A Competitive Ratio for Quantifying Competition Between Intercrops

Willey, R. W.; Rao, M. R.

doi:10.1017/s0014479700010802

Cited by 381 publications

(300 citation statements)

References 4 publications

(4 reference statements)

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“…The competitive ratio (CR) was used to evaluate which one crop competes with the other in an intercropping system (Willey & Rao 1980;Wahla et al 2009), and can be calculated by following the formula (Bhatti et al 2006):…”

Section: Competitive Ratiomentioning

confidence: 99%

“…Safflower dominated and occupied a superior ecological niche in the intercropping system. The competitive ratio (CR) is considered a better measure of competitive ability of the crops compared with the RCC and aggressivity (Willey & Rao 1980;Wahla et al 2009). Higher bitter vetch CR values in our study indicated that in different intercropping patterns, safflower was more competitive than bitter vetch.…”

Section: Relative Crowding Coefficient (Rcc)mentioning

confidence: 99%

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Intercropping patterns and different farming systems affect the yield and yield components of safflower and bitter vetch

Jalilian

Najafabadi

Zardashti

2017

Journal of Plant Interactions

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This factorial field experiment was done based on a randomized complete block design in Urmia University, Iran, in 2013 and was repeated in 2014. Treatments included two farming systems (high input and organic) and different intercropping patterns that alternated bitter vetch (Vicia ervilia L.) and safflower (Carthamus tinctorius L.) with row ratios of 2:2, 3:2, 4:2 and 5:2. Sole cropping of bitter vetch and safflower was used as the control. In both years, the 2:2 intercropping pattern had biomass yield advantages compared to sole cropping and the other intercropping ratios, based on greater land equivalent ratio values. Safflower had higher relative crowding coefficients, competitive ratio (CR) and aggressivity (A) values than bitter vetch. High-input farming was more effective than the organic system in both years. Safflower was the superior competitor when grown with bitter vetch, and its productivity dominated the total biomass yields. Thus, intercropping of safflower with bitter vetch has the potential to improve performance with high land-use efficiency.ARTICLE HISTORY

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Section: Competitive Ratiomentioning

confidence: 99%

Section: Relative Crowding Coefficient (Rcc)mentioning

confidence: 99%

Intercropping patterns and different farming systems affect the yield and yield components of safflower and bitter vetch

Jalilian

Najafabadi

Zardashti

2017

Journal of Plant Interactions

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“…the yield that could be expected with no interaction, when a linear increase with mixture proportion is assumed (cf. Willey and Rao 1980;Jolliffe et al 1984; stippled lines in replacement series graphs of Fig. 2).…”

Section: Methodsmentioning

confidence: 99%

Competitive ranks of three Fucus spp. (Phaeophyta) in laboratory experiments?testing of Keddy's competitive hierarchy model

Karez

2003

Helgoland Marine Research

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Keddy's competitive hierarchy model describes species distribution patterns along gradients under equilibrium conditions and can potentially serve as an explanation for zonation patterns of intertidal seaweeds on rocky shores. One of the assumptions of the model is a competitive hierarchy with the top competitor occupying the benign end of the gradient. Another assumption is the consistency of competitive ranks of species in all environmental conditions included in the shared parts of species' fundamental niches. In laboratory replacement series experiments, the competitive ranks of pairs of Fucus species that occupy adjacent zones in the field were analysed and compared to ranks found in previous field experiments. Unattached thalli of Fucus serratus versus F. vesiculosus or F. vesiculosus versus F. spiralis, respectively, were held in aerated beakers to establish the competitive ranking of the three congeners. Each replacement series was conducted at three total densities. F. vesiculosus was clearly competitively dominant over F. serratus. In competition with F. spiralis, F. vesiculosus was only dominant at its lowest absolute input frequencies, but at higher frequencies dominance was reversed. At high densities, the total ranking was F. spiralis > F. vesiculosus > F. serratus, which is the opposite order to that which would be expected from Keddy's model. Although all three species thrived well under the laboratory conditions, the results did not reflect in situ competitive dominances, which may be an effect of nutrient competition in the laboratory. Keddy's assumption that competitive ranks are consistent over the whole range of fundamental niches cannot be supported for Fucus spp.

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“…It was determined according to Willey and Rao (1980) The statistical analysis for data was carried out according to Gomez and Gomez (1984). L.S.D test at 5% significant level was used to compare the differences between treatment means.…”

Section: -Competitive Ratio (Cr)mentioning

confidence: 99%

Effect of Plant Density and intercropping Pattern on yield and Competitive Relationships of Maize and Cowpea

2016

Alexandria Science Exchange Journal: An International Quarterly

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A Competitive Ratio for Quantifying Competition Between Intercrops

Cited by 381 publications

References 4 publications

Intercropping patterns and different farming systems affect the yield and yield components of safflower and bitter vetch

Intercropping patterns and different farming systems affect the yield and yield components of safflower and bitter vetch

Competitive ranks of three Fucus spp. (Phaeophyta) in laboratory experiments?testing of Keddy's competitive hierarchy model

Effect of Plant Density and intercropping Pattern on yield and Competitive Relationships of Maize and Cowpea

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