Results 81 to 90 of about 12,065 (219)
Plant Remains from an Early Iron Age Well at Hajndl, Slovenia [PDF]
, 2009 The archaeobotanical samples analysed derive from a well-preserved well dated to the Early Iron Age (Hallstatt) according to pottery found in the sampled layers and on a radiocarbon dating (720–520 cal B.C.) of the wooden construction of the well ...
Antun Alegro +4 more
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Comparative chromatography of chloroplast pigment [PDF]
, 1969 Methods for isolation of low concentration pigments of the cocklebur species are described. The methods entail two step chromatography so that the different sorption properties of the various pigments in varying column parameters can be utilized ...
Grandolfo, M., Sherma, J., Strain, H. H.
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Chromosome Numbers in Certain Species of Helianthus [PDF]
, 1931 The genus Helianthus is a comparatively large one, containing, according to Watson (13), 108 authentic and several doubtful species. These are arranged and classified by the taxonomist according to manifestations that are readily visible, but, if the ...
Geisler, Florence
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Invasive species in protected areas of Croatia [PDF]
, 2018 Invazivne vrste su agresivne i brzo se rašire staništem. Na takvim staništima broj autohtonih vrsta se smanjuje zato što im invazivne vrste uzimaju prostor i hranu, a nekima su predatori. To dovodi do smanjenja biološke raznolikosti koja je uvelike važna
Mandić, Antonela
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Growth of Xanthium (Compositae) internodes at different positions on the stem
Acta Societatis Botanicorum Poloniae, 2014 Internode growth of vegetative Xanthium plants was studied at various levels on the stem with application of the plastochron index. The bottom internodes were of small size and they displayed small rates of growth.
Joseph A.J. Orkwiszewski +1 more
doaj +1 more source
Efficacy of Soybean Herbicides on Annual Morninglory [PDF]
, 2001 Field experiments were established in 2000 and 2001 at the Agricultural Research and Education Complex in Bowling Green, Kentucky to evaluate herbicide efficacy on annual morningglory (Ipomoea spp.) species and other weeds.
Oveson, Dawn
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Aktuelle Nachweise von höheren Pflanzen in der Umgebung von Halle (Saale) [PDF]
, 2012 Dieser Beitrag setzt die von JOHN & STOLLE (2007) veröffentlichten Nachweise höherer Pflanzen in der Umgebung von Halle (Saale ...
John, Heino
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Interrelationship of nitrogen and photo-period on the flowering, growth, and stem anatomy of certain long day and short day plants [PDF]
, 1945 The relation of nitrogen to the flowering and fruitfulness of plants has been subject of extended investigation by many workers. That nitrogen nutrition is intimately related to flower and fruit formation is generally agreed upon, but the various ...
Withrow, Alice Phillips
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Survey and Annotated Checklist of the Later Summer Flora of the Moist Soil Units at Holla Bend National Wildlife Refuge [PDF]
, 1991 We conducted a floristic survey of 22 moist soil units at Holla Bend National Wildlife Refuge during September and October of 1990. The moist soil units range in size from 0.4 to 9.7 ha and are depressions manipulated to provide food and shelter for ...
Johnson, George P., Walker, Stephen A.
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Industrial Crops and ProductsInvasive plants pose a substantial threat to agricultural production, and their control elevates the costs associated with the application of synthetic chemical herbicides.
Zhixiang Liu +7 more
doaj +1 more source