2.3.4. Data analysis
Statistical analyses were performed with SAS 9.2 (SAS Institute
Inc., Cary, NC, USA). The GLM procedure (with Random statement)
was used for analysis of variance of the mixed model. Means were
compared according to the least significant difference (LSD) with
Fisher’s LSD test with a probability level of 0.05. Combined analysis across seasons was performed for yield, yield components,
biomass accumulation and N uptake. For biomass accumulation
and N uptake, combined analysis across seasons was performed
only across the two last seasons for the two first samples (P1 and
P2), and across the three seasons for the last samples.