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59 results for "Department of Agriculture"
Raising Native Plants in Nurseries: Basic Concepts By United States Department of Agriculture
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This booklet was written for the novice who wants to grow native plants and may also wonder what is involved in starting a nursery. If you think that operating your own native plant nursery as a... More > business is your calling, then this manual, and particularly this first chapter, can help you move forward. If, however, you plan to grow native plants for fun, perhaps for use around your home or as a science fair project, this manual can still give you the basic information required for you to be successful, and all the concepts provided in this chapter are still applicable.< Less
North American Species of Cactus By U. S. Department of Agriculture
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In the fall of 1890 Dr. George Vasey, then Botanist of the Department of Agriculture, arranged with me to prepare a revision of North American Cactaceae. Owing to the peculiar difficulty... More > of preserving material the family was poorly represented, even in our leading herbaria. To secure a large amount of additional material in the way of specimens and field notes the Department authorized me to visit the region of the Mexican boundary during the summer of 1891. Preliminary to this exploration it was necessary to examine the Engelmann collection of Cactaceae, in the possession of the Missouri Botanical Garden. This collection, supplemented by the continual additions made at the garden, is by far the largest collection of skeletons and living specimens in this country, and also contains the large majority of our types.< Less
North American Species of Cactus By U. S. Department of Agriculture
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In the fall of 1890 Dr. George Vasey, then Botanist of the Department of Agriculture, arranged with me to prepare a revision of North American Cactaceae. Owing to the peculiar difficulty... More > of preserving material the family was poorly represented, even in our leading herbaria. To secure a large amount of additional material in the way of specimens and field notes the Department authorized me to visit the region of the Mexican boundary during the summer of 1891. Preliminary to this exploration it was necessary to examine the Engelmann collection of Cactaceae, in the possession of the Missouri Botanical Garden. This collection, supplemented by the continual additions made at the garden, is by far the largest collection of skeletons and living specimens in this country, and also contains the large majority of our types.< Less
Tomato Diseases By United States Department of Agriculture
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Tomato Diseases And Their Control by S.P. Doolittle, A.L. Taylor, L.L. Danielson. USDA Agricultural Handbook CONTENTS Types of diseases Diseases caused by bacteria and fungi
Climate Change, Carbon, and Forestry in Northwestern North America: Proceedings of a Workshop November 14 - 15, 2001 Orcas Island, Washington By United States Department of Agriculture
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Forest resource issues have been on the front page of newspapers in northwestern North America for the past two decades. Superimposed on the complexity of managing ecosystems is growing concern about... More > increasing temperatures and other aspects of changes in the atmospheric environment. Managers of public and private forestlands face increasing pressures to include climate change issues, particularly the disposition of carbon, in long term management plans. Management, economic and policy approaches to carbon flows in natural resources are evolving rapidly.< Less
Engineering Properties of Douglas-fir Lumber Reclaimed from Deconstructed Buildings By Department of Agriculture United States
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A vast wood resource exists in our Nation’s wood-framed building infrastructure. As the buildings in this infrastructure age and are remodeled or removed for redevelopment, the wood framing... More > residing in these buildings has the potential to be recovered for reuse. However, little technical information exists on the residual engineering properties of reclaimed dimensional lumber. Our study was undertaken to quantify the engineering strength and stiffness of dimensional Douglas-fir 2-by lumber recovered from building dismantlement or deconstruction. These data can serve as a basis for establishing formal recognition of this resource in current grading rules and engineering design standards< Less
Climate Change and Agriculture in the United States: Effects and Adaptation By U.S. Department of Agriculture
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Increases of atmospheric carbon dioxide (CO2), rising temperatures, and altered precipitation patterns will affect agricultural productivity. Increases in temperature coupled with more variable... More > precipitation will reduce productivity of crops, and these effects will outweigh the benefits of increasing carbon dioxide. Effects will vary among annual and perennial crops, and regions of the United States; however, all production systems will be affected to some degree by climate change. Agricultural systems depend upon reliable water sources, and the pattern and potential magnitude of precipitation changes is not well understood, thus adding considerable uncertainty to assessment efforts. Livestock production systems are vulnerable to temperature stresses. An animal’s ability to adjust its metabolic rate to cope with temperature extremes can lead to reduced productivity and in extreme cases death.< Less
Technical Guide to Managing Ground Water Resources By U.S. Department of Agriculture
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Ground water is the Nation’s principal reserve of fresh water and represents much of its potential future water supply. Ground water on National Forest System (NFS) lands is a major contributor... More > to flow in many streams and rivers and has a strong influence on the health and diversity of plant and animal species in forests, grasslands, riparian areas, lakes, wetlands, and cave systems. It also provides drinking water to hundreds of communities. Demands for safe drinking water and requirements to maintain healthy ecosystems are increasing, and complex social and scientific questions have arisen about how to assess and manage the water resources on NFS lands. This technical guide was developed to help address these issues. It describes the national ground water policy and provides management guidelines for the NFS.< Less
Soil Survey Manual By U.S. Department of Agriculture
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The Soil Survey Manual provides in a single volume the major principles and practices needed for making and using soil surveys and for assembling and using data related to them. The Manual is... More > intended primarily for use by soil scientists engaged in the classification and mapping of soils and in the interpretation of soil surveys. Although the Manual is oriented to the needs of those actively engaged in preparing soil surveys for publication, workers and students who have limited soils experience or are less familiar with the soil survey process also will be able to use the information.< Less
Soil Survey Laboratory Information Manual - Soil Survey Investigations Report No. 45 (Version 2.0) By U.S. Department of Agriculture
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For any measurement program that collects analytical data over a long period of time for comparative purposes, the quality and credibility of those data are critical (Taylor, 1988). It is equally... More > critical that the data can be easily understood by the user. The uses of these data include, but are not limited to, routine soil characterization, special analyses, soil classification, interpretations, and soil genesis and geomorphology studies. Because of the diverse uses of these data, it follows that pedon characterization data, or any soil survey data, are more appropriately used when the operations for collection, analysis, and reporting of these data are well understood. Results differ when different methods are used, even though these methods may carry the same name or concept. Comparison of one bit of data with another is difficult without knowing how both bits were gathered. As a result, operational definitions have been developed and are linked to specific methods.< Less