Fig. 8. Grain yield and yield components for P3978 and P3925 grown at four levels of male fertility. The level of male fertility was controlled by detasselling (P3978), or by a mixture of male sterile and male fertile isolines (P3925). Fraction of plants shedding pollen is the target value for each treatment. Data from second ears are included in the analysis. Data are the mean ± SE of 4 replicate yield measurements of 40 to 80 plants each within each treatment block.