Summary
This meta-analysis of published data demonstrates that straw return significantly increases maize yield in China by approximately 27%, with effects modulated by nitrogen fertilisation, climatic zone, and soil nutrient status. Structural equation modelling revealed that management practices and cropping systems are the primary positive drivers, whilst soil factors exert a negative direct effect (though mediated indirectly through climatic influences). The findings confirm straw return as a sustainable soil improvement practice, most effective in arid and semi-humid regions and in low-to-moderate nutrient soils.
Regional applicability
This study is specific to Chinese agro-ecological conditions and maize systems. Transferability to United Kingdom conditions is limited, as UK arable systems, soil types, climate zones, and nitrogen management practices differ substantially; however, the general principle that straw incorporation improves soil fertility and that its effectiveness depends on baseline soil nutrient status and concurrent management may be applicable to UK cereal production systems.
Key measures
Log response ratio of maize yield with versus without straw return; path coefficients from partial least squares structural equation modelling for cropping systems, management practices, soil factors, and climatic factors
Outcomes reported
The study quantified the overall effect of straw return on maize yield (26.75% increase) and identified major driving factors including nitrogen application, climatic conditions, soil nutrient status, cropping systems, and management practices using structural equation modelling.
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