probably suffers up to 2−2.5 magnitudes of extinction, so could be an Aor B-type star. Given the period, the low amplitude, the shape of the lightcurve and the probable spectral type we consider it most likely to be a slowly pulsating B-type (SPB) star.The variable has been registered in the International Variable Star Index with the identifier VSX J003909.7+611233

Table beets : western Oregon -- west of Cascades [2000]

Good management practices are essential if optimum fertilizer responses are to be realized. These practices include use of recommended varieties, selection of adapted soils, weed control, disease and insect control, good seedbed preparation, proper seeding methods, and timely harvest. Because of the influence of soil type, climatic conditions, and other cultural practices, crop response from fertilizer may not always be accurately predicted. Soil test results, field experience, and knowledge of specific crop requirements help determine the nutrients needed and the rate of application. The fertilizer application for vegetable crops should ensure adequate levels of all nutrients; optimum fertilization is essential for top quality and yields. Follow recommended soil sampling procedures in order to estimate fertilizer needs. The Oregon State University Extension Service agent in your county can provide you with soil sampling instructions, soil sample bags, and information sheets. Recommendations are based on a 24-inch row spacing.Revised November 1984. Reprinted January 2000. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo

Genetic control of invasive plants species using selfish genetic elements

Invasive plants cause substantial environmental damage and economic loss. Here, we explore the possibility that a selfish genetic element found in plants called cytoplasmic male sterility (CMS) could be exploited for weed control. CMS is caused by mutations in the mitochondrial genome that sterilize male reproductive organs. We developed an analytical model and a spatial simulation to assess the use of CMS alleles to manage weed populations. Specifically, we examined how fertility, selfing, pollen limitation and dispersal influenced extinction rate and time until extinction in populations where CMS arises. We found that the introduction of a CMS allele can cause rapid population extinction, but only under a restricted set of conditions. Both models suggest that the CMS strategy will be appropriate for species where pollen limitation is negligible, inbreeding depression is high and the fertility advantage of females over hermaphrodites is substantial. In general, spatial structure did not have a strong influence on the simulation outcome, although low pollen dispersal and intermediate levels of seed dispersal tended to reduce population extinction rates. Given these results, the introduction of CMS alleles into a population of invasive plants probably represents an effective control method for only a select number of species

Logistics of community smallpox control through contact tracing and ring vaccination: a stochastic network model

BACKGROUND: Previous smallpox ring vaccination models based on contact tracing over a network suggest that ring vaccination would be effective, but have not explicitly included response logistics and limited numbers of vaccinators. METHODS: We developed a continuous-time stochastic simulation of smallpox transmission, including network structure, post-exposure vaccination, vaccination of contacts of contacts, limited response capacity, heterogeneity in symptoms and infectiousness, vaccination prior to the discontinuation of routine vaccination, more rapid diagnosis due to public awareness, surveillance of asymptomatic contacts, and isolation of cases. RESULTS: We found that even in cases of very rapidly spreading smallpox, ring vaccination (when coupled with surveillance) is sufficient in most cases to eliminate smallpox quickly, assuming that 95% of household contacts are traced, 80% of workplace or social contacts are traced, and no casual contacts are traced, and that in most cases the ability to trace 1–5 individuals per day per index case is sufficient. If smallpox is assumed to be transmitted very quickly to contacts, it may at times escape containment by ring vaccination, but could be controlled in these circumstances by mass vaccination. CONCLUSIONS: Small introductions of smallpox are likely to be easily contained by ring vaccination, provided contact tracing is feasible. Uncertainties in the nature of bioterrorist smallpox (infectiousness, vaccine efficacy) support continued planning for ring vaccination as well as mass vaccination. If initiated, ring vaccination should be conducted without delays in vaccination, should include contacts of contacts (whenever there is sufficient capacity) and should be accompanied by increased public awareness and surveillance

Broccoli, Brussels sprouts, cabbage, cauliflower : western Oregon - west of Cascades [1983]

Revised July 1983. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo