Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 331 for “"Bark"”.
-
Nitrification in a pine bark medium
… grown in one-liter containers filled with pine bark, treated with and without a nitrification inhibitor and fertilized with 210 ml of a 100 ppm NH₄-N solution. Without the inhibitor and over time, “soil” solution NH₄-N concentrations and pH decreased and NO₃-N concentrations increased. “Soil” …
-
Biogeography and phylogenetics of Hawaiian bark lice
In a redefinition of the genus Ptycta (Psocidae), the history of the genera Ptycta Enderlein, 1925, and Copostigma Enderlein, 1903, is assessed. Previously defined as a monophyletic complex based on male genital morphology, Ptycta is redefined as those species of the Ptycta-Copostigma complex with …
-
Study of Neem bark tannins for the leather industry
Necin bark (1zadirach1a indica) contains a mixture of complex chemical components identified as: One procyanidin trirner Four dimers Cl Epicatechin-[4a-8j-epicatechin epicatechin. B1 Epicatechin- [4[3-8]-catechin, B2 Epicatechin- [43-8]-epicatechin, B3 Catechin-[4ct-81-catechin, B4 …
-
Absorption of nitrogen from a liquid by pine bark
… the potential of Pinus radiata (pine) bark to absorb organic and ammoniacal-nitrogen, from an aqueous solution and from a dairy slurry, in the laboratory and in a field treatment of dairy slurry. Preliminary experiments indicated that the initial nitrogen concentration of the solution …
-
Community Organization of Bark-Foraging Birds in Central Illinois
Made available in DSpace on 2015-05-14T15:10:30Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7715037.PDF: 4183579 bytes, checksum: d3d80511ddbd79a3704787297a4d1f13 (MD5) Previous issue date: 1977
-
Modeling Endemic Bark Beetle Populations in Southwestern Ponderosa Pine Forests
Bark beetle populations phase between epidemic, outbreak levels, and low population density, endemic levels. The majority of scientific research is focused on outbreak populations because of the associated economic, ecological, and social impacts. Endemic populations are rarely studied but could …
-
Vascular flora of Bark Camp Barrens WMA, Coffee County, Tennessee
A vascular plant inventory of Bark Camp Barrens Wildlife Management Area, Coffee County, Tennessee was performed over the 2023 and 2024 growing seasons. The site is a 1,395-ha area located 10km east of Manchester, Tennessee in the Barrens region of the Eastern Highland Rim. A total of 698 species …
-
Hymenopterous parasites of lps spp. bark beetles (Coleoptera:Scolytidae) in Virginia
The pine engraver beetles (~ spp.:Coleoptera:Scolytidae) may be serious pests depending on certain prerequisite conditions. In their secondary or "normal" role they breed in slash and damaged, dying, and dead trees. The broods emerging from these sources normally attack similar material. When such …
-
Suction Cup Lysimeter Method for Extracting Pine Bark Substrate Solution
… (SCL) in extracting substrate solution from pine bark substrates. Lysimeter types tested were 4.8-cm diameter with a ½ or 1-bar air-entry value (AEV) and 2.2-cm diameter also with a ½ or 1-bar AEV. Sufficient volume could be obtained when a vacuum pressure of 30, 40 or 50 cb was applied to …
-
THE CHARACTERIZATION AND UTILIZATION OF BARK AS A FLORICULTURE GROWING MEDIUM
<p>The use of fresh, inprocessed bark as a component of a soil-less medium for selected pot grown floriculture crops was evaluated.</p><p>Blends of bark of northern hardwood and softwood tree species from two New Hampshire sources were physically and chemically characterized. Measurements included …
-
Effects of host stored resources on bark beetle-fungal-conifer interactions
<p>Bark beetles and their associated fungi are among the greatest natural threats to conifers worldwide, but the degree to which host stored resources influence tree-beetle-fungal interactions has not been investigated. In western North America, the range of the mountain pine beetle (Dendroctonus …
-
Effects of host stored resources on bark beetle-fungal-conifer interactions
<p>Bark beetles and their associated fungi are among the greatest natural threats to conifers worldwide, but the degree to which host stored resources influence tree-beetle-fungal interactions has not been investigated. In western North America, the range of the mountain pine beetle (Dendroctonus …
-
Radiation of the bark louse genus Kilauella across the Hawaiian Islands
… from a systematics standpoint are limited. The bark louse genus Kilauella (Psocoptera: Elipsocidae) represents one of the most abundant genera of insects across all islands of the Hawaiian chain, and is a prime candidate for a phylogenetic study. This work aims to explore the diversification …
-
Storage Proteins in Apple Shoot Bark: Their Isolation, Characterization and Mobilization
Made available in DSpace on 2014-12-14T15:45:32Z (GMT). No. of bitstreams: 1 7726724.pdf: 2590401 bytes, checksum: 0bf17ba7c54ee0dee59b5d853481142e (MD5) Previous issue date: 1977
-
Characterizing the physical and hydraulic properties of pine bark soilless substrates
Soilless substrates, such as peat, pine bark, and coir, are widely used as growing media in containerized crops for their favorable characteristics, including low bulk density, balanced air exchange and water retention, disease resistance, and low pH and salinity. However, improper irrigation of …
-
Iron and manganese requirements of containerized plants growing in pine bark
… grown in one-liter containers filled with pine bark to determine Fe and Mn requirements with regard to rate and ratio. FeEDTA and MnEDTA were applied at either a 2:1 or 1:2 ratio of Fe:Mn at 5 concentrations each, 3 times per week with each irrigation. Medium solutions were collected every 21 …
-
Evolution of reproductive mode in the scaly-winged bark louse Echmepteryx hageni
… that is present in several species of bark lice (Insecta: Psocoptera), an inconspicuous and under-studied group of insects that scrape lichen and other organic matter off a substrate, often bark, dead branches, rock outcroppings, or leaf litter. It is in many ways the inverse of …
-
Phosphorus nutrition of Ilex crenata 'Helleri' grown in a pine bark medium
… nutrition of Ilex crenata 'Helleri' and pine bark P relationships. Branched liners of 'Helleri' holly were grown in a pine bark medium in which 0, 5, 10, 15, 20, 25, or 30 ppm P were maintained. Shoot dry weight increased as the pine bark P level increased to 10 ppm P, while root dry weight …
Page 1 of 17