Optimized decomposition of fresh tomato remnants in facility soil

Area of Science:

• Agricultural Science
• Soil Science
• Environmental Science

Background:

• Returning vegetable remnants to soil is crucial for nutrient cycling and soil health.
• Understanding decomposition efficiency parameters is key for effective in situ soil amendment.

Purpose of the Study:

• To evaluate the impact of tomato remnant length, soil moisture, soil temperature, and microbial decomposer (MD) dosage on decomposition efficiency.
• To identify optimal conditions for maximizing the decomposition rate and organic carbon breakdown of tomato residues.

Main Methods:

• Laboratory experiment utilizing nylon mesh bags to contain tomato remnants.
• Systematic variation of remnant length (∼0.5 cm and ∼2.5 cm), soil moisture content, soil temperature, and microbial decomposer (MD) dosage.
• Quantification of residual remnant weight, total carbon content, decay rate, and organic carbon breakdown rate.

Main Results:

• Shorter remnant length (∼0.5 cm) increased residual weight and carbon content but decreased decomposition rates.
• Soil moisture exhibited a non-linear effect; optimal decay and breakdown rates were observed at specific moisture levels (e.g., 80% and 60%).
• Increased microbial decomposer (MD) dosage and moderate soil temperatures (around 45°C) significantly enhanced decomposition and carbon breakdown rates.

Conclusions:

• Decomposition rate is significantly influenced by remnant length and MD dosage.
• Organic carbon breakdown rate is associated with all four evaluated parameters: remnant length, soil moisture, soil temperature, and MD dosage.
• Optimal decomposition efficiency is achieved with ∼0.5 cm remnant length, 89% soil moisture, 50°C soil temperature, and 7% MD dosage.