共查询到20条相似文献,搜索用时 15 毫秒
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H. W. Frickhinger 《Forstwissenschaftliches Centralblatt》1934,56(17):593-594
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Dr. H. W. Frickhinger 《European Journal of Forest Research》1934,56(17):593-594
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The newly developed PEX procedure offers the possibility of a disinfestation of plant material by a pro-environmental and gentle method. The carbon dioxid used in the procedure has several advantages: it is physiologically unobjectionable, does not cost much and its availability is unlimited. The disinfestation takes place in a simple apparatus at pressures of 40 to 50 bar and treatment times of 10 to 20 minutes with following fast expansion. Neither insects nor their larvae or eggs resist this fatal treatment. 相似文献
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W. Mantel 《European Journal of Forest Research》1973,92(1):207-212
Summary Of a long series of forest taxation regulations, issued by Bavarian State Forest Administration, the first one, the socalled
“Special Instruction” of 1812, was given only small recognition by literature. This regulation was based on an approximative
method of periods by area and volume combined. It contained numerous apparently modern rules, however, any practical part
was missing. By reason of contemporary circumstances and the want of trained personel, its effects were very small.
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Oberforstmeister Weinkauff 《European Journal of Forest Research》1926,48(1):41-49
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