为了保证杂交水稻制种时父母本花期相遇,使父本有充足的花粉供应母本,并做到“保前、遇中、顾尾”,提高母本受粉机率,夺取制种稳产高产,我们试验推广了改二期父本为三期父本制种的做法。这三期的作用分别为:一期开炮“保头”,二期搭桥“遇中”挑重担,三期“顾尾”把关。母 In order to ensure the parents of the hybrid rice seed flowering meet, so that the male parent has adequate supply of pollen mother, and to achieve “Pre-Bao, in the middle and tail” to improve the mother of the powder rate, to seize seed production of stable and high yield, we The experiment popularized the practice of changing the second period male parent into the third period male parent. The role of these three were: a shot “Paul header”, two bypass “encounter” heavy burden, three “Gu tail” check. mother