Tillering and earbearing characteristics of wheat varit ies “ miannong 4 " and “ miannon 3 " were studied under three densities . the results indicated that t he two varieties had medium tillering speeds and tillering numbers ， and their t illering number under medium density was 3 . 7 tillers per plant ， which is less th a n that of “ mianyang 11 " ， a popular wheat variety in sichuan in 1980s . their perc en tage of earbearing was about 55 % ， which is also lower than that of “ mianyang 11 " 在3种密度下对绵农4号、绵农3号的分蘖及成穗特性进行了初步研究，结果表明：绵农4号、绵农3号的分蘖速度和分蘖力皆为中等，中等密度条件下，有效分蘖期每天可形成0 . 15蘖，各期总蘖数为3 . 7左右，低于绵阳11号；与绵阳11号分蘖速度的差异主要在有效分蘖期；绵农4号、绵农3号的成穗率为55 %左右，低于绵阳11号；但分蘖和主穗的差异较小，分蘖穗重占主穗重的80 %左右，茎蘖穗重变异系数15 %左右，穗子大小均匀一致，小穗相对较少，小穗较大，这些性状都优于绵阳11号。
