Período crítico de competição entre ervas daninhas e a cultura do feijão (Phaseolus vulgaris L)
Palavras-chave:
feijoeiro competicao, ervas daninhas, cultura feijão, capina subsequentes, produção sementesResumo
In order to determine the critical period of competition between weeds and field beans, three experiments were carried out at Viçosa, State of Minas Gerais, two during the "rainy" seasonand one during the "dry" season. The treatments included: three variable periods of competition after the emergence ofthe beans, followed by the elimination of the weeds; four periods of the inverse sequence; and one always free of weeds.
One can conclude that maximum yield can be obtained when the bean crop is kept free of weeds for a 30 day period after emergence. The critical period occurs 10-30 days after emergence. When weeds are present during this period, yields may decrease as much as 50-70%.
Referências
AGUNDIS M. , O,A, VALTIERRA & B, CASTILLO, Periodos criticos de competencia entre frijol y mazelas. Agric. Tec. en México 2(2): 87-90. 1962-63.
BLANCO, H.G,, D. A, OLIVEIRA & J, B. M. ARAÚJO, Com- petição de plantas daninhas com a cultura do feijoeiro (Phaseolus vulgaris). O Biológico 35(12): 304-308, 1969.
INFORZATO,R, & S. MIYASAKA, Sistema radicular do feijoeiro em dois tipos de solo do Estado de São Paulo. Bragantia 22(38): 477-481. 1963.
NIETO, J.H., M, A, BRONDO & J, T, GONZALEZ, Critical periods of the crop growth cycle for competition from weeds. Pest Articles and News Summ., Sect. C, 14(2): 159-166. 1968.
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