A comparison of growth rates and phosphorus distribution in a range of pasture species

E. F. Biddiscombe, P. G. Ozanne, N. J. Barrow

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Relative growth rates (RGR) of nine annual pasture species and lucerne were compared in two experiments. During the first 4 weeks of growth the RGR of the clovers tended to be slower than that of the herbs and grasses, especially at low levels of applied phosphate. This situation was reversed towards maturity. Slow RGR of the tops of the clovers at low phosphorus levels was associated with the development of large root systems relative to tops; but at least in subterranean clover, the RGR of the roots was also slow. Other associated characteristics of the clovers, a month from emergence and at low phosphorus levels, were low phosphorus concentrations in the tops relative to nonlegumes, and a low proportion of their total phosphorus in the tops. The phosphorus content per unit weight of clover roots was low under these conditions. Differences between species in early growth rate were maintained on different soils, even though the soil solution contained widely different concentrations of phosphate. Establishment of species in the field, particularly during the seedling stage, is discussed in relation to growth rates at low and optimal levels of phosphorus.

Original languageEnglish
Pages (from-to)1023-1033
Number of pages11
JournalAustralian Journal of Agricultural Research
Volume20
Issue number6
DOIs
Publication statusPublished - 1 Jan 1969
Externally publishedYes

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Phosphorus
Medicago
pastures
phosphorus
Growth
phosphates
Soil
Phosphates
Trifolium subterraneum
Medicago sativa
soil solution
root systems
Poaceae
herbs
alfalfa
Seedlings
grasses
seedlings
Weights and Measures
soil

Cite this

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abstract = "Relative growth rates (RGR) of nine annual pasture species and lucerne were compared in two experiments. During the first 4 weeks of growth the RGR of the clovers tended to be slower than that of the herbs and grasses, especially at low levels of applied phosphate. This situation was reversed towards maturity. Slow RGR of the tops of the clovers at low phosphorus levels was associated with the development of large root systems relative to tops; but at least in subterranean clover, the RGR of the roots was also slow. Other associated characteristics of the clovers, a month from emergence and at low phosphorus levels, were low phosphorus concentrations in the tops relative to nonlegumes, and a low proportion of their total phosphorus in the tops. The phosphorus content per unit weight of clover roots was low under these conditions. Differences between species in early growth rate were maintained on different soils, even though the soil solution contained widely different concentrations of phosphate. Establishment of species in the field, particularly during the seedling stage, is discussed in relation to growth rates at low and optimal levels of phosphorus.",
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A comparison of growth rates and phosphorus distribution in a range of pasture species. / Biddiscombe, E. F.; Ozanne, P. G.; Barrow, N. J.

In: Australian Journal of Agricultural Research, Vol. 20, No. 6, 01.01.1969, p. 1023-1033.

Research output: Contribution to journalArticle

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