1防止混杂1.1隔离玉米杂交制种田空间隔离不小于300m,如果用时间隔离应不少于40d,以防止外来花粉引起生物学混杂。1.2去杂去劣玉米制种田间去杂去劣一般需要进行3次。第1次结合间苗、定苗根据父本、母本自交系的长相、叶色、叶形、叶鞘色和生长势等特征进行;第2次是在拔节期进一步严格去杂去劣;第3次在雄穗散粉前,按照自交系的典型性 1 to prevent confounding 1.1 isolated maize hybrid farming system of space isolation is not less than 300m, if the time of isolation should be not less than 40d, in order to prevent foreign pollen caused by biological hybrid. 1.2 Going to misogyny Corn farming to go to miscellaneous and inferior to the general need for 3 times. The first combination of Miaomiao, Dingmiao according to the male parent, female parent inbred line appearance, leaf color, leaf shape, leaf sheath color and growth potential and other characteristics; the second is further severe at jointing stage to miscellaneous and inferior; Article 3 Times in front of loose tassels, according to the typical inbred lines