Strategy of evaluation of a collection of tropical herbaceous legumes from Brazil and Venezuela III. The use of ordination techniques in evaluation

Burt, R.L.; Williams, W. T.

doi:10.1016/0304-3746(79)90013-1

Cited by 13 publications

(3 citation statements)

References 12 publications

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“…A general account of the mathematical basis for the statistical procedures used in our analysis is given by Williams and Lance (1977). The volumetric water content at each of the seven applied matric potentials was entered as a simple numerical attribute into the TAXON programs MULCLAS , GROUPER (Lance et al 1968) and MINSPAN (Prim 1957;Burt and Williams 1979).…”

Section: Grouping Of Similar Moisture Characteristicsmentioning

confidence: 99%

“…3 the similarity between each of the soil moisture characteristics is depicted on the minimum spanning tree (Burt and Williams 1979) over which the group membership, as compiled by GROUPER, has been transposed. It is apparent that the groups defined by MULCLAS and GROUPER occupy well-defined zones within the tree.…”

Section: Soil Moisture Characteristic and Field Texturementioning

confidence: 99%

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The influence of texture, structure and clay mineralogy on the soil moisture characteristic

Williams¹,

Prebble²,

Williams³

et al. 1983

Soil Res.

190

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The relative importance of texture, structure, organic matter and clay mineralogy to the nature of the soil moisture characteristic is examined for an extensive group of Australian soils using numerical classification and diagnostic methods.The presence of pedality, particle size composition and grade of structure were the soil properties most consistently associated with differences between the groups of soils with similar moisture characteristics. By association, field texture was shown to be a useful property. Although the presence of pedality and grade of structure were important, the shape and size of ped had only weak associations with differences in the soil moisture retention.Montmorillonite, iron oxide, vermiculite and quartz were the minerals in the clay size fraction which appeared to be important if they were present. In contrast, the presence of illite did not show any strong associations with a particular position or form of the moisture characteristic.The soil moisture characteristic was successfully modelled as a power function. It appears that being able to group and classify the soil moisture characteristic and then to provide a description of these groups both in terms of soil properties and model parameters is a valuable means of developing simple predictive models for field soils. The error of our predictions for 44 horizons based on this simple approach appears to be only marginally larger than that encountered in conventional laboratory methods, and in view of soil heterogeneity it is argued that following further development these predictions may be adequate in many hydrological and agricultural applications.

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Section: Grouping Of Similar Moisture Characteristicsmentioning

confidence: 99%

Section: Soil Moisture Characteristic and Field Texturementioning

confidence: 99%

The influence of texture, structure and clay mineralogy on the soil moisture characteristic

Williams¹,

Prebble²,

Williams³

et al. 1983

Soil Res.

190

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show abstract

“…The attributes comprised 6 binaries, 26 numerics, 7 multistate nominals and 15 ordinals. Details of the attributes are not given here, but can be found in BURT & WILLIAMS (1979b).…”

Section: Plant Materialsmentioning

confidence: 99%

A method for establishing character inter-relations in plant collections, and its possible application to plant improvement programmes

Williams

Burt

Lance³

1980

Euphytica

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Genetic variation in agronomically important species of Stylosanthes determined using random amplified polymorphic DNA markers

Kazan

Manners

Cameron

1993

Theoret. Appl. Genetics

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Random amplified polymorphic DNA (RAPD) markers were generated from 20 cultivars and accessions representing four agronomically important species of Stylosanthes, S. scabra, S. hamata, S. guianensis, and S. humilis. Approximately 200 fragments generated by 22 primers of arbitrary sequence were used to assess the level of DNA variation. Relatively low levels of polymorphism (0-16% of total bands in pairwise comparisons) were found within each species, while polymorphisms between the species were much higher (up to 46%). Very few polymorphisms (0-2%) were detected between the individuals of the same cultivar or accession. A phenogram of relationships among the species was constructed based on band sharing. Four main clusters corresponding to each species were readily distinguished on this phenogram. The allotetraploid species S. hamata and its putative diploid progenitor, S. humilis, were more similar to each other than to S. scabra and S. guianensis. No variation in RAPD markers was found between the two commercial S. hamata cvs 'Verano' and 'Amiga'. Cultivar 'Oxley' in S. guianensis was considerably different from the other cultivars and accessions of this species. The phylogenetic distinctions obtained with RAPDs were in agreement with other studies from morphology, cytology, and enzyme electrophoresis. The low level of polymorphisms observed within each species suggested that interspecific crosses may be a better vehicle for the construction of RAPD linkage maps in Stylosanthes.

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Strategy of evaluation of a collection of tropical herbaceous legumes from Brazil and Venezuela III. The use of ordination techniques in evaluation

Cited by 13 publications

References 12 publications

The influence of texture, structure and clay mineralogy on the soil moisture characteristic

The influence of texture, structure and clay mineralogy on the soil moisture characteristic

A method for establishing character inter-relations in plant collections, and its possible application to plant improvement programmes

Genetic variation in agronomically important species of Stylosanthes determined using random amplified polymorphic DNA markers

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