Data with "Can organic amendments override environmental filtering of soil microbiomes? Evidence from 20 years old agricultural field trials in contrasting tropical sites"

This dataset contains soil physicochemical properties and functional gene abundances (qPCR) from four long-term organic amendment field trial sites in Kenya (Aludeka, Embu, Machanga, Sidada), collected in 2021. Variables include ammonium, nitrate, bulk density, total organic carbon, total nitrogen, C:N ratio, soil texture (clay/silt/sand), pH, and copy numbers for seven functional genes (16S, AOA, AOB, nifH, nirK, nirS, nosZI). Samples span four organic amendment treatments (CT, FYM, MS, TD) crossed with two nitrogen input levels (+N, −N), replicated across all sites. Amplicon sequencing data (16S rRNA and ITS) generated from the same samples are deposited at the European Nucleotide Archive under accession PRJEB103795, following standard open-access practice for sequence data. Supporting data for: Visscher AM, Ndungu SM, Feola Conz R, Laub M, Mucheru-Muna MW, Mugendi D, Yegon R, Rasche F, Waswa W, Pulleman M, Vanlauwe B, Six J, Hartmann M. "Can organic amendments override environmental filtering of soil microbiomes? Evidence from 20-year agricultural field trials in contrasting tropical sites" submitted to global change biology