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| 11. |
Precocious Flowering of Black Cherry Related to Altitudinal Source |
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Canadian Journal of Forest Research,
Volume 2,
Issue 1,
1972,
Page 57-58
R. E. Farmer Jr.,
P. E. Barnett,
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摘要:
Black cherry (PrunusserotinaEhrh.) seedlings from low elevation sources (300–490 m) in the southern Appalachian mountains formed floral buds during their initial growing season; seedlings from high elevations (1150–1475 m) did not exhibit first year floral initiation.
ISSN:0045-5067
DOI:10.1139/x72-011
出版商:NRC Research Press
年代:1972
数据来源: NRC
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| 12. |
Gaseous Loss of Ammonia Following Urea Application in a Balsam Fir Forest |
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Canadian Journal of Forest Research,
Volume 2,
Issue 1,
1972,
Page 59-62
B. Bernier,
M. Brazeau,
C. H. Winget,
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摘要:
Nitrogen losses through ammonia volatilization increased with increasing rates of application and were 6.8% of 112 kg urea-N/ha after 10 days. Initial humus moisture content within the limits studied affected volatilization rates in the first days but had little effect on overall losses. A discontinuous ammonia-trapping technique for field use is discussed.
ISSN:0045-5067
DOI:10.1139/x72-012
出版商:NRC Research Press
年代:1972
数据来源: NRC
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| 13. |
Frost Damage to White Spruce Buds |
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Canadian Journal of Forest Research,
Volume 2,
Issue 1,
1972,
Page 62-63
J. R. Clements,
J. W. Fraser,
C. W. Yeatman,
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PDF (162KB)
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摘要:
Unopened buds of white spruce (Piceaglauca(Moench) Voss) were damaged by late spring frost. At time of death of the apical meristem the buds were not ready for flushing. As expected on the basis of ground frosts, there was more damage among shorter trees than among taller trees, and more damage among open-grown trees than among understory trees.
ISSN:0045-5067
DOI:10.1139/x72-013
出版商:NRC Research Press
年代:1972
数据来源: NRC
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