Maize growth as a function of cover crop-mediated soil microbiome

Area of Science:

• Agricultural Science
• Microbiology
• Soil Science

Background:

• Soil microbes are crucial for maize growth, soil fertility, and disease suppression.
• Understanding their role in diverse soils, especially with cover crops, is vital for sustainable agriculture and soil ecological engineering.

Purpose of the Study:

• To investigate the contribution of soil microbes to maize growth across varied Chinese soils.
• To assess the impact of legume and gramineae cover crops on soil microbial functions and maize yield.

Main Methods:

• Collected 27 soils from different regions of China.
• Conducted controlled experiments with legume and gramineae cover crops.
• Analyzed the correlation between soil microbial taxa and maize biomass.

Main Results:

• Soil microbes explained up to 29% of the variation in maize biomass.
• Key taxa like Geodermatophilus, Lapillicoccus, and Acidipila bacteria positively correlated with maize growth.
• Gramineae cover crops reduced soil nitrogen and maize growth, while legume cover crops reduced nitrogen without impairing growth.

Conclusions:

• Soil microbial communities play a fundamental role in maize growth across diverse environments.
• Agricultural practices, such as cover cropping, can steer microbiome-mediated soil functions.
• This research is critical for predicting food security in a changing world.