Download or read book Comparative Study on the Photosynthesis of Various Ecotypes of Scots Pine written by Wlodzimierz Żelawski and published by . This book was released on 1969 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Completed Foreign Agricultural Research Grants written by United States. Science and Education Administration. International Programs Staff and published by . This book was released on 1978 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Foreign Agricultural Research Grants Completed Under the Special Foreign Currency Program under Public Law 480 Sections 104 b 1 and 104 b 3 written by United States. Agricultural Research Service. International Programs Division and published by . This book was released on 1977 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of Agriculture Appropriations written by United States. Congress. House. Committee on Appropriations and published by . This book was released on 1964 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hearings Reports and Prints of the House Committee on Appropriations written by United States. Congress. House. Committee on Appropriations and published by . This book was released on 1964 with total page 1648 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of Agriculture Appropriations for 1965 written by United States. Congress. House. Committee on Appropriations and published by . This book was released on 1964 with total page 1860 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of Agriculture Appropriation Bill written by United States. Congress. House. Committee on Appropriations and published by . This book was released on 1965 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Progress Report of Research the Forest Service written by United States. Forest Service and published by . This book was released on 1968 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Agricultural research service Cooperative state research service Extension service Farmer cooperative service Economic research service written by United States. Congress. House. Committee on Appropriations and published by . This book was released on 1965 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Agricultural Library Catalog written by National Agricultural Library (U.S.) and published by . This book was released on 1978 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book OTS written by United States. Department of Commerce. Office of Technical Services and published by . This book was released on 1976 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of Agriculture Appropriations for 1966 written by United States. Congress. House. Committee on Appropriations and published by . This book was released on 1965 with total page 1820 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hearings written by United States. Congress. House and published by . This book was released on 1965 with total page 3130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Productivity of Photosynthesis in Forest Trees in Dependance on Various Environmental Conditions written by Włodzimierz Żelawski and published by . This book was released on 1974 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physiological Ecology of the Alpine Timberline written by W. Tranquillini and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the European Alps the importance of forests as protection against ava lanches and soil erosion is becoming ever clearer with the continuing increase in population and development of tourism. The protective potential of the moun tain forests can currently only be partially realised because a considerable propor tion of high-altitude stands has been destroyed in historical times by man's extensive clearing ofthe forests. The forests still remaining are of limited effec tiveness, due to inadequate density of trees and over-maturity. Considerable efforts, however, are now being made in the Alps and other mountains of the globe to increase the high-altitude forested area through reforestation, to raise depressed timberlines, and to restore remaining protection forests using suit able silvicultural methods to their full protective value. This momentous task, if it is to be successful, must be planned on a sound foundation. An important prerequisite is the assembly of scientific facts con cerning the physical environment in the protection forest zone of mountains, and the course of various life processes of tree species occurring there. Since the introduction of practical field techniques it has been possible to investigate successfully the reaction of trees at various altitudes to recorded factors, and the extent to which they are adapted to the measured situations. Such ecophysio logical studies enable us to recognize the site requirements for individual tree species, and the reasons for the limits of their natural distribution.

Download or read book Forest Service Research Accomplishments written by and published by . This book was released on 1972 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Impact of Air Pollutants on Southern Pine Forests written by Susan Fox and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: The public's attitude toward air pollution in the United States evolved substantially during the 1960s. One of the results of the nation's emerging environmental ethic was the creation of the U. S. Environmental Protection Agency (EPA) in December of 1970. Prior to this time, research was focused on the impacts of air pollution on human health and welfare and was largely conducted by several federal research agencies, which included the Department of Health, Education, and Welfare; the National Oceanic and Atmospheric Administration; and the U. S. Department of Agricul ture. After the creation of the EPA, much of this work was consolidated in one regulatory agency, which resulted in periodic evaluations of the various effects of atmospheric pollution on human health, materials, agriculture, and forest ecosystems. At the same time that environmental interest was growing in the United States, concern increased in the European scientific community and public over the ecological impacts of acidic deposition. As the magnitude of the damage to European lakes and streams and the widespread decline in Norway spruce and silver fir was reported, concern that similar problems were occurring in the United States increased substantially. This concern was heightened by press reports of high elevation spruce-fir forest declines in the Adirondack and Appalachian Mountains and the decline and death of sugar maples in the northeastern United States and Canada.