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Critical period for weed control in potatoes in the Huambo Province (Angola) Planta Daninha
Monteiro,A.; Henriques,I.; Moreira,I..
The effects of different weed management periods on potatoes were studied in three areas (Bailundo, Chianga and Calenga) of the central highlands of Angola and in three cropping seasons, from June 2005 to May 2007. Six weed-management treatments were used to identify critical periods of competition and to allow the development of more precise management recommendations. Total potato yield ranged from about 22 t ha-1 in weed-free plots to about 3 t ha-1 with no weed control a yield loss of 86%. Major weed species Galinsoga parviflora, Cyperus esculentus, Bidens biternata, Amaranthus hybridus, Nicandra physaloides, Portulaca oleracea and Datura stramonium differed from area to area. The species G. parviflora dominated the weed flora in all three areas 73, 97...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Solanum tuberosum; Tropical Africa; Yield loss.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000200013
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Hymenostegia viridiflora (Detarieae, Caesalpinioideae, Leguminosae), a new tree species from Cameroon Naturalis
Mackinder, B.A.; Wieringa, J.J..
A new species of Hymenostegia (Detarieae, Caesalpinioideae, Leguminosae) is described from Cameroon. Hymenostegia viridiflora has previously been confused with the type species of the genus, H. floribunda, but differs from it in having pale green to greenish yellow instead of lemon yellow petals, a broader upper part of the stipule, more numerous reddish veins on the white bracteoles and generally more numerous and narrower leaflets. As a consequence, the geographic range of true H. floribunda no longer includes Cameroon. Hymenostegia viridiflora is assessed as Vulnerable according to the criteria of IUCN.
Tipo: Article / Letter to the editor Palavras-chave: Caesalpiniaceae; Conservation; Fabaceae; Taxonomy; Threatened species; Tropical Africa.
Ano: 2013 URL: http://www.repository.naturalis.nl/record/524787
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