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• W2537318655 abstract "A field micro-plot experiment for winter wheat was conducted in an irrigated winter wheat (Triticum aestivum)-summer maize (Zea mays L.) rotation system in Mazhuang, Xinji of Hebei prov- ince in the North China Plain, using the 15 N isotope method to determine the effects of N application (rates and timing), and irrigation frequency on urea- 15 N fate, residual-N and N recovery efficiency (NRE) of wheat. The experiment was conducted under two irrigation treatments (I2 and I3, represent- ing for two and three irrigations, respectively), at three N rates (150, 210, and 270, kg ha -1 ), divided between two 15 N-labeled applications of basal- 15 N (90 kg ha -1 ) and topdress- 15 N (60, 120, and 180, kg N ha -1 , respectively). The total N uptake by wheat (ranging from 186 to 238 kg ha -1 ) and the fertilizer-derived N (Ndff, about 34-55%) were measured. The Ndff from labeled basal- 15 N and from labeled topdress- 15 N were about 15-22% and 16-40%, respectively. The NRE (measured either as recovery in grain or as the total N recovery in the plant) was higher with I3 (39-41 or 47-49%) than with I2 (35-40 or 42-47%), showing maximum NRE in grain of about 40% both at N210 with I2 and at N150 with I3 treatment. The NRE by the first wheat crop (in grain or the total N recovery in plant) was higher with labeled topdress- 15 N (39-48 or 45-56%) as compared to that with labeled basal- 15 N (30-37 or 36-45%), while the unaccounted N losses were lower with labeled basal- 15 N (14-22%) relative to labeled topdress- 15 N (14-35%). Higher residual N in soils was found with labeled basal- 15 N (41-51%), as compared to labeled topdress- 15 N (18-35%). Resid- ual N in the 0- to 150-cm soil depth ranged from 26 to 44% while the unaccounted N losses ranged from 14 to 30%. Recovery of residual N by the 2nd and 3rd crops in the rotation was 5-10% in the maize crop and a further 1.7-3.5% in the subsequent wheat crop. The accumulated N recovery and the unaccounted N losses in continuous wheat-maize-wheat rotations derived from labeled topdress- 15 N were 54-64% and" @default.
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• W2537318655 date "2011-01-01" @default.
• W2537318655 modified "2023-09-26" @default.
• W2537318655 title "Fate of labeled urea- 15 N as basal and topdressing applications in an irrigated wheat-maize rotation system in North China Plain: I winter wheat" @default.
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