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Nitrogen and phosphorus uptake fromisotope-labeled fertilizers by sorghum and soil microorganisms

Traoré, O. Y .A.; Kiba, D. I.; Bünemann, E. K. and Oberson, A. (2020) Nitrogen and phosphorus uptake fromisotope-labeled fertilizers by sorghum and soil microorganisms. Agrosystems, Geosciences & Environment, 3 (1), pp. 1-17.

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Online at: https://acsess.onlinelibrary.wiley.com/doi/full/10.1002/agg2.20111

Summary

On nutrient‐depleted Lixisols from Burkina Faso, nutrient acquisition by crops and soil microbes mainly relies on the limited amounts of mineral and organic fertilizers applied by small‐scale farmers. The objective of this study was to determine simultaneously the uptake of nitrogen (N) and phosphorus (P) contained in organic and mineral fertilizers by sorghum [Sorghum bicolor (L.) Moench ] and soil microbial biomass. Double 15N and 33P direct and indirect labeling techniques were applied in a pot experiment to determine the contributions of different fertilizers to sorghum N and P uptake during 52 d of growth. In parallel, soil respiration, available, and microbial N and P were tracked in an incubation experiment. Sorghum derived 83–90% of P from fertilizers. Nitrogen from cattle manure was poorly available, contributing only 20% of the N taken up by sorghum. Water‐soluble mineral fertilizers increased soil N and P availability, resulting in the highest total N and P uptake by sorghum from fertilizers and soil among all treatments. The application of cowpea [Vigna unguiculata (L.) Walp.] residues induced microbial N and P immobilization, reducing sorghum N and P uptake to the level of the non‐fertilized treatment. The use of double 15N and 33P labeling elucidated the impact of fertilizers on soil nutrient pools. The low plant N/P ratio suggested N limitation for sorghum in the manure treatment. Cowpea residues were inefficient for sorghum nutrition, but they increased soil microbial nutrient pools. This study gives insights on the potential effects of legume residues used as green manure to build soil fertility.


EPrint Type:Journal paper
Keywords:fertilizers, nitrogen, phosphorus, nutrient management, Department of Soil Sciences
Agrovoc keywords:
LanguageValueURI
Englishfertilizershttp://aims.fao.org/aos/agrovoc/c_2867
Subjects: Soil > Soil quality
Research affiliation: Switzerland > ETHZ - Agrarwissenschaften
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil > Nutrient management
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil > Soil fertility
DOI:DOI: 10.1002/agg2.20111
Deposited By: Bünemann, Else
ID Code:38669
Deposited On:01 Dec 2020 12:20
Last Modified:01 Dec 2020 12:21
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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