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Title: Growth and phosphorus uptake of faba bean and cotton are related to Colwell-P concentrations in the subsoil of Vertosols
Contributor(s): McLaren, Tim (author); Bell, M J (author); Rochester, I J (author); Guppy, Christopher  (author)orcid ; Tighe, Matthew  (author); Flavel, Richard  (author)
Publication Date: 2013
DOI: 10.1071/CP13025
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Abstract: Recent studies report low and variable phosphorus (P) fertiliser use efficiency (PUE) for cotton in the northern grains region (NGR) of eastern Australia. This may be due to cotton accessing P pools that are not currently tested for in the subsoil (10-30 cm) or variation in response to P source and placement strategy. Two glasshouse studies were used to investigate this, incorporating two soil P tests to assess readily and slowly available P pools (Colwell, and a dilute acid colloquially referred to as the BSES extractant), and five different P fertiliser placement strategies in the subsoil. Eighteen Vertosols were collected across southern to central Queensland in the NGR, and then used to grow faba bean ('Vicia faba' L.) and cotton ('Gossypium hirsutum' L.) sequentially in the same 28-L pot. Readily available P pools assessed by Colwell-P were of major importance for faba bean and cotton dry matter, as well as for tissue P concentrations. Cotton was less responsive to extractable subsoil P concentrations than faba bean, suggesting either greater internal PUE or improved ability to accumulate P under conditions of limited availability. We recommend that subsoil P fertilisation should occur before sowing faba bean to maximise PUE in a cotton-faba bean rotation. Faba bean and cotton both recovered more P when the subsoil was fertilised, but no individual P fertiliser placement strategy was superior. Phosphorus extracted using the BSES method was not correlated with faba bean or cotton dry matter or tissue P concentration over the single crop cycle. We also recommend that Colwell-P be measured in the topsoil and subsoil to understand the quantity of plant-available P in Vertosols of the NGR, and that further research is needed to describe the resupply of the readily available P pool from slowly available P pools during a single crop cycle.
Publication Type: Journal Article
Source of Publication: Crop and Pasture Science, 64(8), p. 825-833
Publisher: CSIRO Publishing
Place of Publication: Canberra, Australia
ISSN: 1836-0947
Field of Research (FOR): 070306 Crop and Pasture Nutrition
050304 Soil Chemistry (excl Carbon Sequestration Science)
Socio-Economic Outcome Codes: 820301 Cotton
820599 Winter Grains and Oilseeds not elsewhere classified
961402 Farmland, Arable Cropland and Permanent Cropland Soils
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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