A variabilidade granulométrica determina a distribuição de carbono orgânico e atributos físicos do solo em semeadura direta
DOI:
https://doi.org/10.26848/rbgf.v18.3.p1904-1916Keywords:
Textura, agregação, índice de estabilidade de agregados, geoestatística, fracionamento da areiaAbstract
Soil granulometry, which represents the quantitative distribution of solid mineral particles, controls most physical, chemical and biological processes in soils, and presents high spatial heterogeneity. Thus, the objective was to evaluate the variability of granulometry in the distribution of physical attributes and soil organic carbon, in no-tillage. The work was carried out on a commercial farm, located in Ponta Porã/MS, cultivated under direct seeding. Data were collected using a sampling grid, with 73 points, with 1 sample every 1.7 ha. Soil attributes sand, clay, silt, fractionated sand, macro and microaggregation, weighted average diameter, aggregate stability index and organic carbon were evaluated. Data were analyzed using descriptive and geostatistical statistics, and variability maps were prepared using the kriging interpolator. The granulometric variability interfered in the distribution of macro and microaggregates, weighted average diameter, aggregate stability index and soil organic carbon. The no-till system was efficient in maintaining the soil structure, however, it did not ensure adequate levels of organic carbon.
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