Agricultural practices that enhance soil structure improve crop yields of Swedish farms

Summary

This observational study of 67 Swedish farmer fields examined relationships between agricultural practices, soil health indicators, and crop yields. Basal respiration emerged as the most sensitive soil health indicator, positively associated with higher crop diversity, frequent organic fertilizer use, reduced fungicide application, and lower tillage intensity. In high-yielding 'good' fields, yield was associated with enhanced soil structure (higher aggregate stability and SOM, lower bulk density), whilst in lower-yielding 'poor' fields, higher yields correlated with increased pesticide use, suggesting management of pest and disease pressure rather than inherent soil quality.

UK applicability

The findings on reduced tillage benefits to soil structure and organic matter accumulation are likely applicable to UK arable systems with similar climatic and soil conditions. However, the study's temperate Swedish context and focus on conventional/integrated farming systems means direct transfer should account for regional variations in soil types, climate, and crop rotations typical of UK cereal production.

Key measures

Soil health indicators: plant available water capacity, penetration resistance, wet aggregate stability, bulk density, cation exchange capacity, pH, soil organic matter content (SOM), basal respiration; agricultural management practices: tillage intensity, crop rotation, organic fertilizer application, pesticide and fungicide use; crop yields over five-year period

Outcomes reported

The study measured soil health indicators (plant available water capacity, penetration resistance, wet aggregate stability, bulk density, cation exchange capacity, pH, soil organic matter content, basal respiration) and their relationships with five-year agricultural management practices and crop yields across 67 farmer fields. Researchers compared paired 'good' fields (high/stable yield) with contrasting 'poor' fields to identify which soil health factors and practices explained yield differences.

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