Influence of different weed control methods on weed biomass, growth and yield of mango ginger (Curcuma amada Roxb.) in forest savannah transition agro-ecological zone of Nigeria

Samuel Oluwaseun Osunleti, Patience Mojibade Olorunmaiye, Olusegun Rapheal Adeyemi, Temitope Opeyemi Osunleti

Abstract


Article Details: Received: 2021-06-06 | Accepted: 2021-07-18 | Available online: 2021-12-31 https://doi.org/10.15414/afz.2021.24.04.272-278

 

Field trials were conducted in the early cropping seasons of 2016 and 2017 at the Teaching and Research Farm of the Federal University of Agriculture Abeokuta (07° 20ʹ N, 3° 23ʹ E 159 m above sea level) in the forest – savannah transition agroecology of South-western Nigeria to evaluate the effect of weed control methods on weed biomass, growth and yield of mango ginger. Ten weed control methods were evaluated and laid out in a randomized complete block design with three replications. Data were collected on weed biomass, crop vigour score, stand count, number of rhizomes and rhizome yield. Results on weed biomass at 8 WAP showed that plots treated with different rates of pre-emergence herbicide gave lower weed biomass than hoe weeded plots. Also, at 24 WAP, plots treated with pre-emergence herbicide followed by different post emergence treatments gave lower weed biomass than plots when only pre-emergence herbicide was applied. In both years, plots hoe weeded five times at 4, 8, 12, 16 and 20 WAP gave the highest rhizome yield. Application of only pre-emergence herbicide throughout crop life cycle irrespective of the rate resulted in 60.7 to 62.0% reduction in rhizome yield relative to the maximum across the two years. Uncontrolled weed interference resulted in 91.9 and 92.1% rhizome yield reduction in 2016 and 2017, respectively. This study reveals that, mango ginger being a long-seasoned crop should be kept weed free beyond 12 WAP for acceptable yield.

Keywords: herbicide, hoe weeded, pre-emergence, rhizome yield, weed biomass

 

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