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DOI: 10.5445/IR/1000081044
DOI: 10.1016/j.agee.2018.02.021

Nitrogen fertilizer fate after introducing maize and upland-rice into continuous paddy rice cropping systems

Fuhrmann, Irabella; He, Yao; Lehndorff, Eva; Brüggemann, Nicolas; Amelung, Wulf; Wassmann, Reiner; Siemens, Jan

Water scarcity and economic incentives favor the introduction of upland crops into permanent paddy rice systems during dry seasons. However, introducing upland crops into permanently flooded cropping systems temporarily
changes soil conditions from anaerobic to aerobic, affecting nitrogen (N) dynamics profoundly. We hypothesized that under maize and dry rice, total fertilizer $^{15}$N recovery in soil as well as the immobilization of fertilizer $^{15}$N in microbial residues is reduced compared with continuous paddy rice cropping. Furthermore, we expected enhanced emissions of fertilizer $^{15}$N in form of nitrous oxide (N₂O) under maize and dry rice. To test these hypotheses, we traced the fate of a $^{15}$N-urea pulse in a field experiment in the Philippines with three different crop rotations: continuous paddy rice, paddy rice – dry rice, and paddy rice – maize for two years. Indeed, the $^{15}$N recovery in the first 5 cm of bulk soil was lowest in the paddy rice – maize rotation (arithmetic mean with standard error: 19.2 ± 1.8% of applied $^{15}$N), while twice as much was recovered in the first 5 cm of bulk soil of the conti ... mehr

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung (IMK)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 0167-8809, 1873-2305
URN: urn:nbn:de:swb:90-810447
KITopen ID: 1000081044
Erschienen in Agriculture, ecosystems & environment
Band 258
Seiten 162-171
Vorab online veröffentlicht am 27.02.2018
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