Abstract
Aims and background
The phosphorus (P) fertilizer value of organic materials (OM) such as plant residues or manure can be larger than that of mineral fertilizers in weathered soils. Recently, the diffusive gradients in thin films (DGT) technique was shown to better predict crop response to applied mineral P fertilizer among soils than established tests. The goal of this study is to evaluate the potential of the DGT technique to predict plant-available P in different soils amended with various qualities of OM.
Methods
In this study, maize was grown in a greenhouse on two Kenyan soils characterized by strong P sorption. Phosphorus was applied at various rates (deficient to adequate) as triple superphosphate (TSP) only, or at one intermediate P dose in a P-substitution trial with four different OM: farmyard manure (FYM) or residues of Tithonia diversifolia each at low or high P content. All soils were amended with adequate amounts of other nutrients. Next to the DGT technique, two established soil P tests (anion exchange membranes (AEM), and Olsen) were performed on incubated soils for all P treatments.
Results
Results show that the relative yield (% of maximum yield) to soil P test values correlated most strongly for DGT measured P concentrations, R2 = 0.74, compared to Olsen (R2 = 0.60) and AEM (R2 = 0.62).
Conclusions
Results of this study demonstrate that DGT relates best with DM yields when soils are amended with a combination of TSP and OM compared to the established soil P tests Olsen and AEM.
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Abbreviations
- AEM:
-
Anion exchange membranes
- CDGT:
-
Time‐averaged concentration in solution at the surface of the DGT device
- CLM:
-
Confidence limits
- DGT:
-
Diffusive gradients in thin films
- DM:
-
Dry matter
- FU:
-
Factor of uncertainty
- FYM:
-
Farmyard manure
- ICP‐OES:
-
Inductively coupled plasma optical emission spectroscopy
- MBL:
-
Mixed binding layer
- OM:
-
Organic materials
- PSI:
-
P sorption index
- RY:
-
Relative yield
- Ti:
-
Tithonia diversifolia
- TSP:
-
Triple superphosphate
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Acknowledgments
We would like to thank all the collaborators, the technical staff of the Division of Soil and Water Management at K.U.Leuven and the Soil Science Department of Moi University in Chepkoilel, Kenya, who assisted in analyses and collection of the soil samples and organic materials. We also thank dr. Sean Mason for training in the DGT method, Abigael Otinga, for her valuable assistance during the experiments. Laetitia Six acknowledges a PhD fellowship from the Fund for Scientific Research (FWO-Vlaanderen). Part of this research was made possible through the VLIR Institutional University Collaboration programme between Flemish Universities and Moi University, Eldoret, Kenya.
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Six, L., Smolders, E. & Merckx, R. Testing phosphorus availability for maize with DGT in weathered soils amended with organic materials. Plant Soil 376, 177–192 (2014). https://doi.org/10.1007/s11104-013-1947-y
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DOI: https://doi.org/10.1007/s11104-013-1947-y