Reduced dosages of atrazine and narrow rows can provide adequate weed control in smallholder irrigated maize (Zea mays L.) production in South Africa

An on-farm experiment was conducted in Zanyokwe irrigation scheme to investigate the effects of row spacing (45 and 90 cm) and atrazine dosage (33, 67 and 100% of the label recommended dosage) on weed density and biomass and on maize yield. Overall percent kill of weeds increased with increase in at...

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Bibliographic Details
Published in:African journal of biotechnology 2010-11, Vol.9 (45), p.7660-7666
Main Authors: Fanadzo, M, Chiduza, C, Mnkeni, PNS
Format: Article
Language:English
Subjects:
Bidens pilosa
Cynodon dactylon
Cyperus esculentus
Digitaria sanguinalis
Nicandra
Oxalis latifolia
Zea mays
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Summary:An on-farm experiment was conducted in Zanyokwe irrigation scheme to investigate the effects of row spacing (45 and 90 cm) and atrazine dosage (33, 67 and 100% of the label recommended dosage) on weed density and biomass and on maize yield. Overall percent kill of weeds increased with increase in atrazine dosage and with reduction in row spacing. Percent kill varied according to weed species with a 100% kill of broad leaf weeds such as Amamnthus hybridus, Nicandra physaloides and Bidens pilosa regardless of herbicide dosage while Digitaria sanguinalis, Cyperus esculentus, Cynodon dactylon and Oxalis latifolia could not be controlled even at the LRD. Weed density at maize physiological maturity decreased by 11% when row spacing was decreased from 90 to 45 cm. Atrazine dosage and row spacing did not have significant interactive effects and their main effects did not significantly affect weight of green cobs, cob length or grain yield. The study demonstrated the possibility of incorporation of reduced herbicide dosages and narrow rows to achieve adequate weed control and optimise on yields in smallholder farming systems.
ISSN:1684-5315
1684-5315