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Abstract
Abstract: The objective of this work was to evaluate the effect of different amounts of black oat (Avena strigosa) straw covering soil surface on soil temperature at different depths. The treatments consisted of 0, 3, 6, and 9 Mg ha-1 straw. Soil temperature was measured hourly by a thermocouple inserted at different depths (0, 5, 15, 30, and 50 cm) and was used to adjust an equation correlating the temperature of covered soil with that of bare soil. With the correlations, it was possible to observe a point value of temperature (inversion temperature of straw effect), below which the presence of straw acts positively on the maintenance of soil temperature and above which the presence of straw acts negatively on soil heating.
Highlights
Resumo – O objetivo deste trabalho foi avaliar o efeito de diferentes quantidades de palha de aveia-preta (Avena strigosa) em cobertura do solo sobre a temperatura do solo em diferentes profundidades
In Brazil, 32 million hectares (FEBRAPDP, 2012) are planted under this direct-seeding system, for which soil cover by crop residues is recommended
Ts of soil covered by straw may remain higher than that of bare soil at night or during periods of Ts depletion (Silva et al, 2006; Chen et al, 2007)
Summary
Resumo – O objetivo deste trabalho foi avaliar o efeito de diferentes quantidades de palha de aveia-preta (Avena strigosa) em cobertura do solo sobre a temperatura do solo em diferentes profundidades. The presence of straw cover affects soil temperature (Ts), which is attributed to the changes in the albedo surface and to the lower thermal conductivity of the straw layer compared with that of the soil. The objective of this work was to evaluate the effect of different amounts of black oat straw covering soil surface on soil temperature at different depths.
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