Soil samples (0 – 5 cm) were taken from a tropical topsoil at the premises of the University of Ngaoundéré, Ngaoundéré, Cameroon. A field experiment was installed in May 2018, with t0 sampling in December 2017 and in May 2018. Four treatments were implemented: A control receiving no amendment, a mineral control receiving NPK fertiliser (20-10-10), a compost treatment receiving a compost that was prepared from Tithonia diversifolia whole plants at an annual rate of 75 t/ha, and a combined biochar and compost treatment, where compost and biochar prepared from Tithonia diversifolia were co-composted (10 % v/v biochar) and applied at an annual biochar rate of 25 t/ha. Amendments were applied in June 2018 and 2019 to a depth of approximately 10 cm and Sorghum bicolor var. S35 was sown at 0.5 m distance within the rows and 0.5 m distance between the rows approximately two weeks after the amendment. The experimental design was a Latin Square with five field repetitions of each treatment, rendering a total of 20 plots of 2 x 2 m each. Soil samples were taken from the centre of each plot with a small shovel in December of 2017, 2018, and 2019 for dry season sampling, and in May of 2018 and 2019 right before amendment and in June of 2018 and 2019 right before sowing for rainy season sampling. In 2019, a total of four sampling campaigns was carried out in May and June due to additional mesofauna sampling. Samples taken in December 2018 and in December 2019 were dry sieved on site into four different aggregate sizes: 400 – 2000 µm; 200 – 400 µm; 50 – 200 µm; < 50 µm. C and N contents were obtained by grinding air-dried soil samples using a kitchen blender for homogenisation, and then measuring C and N by dry combustion. pH was measured by suspending 5 g of air-dried soil sample in 12.5 mL of either 0.01 M CaCl2 (pHCaCl2), demineralised water (pHH2O), or 1 M KCl (pHKCl). Samples were gently shaken for 2 h, allowed for sedimentation and pH was measured using a digital pH-meter. All measurements were conducted in duplicates. Due to limited sample availability, no pH values could be obtained for aggregate fractions < 400 µm. \nThe field experiment was part of the PhD dissertation project of Laura Sophie Schnee which was carried out in partnership between the Unviersities of Bremen, Germany, and Ngaoundéré, Cameroon.