02766naa a2200397 a 450000100080000000500110000800800410001902000220006010000260008224501580010826000090026630000150027552013620029065000150165265000290166765000110169665000150170765000200172265300330174265300090177565300260178465300330181065300240184365300310186770000160189870000330191470000230194770000240197070000150199470000140200970000240202370000230204770000180207070000200208877302600210821362642024-01-09       2021    bl uuuu     u00u1 u    #d  a978-92-5-134897-01 aBERNARDI, A. C. de C.  aIncreasing yield and carbon sequestration in a signalgrass pasture by liming and fertilization in São Carlos, São Paulo, Brazil.h[electronic resource]  c2021  ap.352-363.  aThis study case aimed to evaluate the impact of liming and mineral fertilization of a Signalgrass pasture on C accumulation in surface and deeper layers of a Brazilian Oxisol. A 27-yr old Signalgrass pasture ((Urochloa decumbens cv. Basilisk Stapf (Syn: Brachiaria)) was used in the trial. This pasture has been grazed in a stocking rate of one animal per ha and did not receive any liming and fertilizer until the beginning of the experiment. Treatments used in a 6-year trial are described in Table 129, and both limestone and fertilizers were applied to the soil surface with no soil plowing or disc-harrowing. Soil C stocks were calculated in equivalent soil mass, taking the native Cerrado (Savanna forest) soil mass as reference. Limed soil (0-100 cm) under non-fertilized pasture showed an annual increase of 1.71 tC/ha after 6 years over the soil under native vegetation. In contrast, fertilization of low productive and degraded pasture resulted in C accumulation rates varying from 5.4 to 7.2 t/ha/yr. The results illustrate that despite the C saturation in the surface soil layer, as evidenced by a sigmoid relationship between C contents in the whole soil and the clay fraction through the soil profile, the large proportion of C accumulation (from 55 to 68 percent) in deeper soil layers makes tropical pasture soils suitable long-term C sinks.  aGrasslands  aGreenhouse gas emissions  aLiming  aNo-tillage  aSoil management  aAdaptation to climate change  aILPF  aMineral fertilization  aMitigation to climate change  aPotential drawbacks  aSoil organic carbon stocks1 aSEGNINI, A.1 aPRIMAVESI, O. M. A. S. P. R.1 aOLIVEIRA, P. P. A.1 aPEZZOPANE, J. R. M.1 aBERNDT, A.1 aBAYER, C.1 aMILORI, D. M. B. P.1 aSILVA, W. T. L. da1 aSIMOES, M. L.1 aMARTIN NETO, L.  tIn: FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS. Recarbonizing global soils: a technical manual of recommended management practices. Rome: FAO, 2021. (Cropland, grassland, integrated systems and farming approaches: case studeisgv.4). Cap. 32.