Demand-Driven Technologies for Sustainable Maize ... - IITA

13Figure 7. Relationship between grain yield and its CV for RUVT-early,1987–2005.Figure 8. Relationship between grain yield and its CV for RUVT-extraearly, 1987–2005.Workshops, although 60–70% of the papers presented were technicalreports. Beginning from the 1995 Workshop, the proportion oftechnical papers increased to 80% or more.Similarly, from 1997 the proportion of NARS participants at theWorkshop increased to 73% or more, with a peak of 82% in 1999.Linear regression analysis showed a 9% increase in the proportionof technical papers per additional Workshop with an r 2 value of62.6%. Corresponding values for the proportion of NARS participantswere 5% and 90.0%. The quadratic analysis produced a better fi t(R 2 =81.8%) for the proportion of technical papers at the Workshop,with a negative quadratic b-value (b= -0.694); a refl ection of the peakobserved in 1999 (Fig. 6).For the two sets of RUVTs conducted by the Network, the CV hada curvilinear negative relationship with grain yield, with R 2 values ofabout 24–25% (Figs. 7 and 8), which were signifi cant at P