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The use of nitrogen, phosphorus and lime to limit the competitive ability of Aristida armata in the establishment phase

Autor: Roger Armstrong, RF Brown, KR Helyar

Publikováno v: Australian Journal of Agricultural Research. 44:165

The de Wit replacement series methodology was used to see if applying phosphorus, nitrogen and lime to the sandy red earth soils of mulga grazing lands can give a competitive advantage to the desirable species Cenchrus ciliaris C.V. U.S.A., Digitaria

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f3eac930078ef73e37d7c9e96c003473
https://doi.org/10.1071/ar9930165

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Utilization of labeled mineral and organic phosphorus sources by grasses common to semi-arid mulga shrublands

Autor: Roger Armstrong, KR Helyar

Publikováno v: Soil Research. 31:271

We examined whether the differing growth responses to varying concentrations of soil P by grasses common to the mulga shrublands of south-west Queensland were due to differences in their ability to utilize sparingly soluble sources of P in two glassh

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f3dac268796e048c86a8d8bcafc206bd
https://doi.org/10.1071/sr9930271

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Relative importance of soil phosphorus to the growth of wiregrass (Aristida armata) compared with other grasses common to the mulga shrublands of Queensland

Autor: Roger Armstrong, KR Helyar

Publikováno v: Australian Journal of Experimental Agriculture. 33:337

The influence of phosphorus (P) applied to mulga topsoil on the growth of Aristida amata, Cenclirus ciliaris, Digitaria ammophila, and Thyridolepis mitchelliana was examined in2 glasshouse trials, to test the hypothesis that the invasion of A. amata

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bb16b8549069939e620a5e27f1abc4eb
https://doi.org/10.1071/ea9930337

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The P fertilizer requirements of subterranean clover, and the soil P status, sorption and buffering capacities from two P analyses

Autor: WJ Muller, BS Dear, B Loveland, KR Helyar

Publikováno v: Soil Research. 30:27

The phosphorus fertilizer requirement of subterranean clover (Trifolium subterraneum) was determined on a number of soils in field and glasshouse experiments. The solution phosphorus concentration in a 0.01 M CaCl2 extract (SPC0) determined from a ph

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7af632335686af9679260313542e01f3
https://doi.org/10.1071/sr9920027

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Changes in soil phosphate fractions in the rhizosphere of semi-arid pasture grasses

Autor: KR Helyar, Roger Armstrong

Publikováno v: Soil Research. 30:131

The comparative ability of several species of grass common to the semi-arid mulga shrublands of south-western Queensland, namely Cenchrus ciliaris cv. U.S.A., Aristida armata, Digitaria ammophilla and Thyridolepis mitchelliana, to deplete various fra

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1f51a54455e7229ae3300d3d4388067f
https://doi.org/10.1071/sr9920131

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Vesicular-arbuscular mycorrhiza in semi-arid pastures of south-west Queensland and their effect on growth responses to phosphorus fertilizers by grasses

Autor: Roger Armstrong, KR Helyar, EK Christie

Publikováno v: Australian Journal of Agricultural Research. 43:1143

Field and controlled environment studies were undertaken to determine the seasonal variation in vesicular-arbuscular mycorrhizal (VAM) propagules under different types of vegetation in the mulga (Acacia aneura) shrublands of south-western Queensland

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::feb6dde81f7e4f96369b8324c175986a
https://doi.org/10.1071/ar9921143

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Soil acidity in New-South-Wales - Current pH values and estimates of acidification rates

Autor: DL Godyn, PD Cregan, KR Helyar

Publikováno v: Soil Research. 28:523

An estimate has been made of the mean pH of the surface soils (0-10 or 0-15 cm) of New South Wales by mapping the soil pH (1:2, soil: 0.01 M CaCl2) values of soil samples analysed by the NSW Agriculture & Fisheries soil testing service. Within mapped

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::56ee0df53495b4bb56aaf7f6d98208ce
https://doi.org/10.1071/sr9900523

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Soil acidification under subterranean clover (Trifolium subterraneum L.) pastures in north-eastern Victoria

Autor: WJ Slattery, KR Helyar, AM Ridley

Publikováno v: Australian Journal of Experimental Agriculture. 30:195

Eleven paired soil samples to 60 cm depth were collected from grazing properties in north-eastern Victoria. Soils were naturally acid and most were red or yellow podsolics. At each site unfertilised soils (unimproved) and soils which had received reg

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5055276c3faaf69ae0d2e1a5abd0a649
https://doi.org/10.1071/ea9900195

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The importance of the carbon cycle to acidification of a grazed annual pasture

Autor: AM Ridley, A Cowling, KR Helyar, WJ Slattery

Publikováno v: Australian Journal of Experimental Agriculture. 30:529

Soil samples to a depth of 60 cm were collected from 3 fields of a 73-year-old experiment in north-eastern Victoria. One field (unfertilised) had never received fertiliser, whereas, the other 2 fields (fertilised) had received 4.5 t/ha superphosphate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7e78dadf3011fcf8d23ce62f6de0a752
https://doi.org/10.1071/ea9900529

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