@article{fdi:010071312,
  title = {{E}ffect of conversion from sugarcane preharvest burning to residues green trashing on {SOC} stocks and soil fertility status : results from different soil conditions in {B}razil},
  author = {{L}uca, {E}. {F}. and {C}haplot, {V}incent and {M}utema, {M}. and {F}eller, {C}hristian and {F}erreira, {M}. {L}. and {C}erri, {C}. {C}. and {C}outo, {H}. {T}. {Z}.},
  editor = {},
  language = {{ENG}},
  abstract = {{L}and use and land management have a recognized impact on the cycle of elements such as carbon and nitrogen and are thus expected to play an important role in the mitigation against human-induced environmental changes such as global warming. {B}razil is the world's largest producer of sugarcane and has in recent years, experienced a shift from traditional cane preharvest burning ({B}) to mechanized green-trashing ({GT}), whose consequences on soil organic carbon and nutrients are still uncertain. {T}his study performed in the {S}ao-{P}aulo state, {S}outheast {B}razil, investigated the impact of shifting from {B} to {GT} on soil organic carbon and nitrogen stocks, and chemical elements at three 4-year and one 12-year old trial sites. {S}oil samples were collected from four sites representing different soil types (clayey to sandy-clay {H}apludox; {H}apudult and sandy {Q}uartzpsamment). {S}ampling was up to 0.4 m (0-0.05; 0.05-0.1; 0.1-0.2; 0.2-0.4 m) depths at six randomly selected pits from six plots (of 0.2 ha size each) per treatment arranged in randomized block design. {T}he samples were analysed for carbon and nitrogen content and other soil properties such as texture, bulk density, aggregate stability, p{H} and chemical concentrations. {O}verall, conversion from {B} to {GT} increased fresh organic matter retained on soil surface by 12.8-13.0 {M}g ha(-1) y(-1), and soil organic carbon and nitrogen stocks in the top 0.4 m soil layer by 1.06 {M}g {C} ha(-1) y(-1) and 0.11 {M}g {N} ha(-1) y(-1), respectively. {T}he highest carbon sequestration rate (108%o y(-1)) occurred in the most carbon depleted soils, which were sandy soils with lowest proportion of macroaggregates and chemical elements such as calcium, magnesium and potassium. {A}ll the chemical elements also showed a general increase in concentration, especially within the topmost soil layer, because increased soil organic matter had greater ability to tighten them together. {C}onsidering the average sequestration rate of 1.06 ton ha-1 y(-1), the resulting soil carbon sequestration rate for {B}razil where 8.8 million hectares are under green-trashing of sugarcane residues would be 9.3 million ton {C} y(-1). {H}owever, intermittent tillage every 4-5 years for replanting poses limitations to carbon sequestration because a 12 year experiment which was sampled 1 year after replanting did not show any carbon sequestration, suggesting that all carbon stored between planting and replanting was lost at tillage. {T}here is need for further research to quantify the dynamics of carbon stocks during and immediately after tillage and to fmd sugarcane replanting techniques which minimize soil disturbance and associated carbon losses.},
  keywords = {{C} sequestration ; {G}reen-trashing ; {L}and degradation ; {S}oil aggregation ; {S}oil fertility ; {BRESIL}},
  booktitle = {},
  journal = {{G}eoderma},
  volume = {310},
  numero = {},
  pages = {238--248},
  ISSN = {0016-7061},
  year = {2018},
  DOI = {10.1016/j.geoderma.2017.09.020},
  URL = {https://www.documentation.ird.fr/hor/fdi:010071312},
}