Research and practice of hybrid wheat seed production

Remarkable progress has been made in hybrid wheat in China.But hybrid wheat want go to farmer,the efficient seed production techniques must be developed.Hybrid wheat seed production techniques were studied.The stigma viabilities of female could last 15 days,being divided into four stages,such as the initial flowering stage,full flowering stage,late flowering stage and the end flowering stage.The optimum nick had been shown to be from +2 to +4 for CHA system and to be from +2 to +6 for CMS system.The best row ratio between male and female parents was 1∶2(1.6 m∶3.2 m).Some forms of artificial assitance for pollen had the obvious effects upon the seed set bearing percentage of poor nick.The techniques used for hybrid seed purity were reviewed in his paper.