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Author : Donald L. Copes,William K. Randall
Publisher : Unknown
Page : 8 pages
File Size : 51,8 Mb
Release : 1983
Category : Forest machinery
ISBN : MINN:31951D029863547
Author : Donald L. Copes
Publisher : Unknown
Page : 128 pages
File Size : 53,7 Mb
Release : 1983
Category : Electronic
ISBN : OCLC:880504805
Author : Donald L. Copes
Publisher : Forgotten Books
Page : 24 pages
File Size : 49,9 Mb
Release : 2018-09-09
Category : Technology & Engineering
ISBN : 1390469948
Excerpt from Tree Shaking Machine Aids Cone Collection in a Douglas-Fir Seed Orchard Orchard managers are reluctant about using shakers until it can be demonstrated that such mechanized harvesting methods are nondestructive. We decided to conduct a shaker trial in a Douglas-fir seed orchard during the 1982 cone harvest to determine if mature cones could be harvested from 7 to 9-m tall orchard trees without causing excessive tree damage. Specific evaluations were percentage of cone removal, amount of top breakage, the relationship of cone removal with amount of top breakage, and effect on cone removal and top breakage of balanced versus unbalanced weights in the shaker head. Tree shaking was carried out at the Beaver Creek seed orchard of the usda Forest Service near Corvallis, Oregon, during the last week of August 1982. Ninety-two trees were shaken. Evaluation of percent cone removal and top damage is reported on 10 to 14-year-old grafted Douglas-fir trees. Trees ranged in height from 7 to 9-m and had stern diameters that ranged from 9 to 25 cm as measured 30 cm above the graft unions. The orchard consisted of ten 2-ha blocks, but trees in only four of the blocks were shaken. Each block contained approximately 300 trees, or 10 to 15 ramets of 25 clones. Some trees produced good cone crops, but the proportion of producing trees were small. The same clones were not present in more than one block, so comparisons of treatments between blocks are limited. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author : Anonim
Publisher : Unknown
Page : 374 pages
File Size : 51,5 Mb
Release : 1982
Category : Forests and forestry
ISBN : UCBK:C042266866
Author : Anonim
Publisher : Unknown
Page : 1240 pages
File Size : 48,8 Mb
Release : 2009
Category : Electronic
ISBN : MINN:31951D02850989J
Author : Anonim
Publisher : Unknown
Page : 28 pages
File Size : 46,9 Mb
Release : 1985
Category : Forests and forestry
ISBN : MINN:30000006004521
Author : United States. Forest Service
Publisher : Forest Service
Page : 1240 pages
File Size : 48,6 Mb
Release : 2008
Category : Gardening
ISBN : MINN:30000009395322
Author : Anonim
Publisher : Unknown
Page : 104 pages
File Size : 53,7 Mb
Release : 1999
Category : Tree planting
ISBN : OSU:32435069456234
Some no. include reports compiled from information furnished by State Foresters (and others)
Author : Anonim
Publisher : Unknown
Page : 260 pages
File Size : 47,9 Mb
Release : 1997
Category : Tree planting
ISBN : UOM:39015085222837
Some no. include reports compiled from information furnished by State Foresters (and others).
Author : Anonim
Publisher : Unknown
Page : 176 pages
File Size : 43,7 Mb
Release : 2007
Category : Douglas fir
ISBN : MINN:31951D02974976P
Silvicultural practices in the Douglas-fir region evolved through a combination of formal research, observation, and practical experience of forest managers and silviculturists, and changing economic and social factors. This process began more than a century ago and still continues. It has had a great influence on the economic well-being of the region and on the present characteristics of the regions forests. This long history is unknown to most of the public, and much of it is unfamiliar to many natural resource specialists outside (and even within) the field of silviculture. We trace the history of how we got where we are today and the contribution of silvicultural research to the evolution of forest practices. We give special attention to the large body of information developed in the first half of the past century that is becoming increasingly unfamiliar to both operational foresters andperhaps more importantlyto those engaged in forestry research. We also discuss some current trends in silviculture and silviculture-related research.
Author : Anonim
Publisher : Unknown
Page : 618 pages
File Size : 51,6 Mb
Release : 2007
Category : Forests and forestry
ISBN : CORNELL:31924101545782
Author : Anonim
Publisher : Unknown
Page : 1252 pages
File Size : 51,8 Mb
Release : 1984
Category : Government publications
ISBN : UIUC:30112063912148
Author : Anonim
Publisher : Unknown
Page : 956 pages
File Size : 55,8 Mb
Release : 2024-06-30
Category : Government publications
ISBN : WISC:89015139157
Author : Anonim
Publisher : Unknown
Page : 158 pages
File Size : 54,9 Mb
Release : 1979
Category : Trees
ISBN : MINN:31951P00639303S
Author : Anonim
Publisher : Unknown
Page : 920 pages
File Size : 55,6 Mb
Release : 1985
Category : AGRIS (Information retrieval system)
ISBN : PSU:000012173570
