The response to phosphate of two annual pasture species. I. Effect of the soil’s ability to adsorb phosphate on comparative phosphate requirement

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Abstract

Eleven soils which differed widely in their ability to adsorb phosphate were used in a pot trial to compare the response to phosphate by subterranean clover (Trifolium subterraneum L.) with that by Wimmera ryegrass (Lolium rigidum Gaud.). Response curves were fitted to the yields (log-transformed). The coefficients of the curves were used to calculate both the relative effectiveness of the phosphate and the phosphate required to give a given fraction of the increase in log yield due to phosphate. Overall, the phosphate requirement for the grass was less than for the clover but the two species were affected differently by the soil’s ability to adsorb phosphate. The phosphate requirement for the clover increased more rapidly with increasing adsorption by the soil than the phosphate requirement for the grass.

Original languageEnglish
Pages (from-to)137-143
Number of pages7
JournalAustralian Journal of Agricultural Research
Volume26
Issue number1
DOIs
Publication statusPublished - 1 Jan 1975
Externally publishedYes

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Soil
Phosphates
phosphates
Medicago
soil
Lolium rigidum
Lolium
Trifolium subterraneum
Poaceae
grasses
Trifolium
annual pastures
Adsorption
adsorption

Cite this

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AB - Eleven soils which differed widely in their ability to adsorb phosphate were used in a pot trial to compare the response to phosphate by subterranean clover (Trifolium subterraneum L.) with that by Wimmera ryegrass (Lolium rigidum Gaud.). Response curves were fitted to the yields (log-transformed). The coefficients of the curves were used to calculate both the relative effectiveness of the phosphate and the phosphate required to give a given fraction of the increase in log yield due to phosphate. Overall, the phosphate requirement for the grass was less than for the clover but the two species were affected differently by the soil’s ability to adsorb phosphate. The phosphate requirement for the clover increased more rapidly with increasing adsorption by the soil than the phosphate requirement for the grass.

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