Reverse relationship between oil and protein concentrations as observed in 2012 field experiment (Andrianasolo, 2014). 2 genotypes (Kerbel, Olledy), 2 nitrogen conditions (N+: non-limiting; N-: limiting), 2 plant densities (D1: 3 plants per m²; D2: 4.5 plants per m²) were combined in irrigated plots. Datapoints represent mean values of genotype x nitrogen x plant density treatments at harvest.