Fig. 4.
Cumulative grain yields (a), glucose equivalent yields (b) and protein yields (c), in different crop sequences in a Mollisol and a Vertisol at Paraná, Argentina (31°51′ S; 60°32′ W). Different letters on the bars indicate significant differences between cropping sequences within a soil type according to LSD test (α=0.05). Uppercase indicate differences in the Mollisol, whereas lowercase indicate differences in the Vertisol. S-S: soybean monoculture; S-M: soybean-maize; CC/S-M: wheat cover crop/soybean-maize; W/S-M: wheat/soybean-maize; CC/S-CC/S: wheat cover crop/soybean; W/S-W/S: wheat/soybean. In the abbreviation of cropping sequences, hyphens separate years, whereas slashes separate crops within the same year.