TY - DATA T1 - Hourly, Daily, and Monthly Soil Temperature Fluctuations in a Drought Tolerant Crop PY - 2018/01/24 AU - Polianna dos Santos de Farias AU - Luciano da Silva Souza AU - Arlicélio de Queiroz Paiva AU - Áureo Silva de Oliveira AU - Laércio Duarte Souza AU - Carlos Alberto da Silva Ledo UR - https://scielo.figshare.com/articles/dataset/Hourly_Daily_and_Monthly_Soil_Temperature_Fluctuations_in_a_Drought_Tolerant_Crop/5816490 DO - 10.6084/m9.figshare.5816490.v1 L4 - https://ndownloader.figshare.com/files/10286796 L4 - https://ndownloader.figshare.com/files/10286805 L4 - https://ndownloader.figshare.com/files/10286811 L4 - https://ndownloader.figshare.com/files/10286820 L4 - https://ndownloader.figshare.com/files/10286823 L4 - https://ndownloader.figshare.com/files/10286829 L4 - https://ndownloader.figshare.com/files/10286838 L4 - https://ndownloader.figshare.com/files/10286847 L4 - https://ndownloader.figshare.com/files/10286856 L4 - https://ndownloader.figshare.com/files/10286865 L4 - https://ndownloader.figshare.com/files/10286874 L4 - https://ndownloader.figshare.com/files/10286883 KW - semiarid region KW - Cambisol KW - Inceptisol KW - soil thermal diffusivity KW - soil temperature variability N2 - ABSTRACT Soil temperature is a physical property of great agricultural importance in the soil-plant relationship and in energy exchange with the atmosphere. This study was conducted in a degraded Cambissolo Háplico Ta Eutrófíco (Cambisol; Inceptisol) in the Irecê Identity Territory, Bahia, Brazil, aiming to evaluate the hourly, daily, and monthly fluctuations of soil temperature at depth, and soil thermal diffusivity in the castor bean crop. Hourly soil temperature data from February 4, 2014, to September 30, 2015, were obtained by using thermocouple sensors (copper-constantan) horizontally installed at 0.05, 0.10, and 0.20 m depths. Soil thermal diffusivity was estimated by phase and amplitude methods. Results showed that, for most days, the soil temperature was at the level recommended for castor bean. The maximum and minimum hourly and daily soil temperatures were observed in October and July, respectively, and the maximum soil temperature values occurred at 4 p.m. (0.05 m), 5 p.m. (0.10 m), and 7 p.m. (0.20 m). Soil temperature variability is low, requiring few measurement points to estimate this factor in an area. The amplitude method led to soil thermal diffusivity values compatible with results in the literature. The absence of a relationship between thermal diffusivity and soil moisture was attributed to the clay-loam soil texture, predominance of micropores, and iron oxides allowing greater approximation to the soil particles, with high thermal diffusivity even under low soil moisture conditions. ER -