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Asian Journal of Agricultural Research
  Year: 2011 | Volume: 5 | Issue: 6 | Page No.: 306-311
DOI: 10.3923/ajar.2011.306.311
 
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Management of Weeds of Rainfed Lowland Rice Using Cultivar Mixture Strategies

W.B. Binang, F. Ekeleme and J.D. Ntia

Abstract:
The aim of this field study conducted in Calabar, Southeastern Nigeria was to investigate whether mixtures of rice cultivars with different characteristics and in varying proportions and deployment times could be effective in suppressing weed growth. Two lowland rice cultivars; Faro 15 (improved, semi-dwarf, profuse tillering, lodge-tolerant, early maturing),and Muduga (local, tall, lodging-susceptible ,medium maturing), were raised in nurseries and 24 day old seedlings transplanted, 2 seedlings per hill at 20x20 cm spacing. Treatments were factorial combinations of 2 planting proportions (Faro 15: Muduga at 4:1 and 3:2) and 5 times of introduction (Faro 15 introduced 2 weeks before, 1 week before, same day as, 1 week after and 2 weeks after-Muduga). The results indicate that in rainfed, low-input, lowland rice production systems, cultivar mixtures can improve the competitive ability of rice, reducing weed biomass production and diminishing rice biomass losses. Across both cultivars, the population of weeds was reduced by 39.7% when Faro 15 was introduced 2 weeks after Muduga in a 3:2 ratio, but the effect on weed biomass was not significant. The time of component cultivar introduction significantly affected the weed suppressive ability of the mixture and the best time depended on the grain preference of the farmer. On the basis of combined grain yield, introducing Muduga 1 or 2 weeks after Faro 15 gave the best results.
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How to cite this article:

W.B. Binang, F. Ekeleme and J.D. Ntia , 2011. Management of Weeds of Rainfed Lowland Rice Using Cultivar Mixture Strategies. Asian Journal of Agricultural Research, 5: 306-311.

DOI: 10.3923/ajar.2011.306.311

URL: https://scialert.net/abstract/?doi=ajar.2011.306.311

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