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Open AccessArticle

Response of Barley Genotypes to Weed Interference in Australia

1
Queensland Alliance for Agriculture and Food Innovation (QAAFI), The University of Queensland, Gatton 4343, Australia
2
Department of Agronomy, Punjab Agricultural University, Ludhiana 141 004, India
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(1), 99; https://doi.org/10.3390/agronomy10010099
Received: 4 December 2019 / Revised: 3 January 2020 / Accepted: 6 January 2020 / Published: 9 January 2020
(This article belongs to the Special Issue Ecologically Sustainable Weed Management in Cropping Systems)
Weed-competitive genotypes could be an important tool in integrated weed management (IWM) practices. However, weed competitiveness is often not considered a priority for breeding high-yielding cultivars. Weed-competitive ability is often evaluated based on weed-suppressive ability (WSA) and weed-tolerance ability (WTA) parameters; however, there is little information on these aspects for barley genotypes in Australia. In this study, the effects of weed interference on eight barley genotypes were assessed. Two years of field experiments were performed in a split-plot design with three replications. Yield loss due to weed interference ranged from 43% to 78%. The weed yield amongst genotypes varied from 0.5 to 1.7 Mg ha−1. Relative yield loss due to weed interference was negatively correlated with WTA and WSA. A negative correlation was also found between WSA and weed seed production (r = −0.72). Similarly, a negative correlation was found between WTA and barley yield in the weedy environment (r = −0.91). The results suggest that a high tillering ability and plant height are desirable attributes for weed competitiveness in the barley genotypes. These results also demonstrated that among the eight barley genotypes, Commander exhibited superior WSA and WTA parameters and therefore, could be used in both low- and high-production systems for weed management. Westminster had a superior WSA parameter. Therefore, it could be used for weed management in organic production systems. These results also implied that genotypic ranking on the basis of WSA and WTA could be used as an important tool in strengthening IWM programs for barley. View Full-Text
Keywords: crop-weed competition; weed-suppressive ability; weed-tolerance ability; weed-competitive traits crop-weed competition; weed-suppressive ability; weed-tolerance ability; weed-competitive traits
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Mahajan, G.; Hickey, L.; Chauhan, B.S. Response of Barley Genotypes to Weed Interference in Australia. Agronomy 2020, 10, 99.

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