Fig. 5

Lignin content in signal grass pasture roots under different cropping systems, in periods 1 (a) and 2 (b), throughout the incubation times. Vertical bars indicate the mean standard error (U0, unfertilized signal grass; U50, signal grass fertilized with 50 kg ha−1 N; U100, signal grass fertilized with 100 kg ha−1 N; UC, signal grass intercropped with calopo).