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Early maize root and phosphorus uptake responses to localised application of sewage sludge derived fertilisers

Lemming, Camilla; Oberson, Astrid; Hund, Andreas; Stoumann Jensen, Lars and Magid, Jakob (2015) Early maize root and phosphorus uptake responses to localised application of sewage sludge derived fertilisers. Plant and Soil. [Submitted]

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Background: Phosphorus recycling from waste and localised placement of fertilisers can be means to improve sustainable P management in agriculture. However, knowledge about root and plant P uptake responses to placement of complex waste- derived fertilisers is lacking.
Methods: Sewage sludge (SS) and sewage sludge ash (ASH) were tested against triple superphosphate (TSP) in a rhizobox setup where shoot and root growth of maize was followed for 30 days. The three P sources were either mixed homogenously into the soil (labelled with 33P) or localised in a patch close to the seed.
Results: While localised TSP and SS both increased root length density around the fertiliser patch, it was at the expense of the remaining root system and soil P uptake for SS. Hence, total P uptake was slightly lower and dry matter yields similar to mixed SS. Thus, only TSP enhanced dry matter yield and fertiliser P uptake compared to the mixed source. No root response was found for localised ASH, and mixed ASH more than doubled dry matter yield and P uptake in comparison.
Conclusions: Localised placement of fertilisers can be expected to be beneficial for young maize plants only for fertiliser types that can supply sufficient amounts of readily available P.

EPrint Type:Journal paper
Keywords:Fertiliser placement, root growth, sewage sludge, sewage sludge ash, rhizobox, maize
Subjects: Soil > Nutrient turnover
Research affiliation: Denmark > Organic RDD 1 > RoCo
Deposited By: Magid, Assoc. Prof. Jakob
ID Code:29273
Deposited On:26 Aug 2015 11:49
Last Modified:26 Aug 2015 11:49
Document Language:English
Refereed:Submitted for peer-review but not yet accepted

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