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Elevated concentrations of manganese (Mn 2+ ) can persist after drainage in soil following wetland rice production, leading to toxicity in subsequent legume crops. To evaluate Mn 2+  concentration causing adverse impacts on crop establishment and growth, a controlled environment experiment using hydroponics was designed. Germination and growth of field pea, faba bean and mung bean were evaluated over 21 d with an increase in Mn 2+  (0 − 50 mg Mn 2+ L −1 ). Germination of all crops was impacted significantly with an increase in concentration of Mn 2+ . Leaf chlorophyll content as well as all plant growth parameters assessed (dry weight, height) were negatively impacted ( p  &lt;  0.05) by increasing concentrations of Mn 2+ . Field peas and faba beans proved more sensitive to Mn 2+  than did mung beans at concentrations of 5 − 10 mg L −1 . Field pea and faba bean specifically exhibited reduced height (30 − 60% and 4 − 41%, respectively), root length (12 − 30% and 20 − 25%, respectively), and shoot weight (41 − 69% and 47 − 81%, respectively). Mung bean was less impacted in terms of plant height with 23% reduction at 25 mg Mn 2+  L −1  and shoot dry weight reduced by 48% at 50 mg Mn 2+  L −1 . Total chlorophyll content of mung bean was severely affected (86% reduction at 50 mg Mn 2+  L −1 ), with field pea least impacted. Our findings suggest that significant Mn 2+  toxicity could potentially occur in terms of legume germination and overall growth if legume crops are sown into post-rice soils with ≥5 mg Mn 2+ L −1 . Soil Mn 2+  level must be considered when developing cropping strategies following flooded rice.

What levels of soil Mn 2+ can pulse and legume crops tolerate when grown in rotation with paddy rice?