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Determination of the critical period of weed control in corn using a thermal basis. Repositório Alice
BEDMAR, F.; MANETTI, P.; MONTERUBBIANESI, G..
Field studies were conducted over 3 years in southeast Buenos Aires, Argentina, to determine the critical period fo weed control in maize (Zea mays L.). The treatment consisted of two different periods of weed interference, a critical weed-free period, and a critical time of weed removal. The Gompertz and logistic equations were fitted to relative yields representing the critical weed-free and the critical time of weed removal, respectively. Accumulated thermal units were used to describe each period of weed-free or weed removal. The critical weed-free period and the critical time of weed removal ranged from 222 to 416 and 128 to 261 accumulated thermal units respectively, to prevent yield losses of 2.5%. Weed biomass proved to be inverse t the crop yield...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Weed interference; Weed management; Accumulated thermal units; Nonlinear regression; Interferencia de plantas daninhas; Manejo de plantas daninhas; Unidades termicas acumuladas; Regressao nao-linear.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/88836
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Persistence of atrazine, metribuzin and simazine herbicides in two soils. Repositório Alice
FUSCALDO, F.; BEDMAR, F.; MONTERUBBIANESE, G..
An oat biossay was conducted in pots under greenhouse conditions to determine the persistence of atrazine, metribuzin and simazine herbicides in soils of the Southeast of Buenos Aires Province, Argentina. A trazine rates of 0, 0.58, 1.16 and 2.32 ug g-1 of active ingredient (a.i), metribuzin rates of 0, 0.14, 0.28 and 0.56 ug g-1 of a.i., and simazine rates of 0, 0.72, 1.45 and 2.9 ug g-1 of a.i. were applied to pots containing soils from Balcarce and San Cayetano sites. Organic matter (OM) content and pH of Balcarce soil were 5.5% and 5.8, while for san Cayetano soil were 2.9% and 6.7, respectively. Relative dry weight (RDW) of oat shoots was calculated as percentage of control. Considering a 20% RDW reduction of oat shoots, persistences of recommended...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Oat; Organic matter; PH; Herbicide rates; Biossay; Aveia; Materia organica; Doses de herbicidas; Bioensaio.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/101079
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