Competition in Mixtures of Herbage Grasses

England, F.

doi:10.2307/2401287

Cited by 33 publications

(19 citation statements)

References 8 publications

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“…Tendency of mixture yields towards the higher component was reported by ENGLAND (1968) and the WR/ W c graphs of five species of Hordeum (NoRRINQTON-DAvlES, 1967) as well as those in the present work, especially in October, indicated the same. In contrast, the reanalysis of the weed data of WILLIAMS (I962) by NORRINGTON-DAvIES (I967) showed a tendency towards the smaller species.…”

Section: Discussionsupporting

confidence: 86%

“…"Dominance" relationships may be of interest also in wide mixtures but if--as in the WR/V k "genetic dominance" graphs of HARPER (1963) --no separation is made in the competing units, the interpretation of anything less than "overdominance" may be impossible and should be restricted to effects of major environmental changes such as the density effects of HARPF. R (1963) andENGLAND (1968). The change between August and October in the present work may belong to this category.…”

Section: Discussionmentioning

confidence: 57%

“…Statistical analyses were made by the diallel method of EBERHART et al (1964) and by the quasi-split-plot method of Sampford (quoted by ENGLAND, 1968 ). Graphical methods of HARPER (1963) and DURRANT (1965) were also applied.…”

Section: Designated Hmentioning

confidence: 99%

“…The only known application of the diallel technique to different forage species is by ENGLAND (1968) in two grass species grown in boxes. It would be interesting to get information on more varied material in the field.…”

Section: Introductionmentioning

confidence: 99%

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Diallel tests of competition in establishing forage stands

Fejer¹

1971

Plant Ecol

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 57%

Section: Designated Hmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diallel tests of competition in establishing forage stands

Fejer¹

1971

Plant Ecol

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“…England 1968;Thomson 1969). Norrington-Davies 1968;England 1968;Whittington & O'Brien 1968;Thomson 1969;Rhodes 1970). Norrington-Davies 1968;England 1968;Whittington & O'Brien 1968;Thomson 1969;Rhodes 1970).…”

Section: Mixture Productivitymentioning

confidence: 99%

Competitive Interactions between Populations of Poa pratensis and Agrostis tenuis from Ecologically-Contrasting Environments

Helgadóttir¹,

Snaydon²

1985

The Journal of Applied Ecology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. This content downloaded from 128.226.37.5 on Tue SUMMARY(1) Populations of Poa pratensis and Agrostis tennis were collected from high fertility and low fertility plots of long-term fertilizer experiments at Rothamsted (England) and Samsstadir (Iceland).(2) The populations were grown in the field, in pure stands and in all possible two-species mixtures at Reading (England) and Korpa (Iceland) for 2 years. Two levels of nitrogen fertilizer (25 and 200 kg N ha-' year-') were applied.(3) Agrostis tennis was the more competitive at Reading, whereas P. pratensis was the more competitive at Korpa. N fertilizer increased the competitive ability of P. pratensis, relative to A. tennis, at both locations.(4) In pure stands, populations generally performed best in their native country, but populations rarely differed in response to fertilizer. In mixtures, populations of contrasting climatic origin were more competitive in their native country. Populations from soils of contrasting fertility were also more competitive at N inputs similar to those of their native site.(5) The yield advantage of mixtures, as measured by the relative yield total (RYT), was greater when populations were grown in fertility conditions resembling those of their native habitat.

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Population Variability in Danthonia Caespitosa (Gramineae) in Responses to Increasing Density Under Three Temperature Regimes

Quinn

Hodgkinson

1983

American J of Botany

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The objective of this research was to compare the responses to increasing density of different natural populations of Danthonia caespitosa, a perennial grass of southern Australia, under different temperature regimes. Seeds were collected from four populations along a 167‐km N–S transect beginning north of Deniliquin, N.S.W., and ending near Heathcote, Victoria. Seedlings from each population were planted in loamy sand at three densities and grown under day/night temperature regimes of 15/10, 24/19, and 33/28 C in the Canberra Ceres Phytotron. Results indicate that one natural population (or one temperature regime) can not be used to characterize this species' responses to increasing density. The effects of density and temperature on tillering, plant height, leaf length, and leaf width varied significantly among populations, so that populations achieved comparable shoot weights by different relative responses to density. Variability in biomass among individuals (as indicated by coefficients of variation) increased from low to intermediate density; however, size variability at the highest density was either greater, lesser, or approximately the same as that of plants at the intermediate density, depending upon the population and the temperature regime. The combinations of density and temperature which produced the maximum shoot growth per pot varied markedly among populations; at 24/19 C, populations from frequently disturbed areas of low perennial plant cover had greater shoot weights per pot at the intermediate density, while those populations from more stable grassland sites had their greatest shoot weights at the highest density. Flowering occurred in all populations at the low density in 15/10 C; however, only for the population from the ungrazed grassland was there any flowering in the other temperature regimes or at higher densities. It is concluded that a “response to density stress” could be differentially described for each population at each temperature regime, even though the four study populations represented only 1/10 of the latitudinal range of D. caespitosa.

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Competition in Mixtures of Herbage Grasses

Cited by 33 publications

References 8 publications

Diallel tests of competition in establishing forage stands

Diallel tests of competition in establishing forage stands

Competitive Interactions between Populations of Poa pratensis and Agrostis tenuis from Ecologically-Contrasting Environments

Population Variability in Danthonia Caespitosa (Gramineae) in Responses to Increasing Density Under Three Temperature Regimes

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