scholarly journals Response of walnut aphid populations to increasing foliar nitrogen content

2015 ◽  
Vol 17 (3) ◽  
pp. 277-284 ◽  
Author(s):  
Kevi C. Mace ◽  
Nicholas J. Mills
Keyword(s):  
Nitrogen Content ◽  
Foliar Nitrogen ◽  
Aphid Populations

scholarly journals Aplicações de glyphosate: Desempenho de soja transgênica, comunidade bacteriana e teor de nitrogênio foliar / Glyphosate applications: Performance of transgenic soy, bacterial community and foliar nitrogen content

2021 ◽  
Vol 7 (10) ◽  
pp. 99306-99322
Author(s):  
Evelin Regina Albano Balastrelli ◽  
Miriam Hiroko Inoue ◽  
Júlia Rodrigues Novais ◽  
Kassio Ferreira Mendes ◽  
Ana Carolina Dias Guimarães ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Nitrogen Content ◽  
Foliar Nitrogen

Five-year growth responses of Douglas-fir, western hemlock, and western redcedar seedlings to manipulated levels of overstory and understory competition

2006 ◽  
Vol 36 (10) ◽  
pp. 2439-2453 ◽  
Author(s):  
Timothy B Harrington
Keyword(s):  
Growth Rate ◽  
Nitrogen Content ◽  
Douglas Fir ◽  
Western Hemlock ◽  
Volume Index ◽  
Stem Volume ◽  
Western Redcedar ◽  
Foliar Nitrogen ◽  
Relative Growth ◽  
Vegetation Control

Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), western hemlock (Tsuga heterophylla (Raf.) Sarg.), and western redcedar (Thuja plicata Donn ex D. Don) seedlings were planted in March 2001 within three clearcut-harvested, shelterwood, or thinned stands of mature Douglas-fir near Olympia, Washington. From 2002 to 2005, areas of vegetation control of 0, 4.5, or 9 m2 were maintained with herbicides around a total 162 seedlings per species. Photosynthetically active radiation (PAR) was 34%, 62%, and 100% of full sunlight in thinned stands, shelterwoods, and clearcuts, respectively. Effects of overstory level and vegetation control on seedling growth and resource availability generally were additive. Seedling stem volume index in clearcuts averaged four to eight times that observed in thinned stands, and with vegetation control, it averaged two to four times that observed without it. In thinned stands, relative growth rate of seedling stem volume index had a positive linear relationship with PAR (R2 = 0.38). Foliar nitrogen content of Douglas-fir explained 71% of the variation in relative growth rate. Factors explaining the most variation in foliar nitrogen content differed between thinned stands (PAR, R2 = 0.34) and clearcuts or shelterwoods (midday water potential, R2 = 0.63), suggesting that light and root competition, respectively, were the primary growth-limiting factors for these overstory levels.

Foliar Nitrogen Content at Lifting Correlates with Early Growth of Loblolly Pine Seedlings from 20 Nurseries

1988 ◽  
Vol 12 (3) ◽  
pp. 181-185 ◽  
Author(s):  
Harry S. Larsen ◽  
David B. South ◽  
James N. Boyer
Keyword(s):  
Nitrogen Content ◽  
Loblolly Pine ◽  
Volume Growth ◽  
Field Performance ◽  
Height Growth ◽  
Growth Potential ◽  
Root Weight ◽  
Root Growth Potential ◽  
Foliar Nitrogen ◽  
Pine Seedlings

Abstract Height growth of outplanted loblolly pine seedlings was monitored over a 3-year period. Growth of seedlings from 20 nurseries was correlated with initial seedling characteristics from paired samples. Height growth during the first 6 months after planting was negatively correlated with the initial seedling height and shoot/root ratio and was positively correlated with root growth potential (RGP) and root weight. However, these variables were not significantly correlated with later growth. Foliar nitrogen content (mg of foliar nitrogen per seedling) was positively correlated with both initial and subsequent field growth. Foliar nitrogen content was the only variable that was significantly correlated with diameter growth and volume growth during the third year after planting. This variable accounted for 36% of the variation among sample means for 3-year height growth. These data support a previous report that field performance of loblolly pine seedlings during the first 3 years in the field can be influenced by the foliar nitrogen content at lifting. South. J. Appl. For. 12(3):181-185.

Spatial dynamics of radial growth and growth efficiency in residualPinus resinosafollowing aggregated retention harvesting

2009 ◽  
Vol 39 (1) ◽  
pp. 109-117 ◽  
Author(s):  
Matthew D. Powers ◽  
Christopher R. Webster ◽  
Kurt S. Pregitzer ◽  
Brian J. Palik
Keyword(s):  
Nitrogen Content ◽  
Radial Growth ◽  
Spatial Dynamics ◽  
Growth Efficiency ◽  
Moisture Stress ◽  
Foliar Nitrogen ◽  
Volume Increment ◽  
Aggregated Retention ◽  
Variable Retention Harvest ◽  
Residual Tree

Variable retention harvest systems are encouraged to promote complexity in managed forests, and aggregated retention has been suggested as a means of reducing moisture stress in residual trees. We studied the impacts of within-aggregate position on growth and foliar physiology to better understand the spatial dynamics of residual-tree responses to aggregated retention harvests in even-aged Pinus resinosa Ait. stands. Distance from edge and edge aspect influenced radial growth, volume increment, and growth efficiency, but only edge aspect affected foliar nitrogen content. Spatial variables had no significant relationships with foliar carbon isotope ratios (δ13C). Increases in radial growth, volume increment, and growth efficiency following harvesting were greatest near edges and in the northeastern quadrants of aggregates that received mechanical understory release treatments, and lowest in the southeastern quadrant of aggregates and near aggregate centers. Foliar nitrogen content was highest in the southwestern quadrants of aggregates that received understory release treatments, and lowest in the northwestern quadrants of aggregates. Our results suggest spatial relationships are important determinants of residual-tree responses to aggregated retention harvests.

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