Effects of spatial variability on soil physical attributes in areas cultivated with cassava prepared with different tillage systems

  • Edney Leandro da Vitória UNIVERSIDADE FEDERAL DO ESPÍRITO SANTO
  • Adriano Alves Fernandes UNIVERSIDADE FEDERAL DO ESPÍRITO SANTO
Keywords: geostatistics, Manihot esculenta Crantz, tillage systems, soil physical properties

Abstract

The objective of this study was to understand the effect of the spatial variability of the soil physical attributes in areas cultivated with cassava with different soil tillage systems, using the techniques of classical statistics and geostatistics. The experiment was carried in 2013 in São Mateus - ES, Brazil, on a cohesive ultisol, with a plan relief. The preparation of the soil for transplanting were made in two adjacent areas of approximately 0.5 ha each, using up to two passes of a harrow disk or two passes of a chisel plow. The following soil physical attributes were studied 90 days after transplanting: soil density (DS), macroporosity (Macro) and microporosity (Micro), soil water content according to two preparations systems and two depth ranges. Eighty plants were randomly selected to perform the experiment. The soil physical properties resulted in spatial variability due to the strong dependence for all variables, tillage system and soil depth. The semivariograms were adjusted to the spherical and exponential models for the evaluated physical attributes. Except for water content, it was observed an increase in the range (A0) with increasing depth for both tillage systems. The soil water content presented a decrease about 23% for the harrowing and scarification systems.

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Author Biographies

Edney Leandro da Vitória, UNIVERSIDADE FEDERAL DO ESPÍRITO SANTO
Graduado em Engenharia Agrícola pela Universidade Federal de Viçosa (1997), Mestrado em Engenharia Agrícola pela Universidade Federal de Viçosa (1999) e Doutorado em Engenharia Agrícola pela Universidade Federal de Viçosa (2010). Atualmente é professor de dedicação exclusiva da Universidade Federal do Espírito Santo, Campus São Mateus. No ensino atua como professor das disciplinas de Mecânica, Motores e Máquinas Agrícolas para a graduação em Agronomia e a disciplina de Tecnologia de Aplicação de Defensivos Agrícolas no Programa de Pós-Graduação em Agricultura Tropical. Atual Diretor da Fazenda Experimental CEUNES/UFES. Desenvolve pesquisas na graduação e pós-graduação. Consultor Add hoc das revistas: CERES, Engenharia na Agricultura, Engenharia Agrícola e Semina. Tem experiência na área de Engenharia Agrícola, com ênfase em Mecanização Agrícola, atuando principalmente nos seguintes temas: Máquinas e Implementos agrícolas, Geoestatística, Energia na Agricultura e Tecnologia de Aplicação de Defensivos.
Adriano Alves Fernandes, UNIVERSIDADE FEDERAL DO ESPÍRITO SANTO
Professor Adjunto da Departamento de Ciências Agrárias e Biológicas (CEUNES/DCAB/UFES)
Published
01-02-2018
How to Cite
da Vitória, E. L., & Fernandes, A. A. (2018). Effects of spatial variability on soil physical attributes in areas cultivated with cassava prepared with different tillage systems. Comunicata Scientiae, 8(2), 221-229. https://doi.org/10.14295/cs.v8i2.1030
Section
Original Article