Choose a plot with suitable climate and environmental conditions, uniform soil, consistent fertility, and no millet in the previous crop. Plant 400 mixed seeds in 2 replicates of 200 seeds each. Single grain sowing on demand, row spacing 30cm, plant spacing 30cm. Field management methods follow the requirements for fine management of ordinary field millet production. Record the total number of plants and the number of hybrid plants, and calculate the hybrid ratio according to formula (1).