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为延长垦粘１号和垦粘３ 号玉米青食采穗期，进行了分期播种试验。通过提前、延后分期播种，增加了播种次数，比常规播种的青食采穗期延长５３～５５ｄ，经济效益大幅度提高
In order to extend the heading date of Kenyou 1 and Kenyou 3, the sowing experiment was conducted in stages. Through advance and delayed staging, the number of sowing was increased, which was 53-55 days longer than that of the conventional sowing of green food and the economic benefit was greatly increased