Aporte de carbono org芍nico de la labranza cero y su impacto en la estructura de un andisol de la Precordillera Andina Chilena

作者：Sandoval Estrada; Marco; Stolpe Lau; Neal; Zagal Venegas; Erick; Mardones Flores; Maria; Celis Hidalgo; Jose

来源：Agrociencia, 2008.

• conservation tillage
• organic matter
• aggregate stability
• soil.

the intensive use of soils derived from volcanic ash, due to an increase in livestock and agricultural activities, has generated losses from increasing water erosion in the soils, which are reflected in lower production and an increase in the demand for agricultural inputs. therefore, this study was conducted to evaluate, after three years, the structural state of a soil (typic haploxerand) subjected to four techniques for managing crop residues under zero tillage in wheat-oat rotation: 1) burned residues (t); 2) residues in rows (rh); 3) standing residues (rp); and 4) chopped residues (rpc). the evaluated variables were soil organic carbon (soc), aggregates stability measured by mean weight diameter (mwd), distribution of water stable aggregates, saturated water conductivity (ks), bulk density (da), and resistance to penetration (rp). the experimental design was complete random blocks and means were compared with the tukey test (p 0.25 mm), as well as a significant increase in soc (p%26lt;0.05). the treatment rpc had significantly lower values of ks (0.76 cm h-1), da and rp, which is favorable for sustainability of the soil structural system.