WHAT THE EVIDENCE SAYS
A three-year survey of 65 healthy/declining field-patch pairs found lower boron in some deficient patches and associations involving sulphur, iron, organic matter and nutrient ratios. Oversupply as well as deficiencies coincided with decline in some cases.
WHY IT MATTERS / OUR READ
Investigate paired soil chemistry, compaction, moisture and plant pathogens before automatically treating weak stands with fertilizer.
CAVEATS / UNCERTAINTY
Observational associations are not randomized fertilization trials; severity and causation may vary among clover and lucerne sites.
SOURCE
Journal of Soil Science and Plant Nutrition — Steinfurth et al. (2026)
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