02816naa a2200349 a 450000100080000000500110000800800410001902200140006002400520007410000240012624500990015026000090024950000310025852018130028965000130210265000250211565000130214065000250215365000290217865000160220765000160222365000090223965000180224870000190226670000160228570000250230170000230232670000230234970000200237270000190239277300550241121246932020-09-04       2020    bl uuuu     u00u1 u    #d  a0718-95087 ahttps://doi.org/10.1007/s42729-020-00322-x2DOI1 aPIEROZAN JUNIOR, C.  aNitrogen fertilizer recovery and partitioning related to soybean yield.h[electronic resource]  c2020  aPublished: 24 August 2020.  aThis study checked the nitrogen (N) uptake, fate of the N fertilizer, fertilizer recovery efficiency (FRE) and the residual amount of N fertilizer in the soil via 15N-labelled fertilizer applied to soybean (Glycine max L. Merr.), to explain any differences in the yields. Two soybean field experiments were established in Brazil, one conducted in a tropical (Trop) zone located at Cerrado Biome and the other in a subtropical (Subt) environment. The experimental design was a 2-factor in randomized complete block with four replications. Five doses of N (0, 20, 40, 80 and 120 kg ha−1) were applied at two soybean growth stages (VE and R3). For all treatments, except No-N, 15N-labelled fertilizer was used. The N uptake and the amount of N fertilizer were analysed in the roots, shoots, grains and whole plant, the FRE and yield by soybean, and the residual of fertilizer in the soil. The total N uptake (Nplant) was greater with fertilization at R3 stage compared to the other stage, and N application increased the yield just at this stage and in the Trop condition. The increase in N shoot (not specifically from fertilizer) with the application at R3 appeared to be related to the increased in yield. However, the N from fertilizer found in the plant shoot was about 20% higher when fertilizer was applied at VE compared with R3. Under Subt condition, the FRE averaging 55%. In contrast, the FRE decreased from low to high nitrogen rates (64 to 40%, respectively) when soybean grown under Trop condition. Most N from fertilizer (38%) was found in the grains, followed by the shoot (14.6%) and the root (0.58%). The use of N fertilizer at reproductive growth stages is a better approach to meet soybean N demand through N fertilization. Potential yield gains are more reliable under Trop condition.  aNitrogen  aNitrogen fertilizers  aSoybeans  aTropical agriculture  aFertilizante Nitrogenado  aGlycine Max  aNitrogênio  aSoja  aSolo Tropical1 aFAVARIN, J. L.1 aLAGO, B. C.1 aALMEIDA, R. E. M. de1 aOLIVEIRA, S. M. de1 aTRIVELIN, P. C. O.1 aOLIVEIRA, F. B.1 aGILABEL, A. P.  tJournal of Soil Science and Plant Nutrition, 2020.