Soil sulfur—crop response calibration relationships and criteria for field crops grown in Australia
In: Crop and Pasture Science, Jg. 64 (2013), Heft 5, S. 523-530
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Zugriff:
Accurate definition of the sulfur (S) soil test–crop grain yield increase (response) relationship is required before soil S test measurements can be used to if there are likely to be responses to S fertilisers. An analysis was done using the Better Fertiliser Decision for Crops (BFDC) National Database using a web application (BFDC Interrogator) to develop calibration relationships between soil S tests (KCl-40 and MCP) using a selection of sampling depths and grain relative yields (RY). Critical soil test values (CSTV) and critical soil test ranges (CSTR) were defined at RY 90%. The ability of the KCl-40 extractable S soil test to predict grain yield response to applied S fertiliser was examined for wheat (Triticum aestivum L.) grown in Western Australia (WA), New South Wales (NSW), and Victoria and canola (Brassica napus L.) grown in WA and NSW. A smaller dataset using MCPi-extractable S was also assessed. The WA-grown wheat KCl-40 S CSTV, using sampling depth to 30cm for soil types Chromosols (Coloured), Chromosols (Sesqui-Nodular), Kandosols (Grey and Yellow), Tenosols (Brown and Yellow), and Tenosols (Grey, Sesqui-Nodular), was 2.8mgkg-1 with an associated CSTR 2.4–3.2mgkg-1 and a correlation coefficient (r) 0.87. Similarly, KCl-40 S CSTV was defined using sampling depth to 10cm for these selected soil types and for wheat grown on Vertosols in NSW. The accuracy of the KCl-40 S CSTV for canola grown in WA was improved using a sampling to a depth of 30cm instead of 10cm for all soil types. The canola KCl-40 S CSTV using sampling depth to 30cm for these soil types was 7.2mgkg-1 with an associated CSTR 6.8–7.5 and an r value 0.70. A similar KCl-40 S CSTV of 7.0mgkg-1 was defined using a sampling depth of 10cm, but the CSTR was higher (6.4–7.7mgkg-1) and the r value lower (0.43). A lower KCl-40 S CSTV of 3.9mgkg-1 or 31.0kgha-1 using a sampling depth of 60cm was defined for canola grown in NSW using a limited number of S-rate calibration treatment series. Both MCPi (r=0.32) and KCl-40 (r <0.20) soil S test–NSW canola response relationships using a 0–10cm sampling depth were weak. The wheat KCl-40 S CSTR of 2.4–3.2mgkg-1 can be used widely on soil types where soil sulfate is not leached during the growing season. However, both the WA canola CSTR of 6.4–7.2mgkg-1 using a sampling depth of 30cm and NSW canola CSTR of 25–39kgha-1 or 3.1–4.9mgkg-1 using a sampling depth of 60cm can be considered in regions outside of WA and NSW.
Titel: |
Soil sulfur—crop response calibration relationships and criteria for field crops grown in Australia
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Autor/in / Beteiligte Person: | Anderson, Geoffrey C. ; Peverill, Ken I. ; Brennan, Ross F. |
Zeitschrift: | Crop and Pasture Science, Jg. 64 (2013), Heft 5, S. 523-530 |
Veröffentlichung: | 2013 |
Medientyp: | serialPeriodical |
ISSN: | 1836-0947 (print) ; 1836-5795 (print) |
DOI: | 10.1071/CP13244 |
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