@article{10.11648/j.ajbio.20221003.11,
  author = {Ano Wariyo and Habtamu Gudisa Megersa and Negesu Guteta and Dadi Tolessa Lemma},
  title = {Determination of Critical Period of Weed Competition in Vernonia (Vernonia galamensis Cass. Less) at Wondo Genet, Southern Ethiopia},
  journal = {American Journal of BioScience},
  volume = {10},
  number = {3},
  pages = {94-100},
  doi = {10.11648/j.ajbio.20221003.11},
  url = {https://doi.org/10.11648/j.ajbio.20221003.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajbio.20221003.11},
  abstract = {Vernonia is a new industrial biofuel crop, which is potentially grown for its seed oil. However, its production has been greatly challenged by diverse constraints like abiotic and biotic (Diseases, insect pests, and weed) factors. The weed effect is one of the important limiting factors for crop growth and productivity in agricultural crop production. But there is little information on the type of weed affecting the crop and the critical time of weed competition for the production of Vernonia galamensis. Hence, this study was conducted at Wondo Genet to determine the critical weed competition period for growth, yield, and yield components of the vernonia plant. The experiment was laid out by RCBD with fourteen treatments of weeding regimes in three replications. The data on the growth, yield components, and yield parameters of vernonia were collected, analyzed, and discussed accordingly. The weed competition duration had a significant influence on the plant height, the number of primary branches per plant, thousand seed weights, seed yield weight per plant, and seed yield weight per hectare. Hence, the highest seed yield was obtained from the weed-free check (2.84 t ha-1), weed-free for 90 (2.66 t ha-1) and 75 (2.63 t ha-1) whereas the lowest was from the weedy-check (0.88 t ha-1). The yield loss of Vernonia galamensis was estimated based on seed yield weight per hectare. Thus, the highest yield loss of seed yield was recorded in the weedy check (69.22%) whereas the lowest was in the weed-free check (0.00%), respectively. To determine the beginning and the end of the critical period of crop-weed competition at 5% and 10% acceptable yield loss levels were used. Therefore, to reduce the yield losses by more than 10% and to obtain a higher economic return, weeds must be kept free within WF75 to WF90 to reduce the risk of economic yield losses as it has been found to be the critical period.},
 year = {2022}
}

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TY  - JOUR
T1  - Determination of Critical Period of Weed Competition in Vernonia (Vernonia galamensis Cass. Less) at Wondo Genet, Southern Ethiopia
AU  - Ano Wariyo
AU  - Habtamu Gudisa Megersa
AU  - Negesu Guteta
AU  - Dadi Tolessa Lemma
Y1  - 2022/06/08
PY  - 2022
N1  - https://doi.org/10.11648/j.ajbio.20221003.11
DO  - 10.11648/j.ajbio.20221003.11
T2  - American Journal of BioScience
JF  - American Journal of BioScience
JO  - American Journal of BioScience
SP  - 94
EP  - 100
PB  - Science Publishing Group
SN  - 2330-0167
UR  - https://doi.org/10.11648/j.ajbio.20221003.11
AB  - Vernonia is a new industrial biofuel crop, which is potentially grown for its seed oil. However, its production has been greatly challenged by diverse constraints like abiotic and biotic (Diseases, insect pests, and weed) factors. The weed effect is one of the important limiting factors for crop growth and productivity in agricultural crop production. But there is little information on the type of weed affecting the crop and the critical time of weed competition for the production of Vernonia galamensis. Hence, this study was conducted at Wondo Genet to determine the critical weed competition period for growth, yield, and yield components of the vernonia plant. The experiment was laid out by RCBD with fourteen treatments of weeding regimes in three replications. The data on the growth, yield components, and yield parameters of vernonia were collected, analyzed, and discussed accordingly. The weed competition duration had a significant influence on the plant height, the number of primary branches per plant, thousand seed weights, seed yield weight per plant, and seed yield weight per hectare. Hence, the highest seed yield was obtained from the weed-free check (2.84 t ha-1), weed-free for 90 (2.66 t ha-1) and 75 (2.63 t ha-1) whereas the lowest was from the weedy-check (0.88 t ha-1). The yield loss of Vernonia galamensis was estimated based on seed yield weight per hectare. Thus, the highest yield loss of seed yield was recorded in the weedy check (69.22%) whereas the lowest was in the weed-free check (0.00%), respectively. To determine the beginning and the end of the critical period of crop-weed competition at 5% and 10% acceptable yield loss levels were used. Therefore, to reduce the yield losses by more than 10% and to obtain a higher economic return, weeds must be kept free within WF75 to WF90 to reduce the risk of economic yield losses as it has been found to be the critical period.
VL  - 10
IS  - 3
ER  - 

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