Plants were sown on Wednesdays in Neuhaus S soil in which poudzolane was added (2L/70L). Standard fertilization solution containing nitrogen source (75% /25% ; 40 mg/L) was supplied every Monday for 3 weeks. Twenty six days after sowing, we supplied on Monday either a fertilization solution containing a nitrogen source (1N condition: 50% NH4+/50% NO3−; 40 mg/L), or the same solution without nitrogen source and corresponding to the 0N condition. This fourth fertilization was done 1 day before inoculation.
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