A1 Journal article (refereed), original research

Processed agrifood residues for phosphorus recycling in the field


Open Access hybrid publication

Publication Details
Authors: Mäkelä J. Jaakko, Ketoja Elise, Kuisma Miia, Salo Tapio, Yli-Halla Markku, Kahiluoto Helena
Publisher: Elsevier
Publication year: 2019
Language: English
Related Journal or Series Information: Field Crops Research
Volume number: 238
Start page: 93
End page: 112
Number of pages: 20
ISSN: 0378-4290
JUFO-Level of this publication: 2
Open Access: Open Access hybrid publication
Location of the parallel saved publication: https://doi.org/10.1016/j.fcr.2019.04.003

Abstract

Processing of organic residues may affect plant-availability
of phosphorus (P) and thus the potential to recycle the nutrient, i.e., recyclability,
but empirical evidence in the field is lacking. In field experiments in clay
and silt loam soils with low available P, impact on P recyclability by cattle
manure and sewage sludge processing methods (composting, anaerobic digestion, lime-stabilization,
acid-oxidizer) and three application rates were assessed. Synthetic nitrogen
(N) and potassium (K) fertilizers were supplied in surplus and NPK served as a reference.
The differences in plant response were small at relevant application rates and
not consistently explained by solubility of fertilizer P. Least P was required
in composted manure for the same P uptake in silt loam, and composting was
beneficial to plant response in clay as well. Lime-stabilization of sewage
sludge had an adverse effect on P uptake in silt loam. Increasing application
rates of sewage sludge hardly enhanced but did not lower P uptake or yield even
at an excessive rate. Soil water-extractable P in the autumn liable to leaching
was increased by NPK only. In clay soil, sewage sludges performed better than
manures obviously due to anaerobic conditions caused by high precipitation, but
in silt loam the contrary was the case. In conclusion, the availability of P in
processed residues is more susceptible to weather and soil variables than in synthetic
fertilizer. P fertilization benefits in cereal cropping in current north
European conditions appear to be generally small.


Last updated on 2019-09-08 at 11:05