独家报道：解答牵牛花的“不长个，先开花”
<p>我很喜欢牵牛花，但它属缠绕草本，得长好长的秧子才能开花，在宿舍种很不方便。有没有办法让它不爬藤，在很矮的时候就能开花？还有好多网友说：自己的牵牛“不长个，先开花”，这是为什么呢？听我慢慢解释：</p><p><font face="宋体"><strong> 牵牛花， </strong><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'MS UI Gothic'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><strong><em>Pharbitis nil，</em></strong>俗名喇叭花，裂叶牵牛，朝颜，一年生缠绕草本，属典型的短日照花卉。</span></font></p><p><font face="宋体"><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'MS UI Gothic'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"> 问题的答案就在这。如果牵牛花萌发后，接受长时间的短日照，就会产生花芽分化。牵牛的子叶能感受光周期，在短日照条件下，子叶的叶腋处都会分化出花来，每个真叶的叶腋处都会有一朵花，这就是“不长个先开花“的原因。</span></font></p><p><font face="宋体"><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'MS UI Gothic'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"> 1）<strong>想让牵牛爬藤的花友们注意拉：</strong> 冬季，春初，秋季播种牵牛花，如果每天光照时间短于9小时，牵牛花幼苗就能感受到短日照，产生花芽分化。造成”不长个先开花“，幼苗养分制造能力弱，一旦开花，生长速度明显下降，不会产生很好的爬藤效果</span></font></p><p><font face="宋体"><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'MS UI Gothic'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"> 2）<strong>想让牵牛不爬藤就开花的注意拉：</strong>如上所述，冬季，春初，秋季播种，接受短日照就能在幼苗期开花，而且叶芽转化成了花芽，一叶一花，花大色艳。茎少有分支。待花谢后，摘除残花，在残花叶腋处会萌发出叶芽，形成分支。</span></font></p><p><font face="宋体"><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'MS UI Gothic'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"> <strong> 夏天是长日照，怎么能使它不爬藤就开花？</strong></span></font></p><p><font face="宋体"><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'MS UI Gothic'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><strong> </strong> 1。整形：种子萌发，长出5--6片真叶时摘心，留底部两个健壮的侧蔓，其余摘除。待侧蔓真叶长出4--5片叶时摘心，留底部两个健壮侧蔓，如此3-4次。牵牛花就有了既矮化又丰满的株型。</span></font></p><p><font face="宋体"><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'MS UI Gothic'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"> 2。短日处理：每天用黑色塑料袋给于人为遮光，使每天的光照时间短于9小时，直至牵牛出现花芽然后去掉塑料袋。 方法：取质地较厚的不透光的黑色塑料袋2个，在上面扎上黄豆粒</span></font>大小的通气口10个，然后依次套在牵牛的花盆上，两个袋子的通风口要错开，将袋口扎紧，放在避光处（墙角，床底等）。 注意：每天必须给予短于9小时的光照，光照时摘除塑料袋，将牵牛摆在阳光直射处。</p><p> <strong>大家看看我的牵牛花吧，春初播种，</strong></p><p><img src="attachments/dvbbs/2007-5/20075248135888598.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2007-5/20075248135888598.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><br/><img src="attachments/dvbbs/2007-5/20075248141040324.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2007-5/20075248141040324.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><br/></p>