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Five alternatives of the previously published MOMOS model (MOMOS‐2 to ‐6) are tested to predict the dynamics of carbon (C) and nitrogen (N) in soil during the decomposition of plant necromass. ¹⁴C and ¹⁵N labeled wheat straw was incubated over 2 years in fallow soils of the high Andean Paramo of Venezuela. The following data were collected: soil moisture, total ¹⁴C and ¹⁵N and microbial biomass (MB)‐¹⁴C and ‐¹⁵N, daily rainfall, air temperature and total radiation. Daily soil moisture was predicted using the SAHEL model. MOMOS‐2 to ‐4 (type 1 models) use kinetic constants and flow partitioning parameters. MOMOS‐2 can be simplified to MOMOS‐3 and further to MOMOS‐4, with no significant changes in the prediction accuracy and robustness for total‐¹⁴C and ‐¹⁵N as well as for MB‐¹⁴C and ‐¹⁵N. MOMOS‐5 (type 2 models) uses only kinetic constants: three MB‐inputs (from labile and stable plant …