保花肥对母本柱头外露及结实率的影响  

Effects of Spikelet-developing Fertilizer on Stigma Exsertion and Outcrossing of CMS lines in Hyhrid Rice Seed Production

作　　者：邓秋生 

机构地区：[1]湖南省衡东县种子公司

出　　处：《杂交水稻》1995年第1期13-14,37,共3页Hybrid Rice

摘　　要：Ｖ２０Ａ在幼穗发育５～６期亩施尿素５～６ｋｇ和钾肥３～５ｋｇ作保花肥，可提高母本柱头外露率１５％左右，可使异交结实率提高１０．８％～１７％。产量增加１０％以上。In hybrid rice seed production(of V20A× 1126), different amount of urea and potash fertilizerwas applied in the young panicle differentiation stages from the formation of pollen mother cells (Stage Ⅴ ) tomeiotic division(Stage Ⅵ ) as the spikelet--developing fertilizer on the female parent to study the effects onstigma exsertion and outcrossing in CMS lines; The experimental results showed that applying urea 75～90kg/ha and potash fertilizer 45～ 75 kg/ha could increase the rates of stigma exsertion and outcrossing of thefemale by about 15%and l0%, respectively, and raise the seed yield by 10%. The reason is thought to bethe longer, larger stigmas and stronger stigma vigor after the application of the spikelet-developing fertiliz-er.

关 键 词：V20A 柱头外露率 异交结实率 保花肥 杂交水稻 

分 类 号：S511.103.5[农业科学—作物学]