@article{PAR00007397,
  title = {{S}lumping dynamics in tilled sandy soils under natural rainfall and experimental flooding},
  author = {{H}ao, {H}. and {H}artmann, {C}hristian and {A}pichart, {J}. and {S}iwaporn, {S}. and {P}romsakha, {S}. and {R}ichard, {G}. and {B}ruand, {A}. and {D}exter, {A}.{R}.},
  editor = {},
  language = {{ENG}},
  abstract = {{C}ompaction of tilled layers under the single effect of rainfall or irrigation was called slumping. {S}lumping affects strongly root development and plant biomass production. {I}t has been observed in different soil types, but sandy soils appear particularly prone to this physical degradation. {O}ur objectives in this study were (i) to measure in the field the changes in soil structure and water status simultaneously, (ii) to study the effects of rainfall and management practices on slumping, and (iii) to propose a conceptual model for sandy soil slumping. {A}n experimental site was selected in {N}ortheast {T}hailand and we studied the effect of tillage depth and initial water content on slumping dynamic. {P}lots (9 m × 15 m each) were tilled at (i) two depths (20 and 40 cm, called {S} and previous term{D}next term respectively) in dry conditions, (ii) at 20 cm depth in dry or wet conditions (called {Y} and {W} respectively). {T}hese plots were submitted to natural rainfall for 20 or 61 days to get different total rainfall amounts (114 and 212 mm respectively). {I}n addition, smaller plots (0.24 m2 each) were used for experimental flooding irrigation (similar to measured rainfalls, i.e. 100 and 200 mm). {S}oil bulk density, soil surface elevation, soil water content and matric potential were measured. {A} decrease in soil elevation was observed in all treatments. {I}n the absence of erosion it was interpreted as a loss of porosity which resulted from slumping. {B}ulk density increased in all layers of the tilled profile (from 1.38 to 1.57 g cm?3). {I}n the surface layer (0-5 cm) this increase was systematically higher compared to deeper layer. {N}o significant difference in final bulk density was found between the {S} and {W} treatments, and between the {Y} and {W} treatments. {B}ulk density increased more rapidly in the {Y} and {W} treatments than in the {S} and previous term{D}next term treatments, even though the cumulative rainfall was lower. {A}fter the flooding experimen},
  keywords = {},
  booktitle = {},
  journal = {{S}oil and {T}illage {R}esearch},
  volume = {114},
  numero = {1},
  pages = {9--17},
  year = {2011},
  DOI = {10.1016/j.still.2011.03.004},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00007397},
}