Fig. 1 Grain yield responses (yield at 51 cm–yield at 102 cm row spacing) of semidwarf (open symbols) and standard-height (closed symbols) cowpea lines as affected by vegetative responses (vegetative biomass at 51 cm–vegetative biomass at 102 cm row spacing). Data are from four environments. R = Riverside, S = Shafter; 8 = 1998, 9 = 1999. The solid linear regression line has an r² of 0.99

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