Fig. 3. Percentage of the plant population in each treatment block that has begun to shed pollen (Beg Shed), is at maximum pollen shed (Max Shed), has completed pollen shed (End Shed), or has silks visible (Silking). MF indicates percentage of plants allowed to shed pollen. The level of male fertility was controlled by detasselling (P3978), or by using a male sterile isoline (P3925). Data are the mean ± SE of 4 reps of 20 to 40 plants each.