Competition between Six Spring Barley (<i>Hordeum vulgare</i>ssp.<i>vulgare</i>L.) Cultivars and Two Weed Flora in Relation to Interception of Photosynthetic Active Radiation

Didon, U. M. E.; Hansson, Margareta L.

doi:10.1080/01448765.2002.9754969

Cited by 23 publications

(22 citation statements)

References 15 publications

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“…Hoad et al (2006b) suggest that a balance between different characteristics for weed suppression will determine the value of the variety for early, late and season-long weed control. Early crop vigour Acciaresi et al 2001;Bertholdsson 2005), early season crop ground cover (Cousens et al 2003;Lemerle et al 1996, Huel andHucl 1996) and plant height (Gooding et al 1993;Didon and Hansson 2002) are widely reported as important traits or characteristics for increasing crop competitiveness. However, seasonal variations in cultivar performance and individual cultivar responses in traits such as tiller production and/or tiller retention can make it difficult to group varieties in field trials into consistently good or poor ideotypes (Hoad et al 2006a, b).…”

Section: Discussionmentioning

confidence: 98%

Selection of cereals for weed suppression in organic agriculture: a method based on cultivar sensitivity to weed growth

Hoad

Topp

Davies³

2008

Euphytica

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Cereal cultivars conferring a high degree of crop competitive ability, especially against aggressive weeds, are highly beneficial in organic farming as well as other farming systems that aim to limit the use of herbicides. In this study, thirteen winter wheat cultivars, plus one spring wheat and one winter oat were assessed for their competitive ability at key growth stages, across three seasons. The natural population of weed species was allowed develop without agronomic intervention. Weed suppression ability for each cultivar (S var ) was calculated as the difference between weed growth in plots for each cultivar and the maximal weed growth (W max ) from adjacent uncropped areas. The sensitivity of S var in response to changes in weed growth (S var W ) was derived from the linear regression coefficient of S var plotted against W max . There was significant variation in S var between cultivars and strong evidence for cultivars to vary in S var W . Amongst groups of cultivars with similar levels of S var some could be defined as being of higher or lower sensitivity to changes in weed growth. Some cultivars also had relatively good S var at high levels of weed growth. The use of both weed suppression ability and sensitivity across different levels of weed growth or weed populations has considerable potential for selecting new cultivars suitable for organic agriculture. Ideally new cultivars will be selected on the basis of high S var and/or low S var W . This analysis provides the means to measure sensitivity of cultivar performance across a range of favourable and unfavourable conditions.

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Section: Discussionmentioning

confidence: 98%

Selection of cereals for weed suppression in organic agriculture: a method based on cultivar sensitivity to weed growth

Hoad

Topp

Davies³

2008

Euphytica

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“…, 1986; Christensen, 1995). In a study of six spring barley varieties grown under organic conditions, Didon and Hansson (2002) found that the most competitive varieties transmitted the least photosynthetically active radiation through the canopy during tillering and elongation and had high numbers of internodes. Didon (2002) showed that competitive varieties had an early stem elongation and that the length of the two first internodes, as well as the length of the main shoot, were important morphological traits.…”

Section: Introductionmentioning

confidence: 99%

A weed suppressive index for spring barley (Hordeum vulgare) varieties

2008

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Summary A screening programme for crop variety competitiveness would ideally be based on only a few, non‐destructive measurements of key growth traits. In this study we measured the weed suppressive ability of 79 varieties of spring barley in two ways: (i) directly, by weed coverage assessments under weedy conditions at three Danish locations in 2002–2004 and (ii) indirectly, by non‐destructive measurements of varietal growth traits under weed‐free conditions in 17 other experiments in Denmark in 2001–2003. Based on just four varietal growth traits (reflectance, leaf area index, leaf angle and culm length), we successfully developed a method for indexing the weed suppressive ability of spring barley varieties. The suppressive index ranged from 12% in Lux and 55% in Modena in proportion to the 90% quantile coverage of all varieties. The index was validated against independent data from two locations in 2005 with 14 and 24 varieties and was found valuable for future use in regular screening programmes.

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“…, 2001), plant height (Gooding et al. , 1993), tillering capacity, seed size, initial shoot and root growth rates (Christensen, 1995; Froud‐Williams, 1997; Qingwu & Stougaard, 2002; Didon, 2002a,b). Allelopathy is receiving increasing attention (e.g.…”

Section: Introductionmentioning

confidence: 99%

Early vigour and allelopathy – two useful traits for enhanced barley and wheat competitiveness against weeds

2005

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Summary The objectives of this study were to identify traits in spring barley (Hordeum vulgare) and spring wheat (Triticum aestivum) related to the competitive ability of the crop and to determine their importance. Weed biomass 1–2 weeks prior to ear emergence was used as a measure of genotypic differences in competitiveness against weeds. Crop trait measurements comprised early crop biomass, early shoot height, straw length, heading and maturity. Early crop biomass 1–2 weeks prior to ear emergence was used as an overall trait for the various characters related to early vigour. In addition to these morphological traits, the potential allelopathic activity of the tested cultivars was determined using an agar‐based bioassay with Lolium perenne (ryegrass). In both barley and wheat, multiple regression analysis revealed that early crop biomass and potential allelopathic activity were the only parameters that significantly contributed to competitiveness. In barley, early crop biomass explained 24–57% of the observed genotypic variance across 4 years, allelopathic activity explained 7–58% and combined they explained 44–69% of the observed genotypic variance. In wheat, the corresponding figures were lower: 14–21% for early biomass, 0–21% for allelopathic activity and 27–37% when combined. Model predictions suggested that new cultivars with increased early vigour and allelopathic activity offer a potential to further reduce weed interference.

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Competition between Six Spring Barley (Hordeum vulgaressp.vulgareL.) Cultivars and Two Weed Flora in Relation to Interception of Photosynthetic Active Radiation

Cited by 23 publications

References 15 publications

Selection of cereals for weed suppression in organic agriculture: a method based on cultivar sensitivity to weed growth

Selection of cereals for weed suppression in organic agriculture: a method based on cultivar sensitivity to weed growth

A weed suppressive index for spring barley (Hordeum vulgare) varieties

Early vigour and allelopathy – two useful traits for enhanced barley and wheat competitiveness against weeds

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