Weed interference on maize (Zea mays) under no tillage system


Autoria(s): Salgado, T. P.; Pitelli, R. A.; Alves, PLCA
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

01/01/2005

Resumo

A field trial was carried out in Brazil in March 2002 with the aim to evaluate the effects of different timing and extension of weedy period on maize productivity. The hybrid Pioneer 30K75 was sowed under 7 t ha(-1) mulching promoted by glyphosate spraying. The treatments were divided in two groups: In the first group, weeds were maintained since the maize sowing until different periods in the crop cycle: 0, 14, 28, 42, 56, 70, and 150 days (harvesting time). In the second group, the maize crop was kept weed free for the same periods of the first group. Weed control was done through hand hoeing. A complete randomized blocks experimental design with five replications was used for plots distribution in the field. Nonlinear regression model was used to study the effects of weedy or weedfree periods on maize productivity. Weed community included 13 families and 31 species. Asteraceae, Poaceae, and Euphorbiaceae were the most abundant families. Results showed that under no tillage condition with 7 t ha-1 mulching at sowing time, the maize crop could cohabit with weed community for 54 days without any yield lost. on the other hand, if the crop was kept weed free for 27 days, the weed interference was not enable to reduce maize production. According to these results one weed control measure between 27 and 54 days after crop emergence could be enough to avoid any reduction in maize productivity.

Formato

181-184

Identificador

http://dx.doi.org/10.1081/PFC-200034307

Journal of Environmental Science and Health Part B-pesticides Food Contaminants and Agricultural Wastes. New York: Marcel Dekker Inc., v. 40, n. 1, p. 181-184, 2005.

0360-1234

http://hdl.handle.net/11449/947

10.1081/PFC-200034307

WOS:000226145900024

Idioma(s)

eng

Publicador

Marcel Dekker Inc

Relação

Journal of Environmental Science and Health - Part B: Pesticides, Food Contaminants, and Agricultural Wastes

Direitos

closedAccess

Palavras-Chave #Zea mays #competition #weed ecology
Tipo

info:eu-repo/semantics/article