caa a22 4500 606219129 CHVBK 20210128101116.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s11104-015-2438-0 doi (NATIONALLICENCE)springer-10.1007/s11104-015-2438-0 Gross nitrogen mineralization and immobilization in temperate maize-soybean intercrops [Elektronische Daten] [Alison Regehr, Maren Oelbermann, Cecilia Videla, Laura Echarte] Background and aims: Reliance on nitrogen (N) fertilizers to maintain crop productivity requires a thorough understanding of the transformation of this nutrient within the soil-plant system. Organic matter input from a mixture of crop residues, such intercrop systems, influence N transformations differently compared to sole crops. We tested the hypothesis that N mineralization and immobilization differ between cereal-legume intercrops and sole crops. Methods: A short-term experiment using 15N isotopic pool dilution was conducted in 2007 and 2012 in maize (Zea mays L.) and soybean (Glycine max L. Merr.) sole crops and 1:2 (1 row maize:2 rows soybean) and 2:3 (two rows maize:3 rows soybean) intercrops. Soil characteristics, gross mineralization and immobilization, and net immobilization to a 10cm depth were quantified. Results: Soil characteristics (pH, bulk density, soil organic carbon (C), total N, and C:N) were not significantly different (P < 0.05) among treatments, but differed significantly (P < 0.05) between years (2007 vs. 2012). Soil NH4 +-N was significantly lower (P < 0.05) in the maize sole crop. Gross N mineralization, immobilization and net immobilization, were significantly different (P < 0.05) among treatments and between years. Relative NH4 +-N immobilization was significantly different (P < 0.05) among treatments and between years, showing the lowest values in the intercrops. The amount of NH4 +-N mineralized per day was significantly greater (P < 0.05) in the 2:3 intercrop and was significantly different (P < 0.05) between years in the 2:3 intercrop. Residence time of NH4 +-N was significantly longer (P < 0.05) in the soybean sole crop and 1:2 intercrop followed by the 2:3 intercrop and the maize sole crop. Conclusions: Intercropping contributed to the long-term immobilization of N and therefore was a more sustainable land-management practice than sole cropping. The adoption of cereal-legume intercrops will curb our currently growing reliance on N fertilizers. Springer International Publishing Switzerland, 2015 Argentine pampa nationallicence Cereal-legume nationallicence Crop residues nationallicence Isotope pool dilution nationallicence Legumes nationallicence 15N nationallicence NH4 +-N residence time nationallicence Regehr Alison Department of Environment and Resource Studies, University of Waterloo, Waterloo, ON, Canada aut Oelbermann Maren Department of Environment and Resource Studies, University of Waterloo, Waterloo, ON, Canada aut Videla Cecilia University of Mar del Plata Balcarce, Ruta 226 km 73.5, C.C. 276 (7620), Balcarce, Argentina aut Echarte Laura CONICET, EEA INTA Balcarce, Ruta 226 km 73.5, C.C. 276 (7620), Balcarce, Argentina aut Plant and Soil Springer International Publishing 391/1-2(2015-06-01), 353-365 0032-079X 391:1-2<353 2015 391 11104 https://doi.org/10.1007/s11104-015-2438-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-015-2438-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Regehr Alison Department of Environment and Resource Studies, University of Waterloo, Waterloo, ON, Canada aut NATIONALLICENCE 700 1- Oelbermann Maren Department of Environment and Resource Studies, University of Waterloo, Waterloo, ON, Canada aut NATIONALLICENCE 700 1- Videla Cecilia University of Mar del Plata Balcarce, Ruta 226 km 73.5, C.C. 276 (7620), Balcarce, Argentina aut NATIONALLICENCE 700 1- Echarte Laura CONICET, EEA INTA Balcarce, Ruta 226 km 73.5, C.C. 276 (7620), Balcarce, Argentina aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 391/1-2(2015-06-01), 353-365 0032-079X 391:1-2<353 2015 391 11104