What question did this study set out to answer?

The study aims to investigate how different initial moisture levels affect microbial processes and nutrient dynamics during composting of corn straw and cow manure.

May 3, 2026Open Access

Optimized Initial Moisture Content Enhances Microbial Biomass and Nutrient Cycling During Aerobic Composting of Corn Straw and Cow Manure

PGPhilip GhanneyUniversity of Cape Coast DADominic Kwadwo AnningGansu Agricultural University RDRichard DormateyCouncil for Scientific and Industrial Research

Puntos clave

The study aims to investigate how different initial moisture levels affect microbial processes and nutrient dynamics during composting of corn straw and cow manure.
Assess effects of 45%, 55%, and 65% initial moisture content in a bioreactor during winter composting.
Measure microbial biomass carbon, nitrogen, dissolved organic nitrogen, and total phosphorus levels.
Monitor temperature changes and moisture loss over the composting process.
65% MC showed the highest microbial biomass carbon (254.81 mg/kg) and nitrogen (26.38 mg/kg).
Dissolved organic nitrogen was highest at 21.2 mg/g for 65% MC, with significant increases over lower moisture contents.
Total phosphorus increased by 35.2% for the 65% MC treatment compared to baseline values.

Resumen

Abstract Optimizing the initial moisture content during composting is an important phenomenon for promoting microbial processes and nutrient dynamics in compost. Therefore, a study was carried out at Gansu Agricultural University, China (36°02′N, 104°25′E; 2400 m a.s.l.) to assess how an initially optimized moisture content (45% MC = MC 1 , 55% MC = MC 2 and 65% MC = MC 3 ) affects the decomposition of corn straw and cow manure mixture in a bioreactor system during winter. The results obtained show that all treatments, except MC 1 , entered the thermophilic phase (>50 °C) on day 3, with peak temperatures observed on day 7 for 55% MC (57.8 °C), day 9 for 45% MC (51.5 °C), and day 11 for 65% MC (56.7 °C). Despite the initial differences in moisture, the electrical conductivity (EC) values stabilized in the final phase of composting and were between 2.96 and 3.01 mS/cm for all treatments. The 65% MC outperformed the other treatments in microbial metrics. It had the highest microbial biomass carbon (MBC =254.81 mg/kg) and nitrogen (MBN = 26.38 mg/kg), corresponding to 6.7% and 6.9% increases over the 55% MC, and 14.8% and 26.4% over the 45% MC, respectively. The dissolved organic nitrogen (DON) content followed the trend 21.2 mg/g (MC 3 ) > 19.6 mg/g (MC 2 ) > 14.4 mg/g (MC 1 ), with MC 3 showing an increase of 47.2% and 8.2% over the MC 1 and MC 2 , respectively. The total phosphorus (TP) content increased by 14.9%, 27.4%, and 35.2% for 45% MC, 55% MC, and 65% MC, respectively, compared to the baseline values. The extent of moisture loss was inversely proportional to the initial moisture content, with MC 1 (44%) showing the highest losses, while MC 3 showed the lowest (23.4%). These results suggest that optimizing the initial moisture content of corn straw and cow manure mixture to 65% significantly improved the stimulation of microbial biomass, nutrient retention and overall quality of the compost.

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