| Registro completo |
| Provedor de dados: |
PAB
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| País: |
Brazil
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| Título: |
Determination of the critical period of weed control in corn using a thermal basis
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| Autores: |
Bedmar,Francisco
Manetti,Pablo
Monterubbianesi,Gloria
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| Data: |
1999-02-01
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| Ano: |
1999
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| Palavras-chave: |
Weed interference
Weed management
Accumulated thermal units
Nonlinear regression
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| Resumo: |
Field studies were conducted over 3 years in southeast Buenos Aires, Argentina, to determine the critical period of weed control in maize (Zea mays L.). The treatments 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 to the crop yield for all the years studied. When weeds competed with the crop from emergence, a large increase in weed biomass was achieved 10 days after crop emergence. However, few weed seedlings emerged and prospered after the 5-6 leaf maize stage (10-20 days after emergence).
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000200006
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| Editor: |
Embrapa Secretaria de Pesquisa e Desenvolvimento
Pesquisa Agropecuária Brasileira
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| Relação: |
10.1590/S0100-204X1999000200006
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| Formato: |
text/html
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| Fonte: |
Pesquisa Agropecuária Brasileira v.34 n.2 1999
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| Direitos: |
info:eu-repo/semantics/openAccess
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