02126naa a2200277 a 450000100080000000500110000800800410001902400480006010000250010824501270013326000090026052012530026965300240152265300440154665300360159065300320162670000190165870000170167770000200169470000170171470000230173170000210175470000190177570000170179477300370181121544162023-06-13 2023 bl uuuu u00u1 u #d7 ahttps://doi.org/10.3390/plants120816472DOI1 aFIGUEIREDO, C. C. de aNitrogen use efficiency in an agrisilviculture system with Gliricidia sepium in the Cerrado Region.h[electronic resource] c2023 aGliricidia (Gliricidia sepium) is a tree legume that has great potential for use in agriculture because of its multiple-use characteristics. However, there is little information in the literature about the effect of agrisilvicultural systems on nitrogen (N) cycling. This study evaluated the effect of densities of gliricidia on N cycling under an agrisilvicultural system. The treatments were composed of different densities of gliricidia: 667, 1000 and 1333 plants ha−1, with a fixed spacing of 5 m between the alleys. The efficiency of N use was investigated by using the 15N isotope tracer. In each plot, a transect perpendicular to the tree rows was established in two positions: (i) in the corn (Zea mays) row adjacent to the trees, and (ii) in the corn row in the center of the alley. The N fertilizer recovery efficiency ranged from 39% in the density of 667 plants ha−1 to 89% with 1000 plants ha−1. The effect of gliricidia on the N uptake by corn was higher in the central position of the alley with 1000 plants ha−1. The agrisilvicultural system with 1000 plants ha−1 was highly efficient in the recovery of mineral N, representing an excellent option for integrated production systems in tropical regions. aAgroforestry system aIntegrated crop livestock forest system aLow carbon emission agriculture aSustainable intensification1 aMOREIRA, T. N.1 aCOSER, T. R.1 aSILVA, L. P. da1 aLEITE, G. G.1 aCARVALHO, A. M. de1 aMALAQUIAS, J. V.1 aMARCHAO, R. L.1 aURQUIAGA, S. tPlantsgv. 12, n. 8, 1647, 2023.