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In a glasshouse experiment, plants of Pisum sativum L. cv. Argona were grown hydroponically with different B and Ca levels, in order to elucidate a specific role for B and Ca on the N 2 fixation in this temperate legume. The treatments were as follows: control (9.3 μM B and 2 mM Ca), -B (without B and 2 mM Ca), -B+Ca (without B and 3.6 mM Ca), +Ca (9.3 μM B and 3.6 mM Ca), -Ca (9.3 μM B and...
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