Periódicos Brasileiros em Medicina Veterinária e Zootecnia

p. 3053-3072

Carbon stock, chemical and physical properties of soils under management systems with different deployment times in western region of Paraná, Brazil

Sérgio Rosset, Jeando Carmo Lana, MariaGervasio Pereira, MarcosAntonio Schiavo, JolimarRampim, LeandroVinicius Mansano Sarto, MarcosPereira Seidel, Edleusa

The objective of this study was evaluate the organic carbon stock and chemical and physical properties of soils in management systems with different deployment times under clayey Red Latosol in western region of Paraná, Brazil. Five managed areas and a reference area (native forest) without anthropic action were analyzed in completely randomized design with five repetitions. Management systems include three areas with different time of first adoption of no-till: 6 years NT6 (transition phase), 14 years NT14 (consolidation phase) and 22 years NT22 (maintenance phase); 16 years of no-till, and in the last four years with integration of maize and ruzigrass (Brachiaria ruziziensis) (NT+B) and an area of permanent and continuous extensive cattle pasture of coast-cross (Cynodon dactylon) (P). Physical and chemical properties, total soil organic carbon (TOC) stock and carbon stratification index (SI) of soils were evaluated in depths of 0-0.05; 0.05-0.10; 0.10-0.20 and 0.20-0.40 m. The macroporosity (MA) was higher in the area of native forest, ranging from 0.23 to 0.30 m3 m-3 and the microporosity (MI) was higher in cultivated areas. The areas of NT+B and P presented lower ratio macroporosity/total pore volume (MA/TPV). For soil bulk density (BD) and soil penetration resistance (SPR), the managed areas show higher values, suggesting the occurrence of compacted subsurface la

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