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Planta Daninha

Print version ISSN 0100-8358

Planta daninha vol.15 no.2 Viçosa  1997

http://dx.doi.org/10.1590/S0100-83581997000200007 

Aumento da população de plantas e uso de herbicidas no controle de plantas daninhas em milho

 

Increase of plant population and use of herbicides to control weeds in corn

 

 

Aldo Merotto JuniorI, Altamir F. GliidolinII, Milton L. de AlmeidaII, Hector S. HaverrothIII

IEng. Agrônomo. M. Sc. Professor Assistente da Faculdade de Agronomia da UFRGS. Porto Alegre (RS). Caixa Postal 776. CEP 90001-970
IIEng. Agrônomo. M. Sc. Professor da Faculdade de Agronomia da UDESC/CAV. Lages (SC). Caixa Postal 281. CEP 88502 970
IIIAcadêmico do Curso de Graduação em Agronomia. UDESC/CAV. Lages (SC)

 

 


RESUMO

O objetivo deste trabalho foi determinar a capacidade de controle de plantas daninhas efetuada pelo aumento da população de plantas de milho em associação com diferentes métodos de controle de plantas daninhas. O experimento foi conduzido em Lages (SC) sob o delineamento de blocos ao acaso em parcelas subdivididas. Nas parcelas principais foram alocados os métodos de controle de plantas daninhas: 1) sem controle; 2) atrazine + metolachlor (1,4 + 2,1 kg/h a) em pré emergência; 3) nicosulfuron (60 g/ ha) em pós - emergência; 4) atrazine + metolachlor em pré emergência e nicosulfuron em pós-emergência; e 5) capina até o florescimento. Nas sub parcelas foram alocadas as populações de plantas: 35.000, 50.000, 68.000 e 80.000 plantas ha-1. O aumento da população de plantas foi mais efetivo na diminuição da matéria seca de plantas daninhas nos tratamentos sem controle e com herbicida em pré emergência. As plantas daninhas promoveram maiores decréscimos no rendimento de grão s de milho na população de 80000 plantas ha-1, onde a competição com plantas daninhas somou-se à competição intraespecífica que também é maior do que nas menores populações . O uso de altas populações de plantas diminui a competição com plantas daninhas , mas deve ser complementado com outros métodos de controle no início do desenvolvimento da cultura.

Palavras chave: Competição, manejo integrado, planta daninha, herbicida, Zea mays.


ABSTRACT

The objective of this experiment was to evaluate the effectiveness of increasing corn plant population in association with differe nt methods to control weeds. The trial was conduted in Lages, SC, using a randomized complete block desing in a split plot arragement. Fiv e methods of weed control were located at the main plots: 1) check without control, 2) atrazine + metolachlor (1,4 + 2,1 kg/ha) in pre-emergency, 3) nicosulfuron (60 g/ha) in post emergency, 4) atrazine + metolachlor in pre-emergency and nicosulfuron in post emergency, and 5) hoeing up to flowerin g. Four plant population were tested at split plots: 35000, 50000, 68000 and 80000 plants ha-1. Incre asing plant population was more effective to decrease weed dry matter when no additional control was performed or herbicide was used in pre emergent. Weed influence on corn grain yield was greater at 80000 plantas ha-1 due to both weed and intraespecific competition. The use of high plant population can mitigate weed competition. However, it should be complemented with other methods of control during the early stages of corn development to achive high grain yields.

Key words: Competition, integrad weed managment, herbicide, Zea mays.


 

 

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Recebido para publicação em 15/07/97 e na forma revisada em 21/10/97.

 

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