Straw amendment and nitrification inhibitor controlling N losses and immobilization in a soil cooling-warming experiment
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Straw amendment and nitrification inhibitor controlling N losses and immobilization in a soil cooling-warming experiment. / Chen, Hao; Rosinger, Christoph; Blagodatsky, Sergey et al.
In: Science of the Total Environment, Vol. 870, 162007, 20.04.2023.Research output: Journal contributions › Journal articles › Research
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TY - JOUR
T1 - Straw amendment and nitrification inhibitor controlling N losses and immobilization in a soil cooling-warming experiment
AU - Chen, Hao
AU - Rosinger, Christoph
AU - Blagodatsky, Sergey
AU - Reichel, Rüdiger
AU - Li, Bo
AU - Kumar, Amit
AU - Rothardt, Steffen
AU - Luo, Jie
AU - Brüggemann, Nicolas
AU - Kage, Henning
AU - Bonkowski, Michael
N1 - Publisher Copyright: © 2023 Elsevier B.V.
PY - 2023/4/20
Y1 - 2023/4/20
N2 - It is common practice in agriculture to apply high‑carbon amendments, e.g. straw, or nitrification inhibitors (NI) to reduce soil nitrogen (N) losses. However, little is known on the combined effects of straw and NI and how seasonal soil temperature variations further affect N immobilization. We conducted a 113-day mesocosm experiment with different levels of 15N-fertilizer application (N0: control; N1: 125 kg N ha−1; N2: 250 kg N ha−1) in an agricultural soil, amended with either wheat straw, NI or a combination of both in order to investigate N retention and loss from soil after a cooling-warming phase simulating a seasonal temperature shift, i.e., 30 days cooling phase at 7 °C and 10 days warming phase at 21 °C. Subsequently, soils were planted with barley as phytometers to study 15N-transfer to a following crop.Straw addition significantly reduced soil N-losses due to microbial N immobilization. Although carbon added as straw led to increased N2O emissions at high N fertilization, this was partly counterbalanced by NI. Soil cooling-warming strongly increased ammonification (+77 %), while nitrification was suppressed, and straw-induced microbial N immobilization dominated. N immobilized after straw addition was mineralized at the end of the experiment as indicated by structural equation models. Re-mineralization in N2 was sufficient, but still suboptimal in N0 and N1 at critical times of early barley growth. N-use efficiency of the 15N tracer decreased with fertilization intensity from 50 % in N1 to 35 % in N2, and straw amendment reduced NUE to 25 % at both fertilization rates. Straw amendment was most powerful in reducing N-losses (−41 %), in particular under variable soil temperature conditions, but NI enforced its effects by reducing N2O emission (−40 %) in N2 treatment. Sufficient N-fertilization coupled with straw application is required to adjust the timely re-mineralization of N for subsequent crops.
AB - It is common practice in agriculture to apply high‑carbon amendments, e.g. straw, or nitrification inhibitors (NI) to reduce soil nitrogen (N) losses. However, little is known on the combined effects of straw and NI and how seasonal soil temperature variations further affect N immobilization. We conducted a 113-day mesocosm experiment with different levels of 15N-fertilizer application (N0: control; N1: 125 kg N ha−1; N2: 250 kg N ha−1) in an agricultural soil, amended with either wheat straw, NI or a combination of both in order to investigate N retention and loss from soil after a cooling-warming phase simulating a seasonal temperature shift, i.e., 30 days cooling phase at 7 °C and 10 days warming phase at 21 °C. Subsequently, soils were planted with barley as phytometers to study 15N-transfer to a following crop.Straw addition significantly reduced soil N-losses due to microbial N immobilization. Although carbon added as straw led to increased N2O emissions at high N fertilization, this was partly counterbalanced by NI. Soil cooling-warming strongly increased ammonification (+77 %), while nitrification was suppressed, and straw-induced microbial N immobilization dominated. N immobilized after straw addition was mineralized at the end of the experiment as indicated by structural equation models. Re-mineralization in N2 was sufficient, but still suboptimal in N0 and N1 at critical times of early barley growth. N-use efficiency of the 15N tracer decreased with fertilization intensity from 50 % in N1 to 35 % in N2, and straw amendment reduced NUE to 25 % at both fertilization rates. Straw amendment was most powerful in reducing N-losses (−41 %), in particular under variable soil temperature conditions, but NI enforced its effects by reducing N2O emission (−40 %) in N2 treatment. Sufficient N-fertilization coupled with straw application is required to adjust the timely re-mineralization of N for subsequent crops.
KW - Ecosystems Research
KW - 15N labelling
KW - N immobilization
KW - Nitrification
KW - Nitrogen use efficiency
KW - Soil microbial biomass
KW - Temperature effect
KW - N immobilization
KW - Nitrification
KW - Soil microbial biomass
KW - Temperature effect
KW - 15N labelling
KW - Nitrogen use efficiency
UR - https://www.mendeley.com/catalogue/ab77d0cb-401d-34bd-826c-999587cdeb6d/
UR - http://www.scopus.com/inward/record.url?scp=85147607321&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2023.162007
DO - 10.1016/j.scitotenv.2023.162007
M3 - Journal articles
C2 - 36739009
VL - 870
JO - The Science of The Total Environment
JF - The Science of The Total Environment
SN - 0048-9697
M1 - 162007
ER -