热门课程排行

托福听力背景知识:牵牛花

发布时间:2013-05-03 14:39:49 来源:宁波朗阁培训中心 编辑:宁波朗阁小编
  为方便我们广大考生备考迎考,宁波新托福为大家搜集整理了托福听力背景知识:牵牛花,供大家参考使用,希望会对大家有所帮助。  牵牛...
  为方便我们广大考生备考迎考,宁波新托福为大家搜集整理了托福听力背景知识:牵牛花,供大家参考使用,希望会对大家有所帮助。
  牵牛花生性强健,喜气候温和、光照充足、通风适度,对土壤适应性强,较耐干旱盐碱,不怕高温酷暑,属深根性植物,地栽土壤宜深厚。
  牵牛花别名喇叭花、牵牛、朝颜花。为旋花科牵牛属一年生蔓性缠绕草本花卉。蔓生茎细长,约3~4米,全株多密被短刚毛。叶互生,全缘或具叶裂。
  Annual herbs twining, whole plant densely white hair. The stem is backward pubescent and with backward or spreading hirsute. Ye Kuan ovate or suborbicular, 3 - lobed deep or shallow, even 5 crack, long 4 ~ 15 cm, width 4.5 ~ 14 cm, base rounded, heart-shaped, in oblong or oval, acuminate or cuspidate, lateral lobes triangular, short, a sharp or round, leaf or sparsely or densely micro hard pilose; petiole is long 2 ~ 15 cm, indumentum same stem. Flowers axillary, usually single or 2 flower was born in the peduncle, peduncle length, length 1.5 ~ 18.5 cm, usually shorter than petiole, sometimes longer, indumentum same stems; bracts linear or leaflike, is the micro bristles; pedicels ca. 2 mm to 7 mm; bracteoles linear; sepals nearly as long, length 2 ~ 2.5 cm, lanceolate to linear, the inner surfaces of the 2 slightly narrower, outside was carried out base setose, more densely, sometimes mixed with pubescent; corolla funnelform, length 5 ~ 8 cm (10), blue purple or purplish red, corolla tube pale; stamens and style included; stamens unequal; filaments basally puberulent; ovary glabrous, stigma capitate. Capsule subglobose, diameter 0.8 ~ 1.3 cm, 3 - valved. Seeds ovoid, three - angled, ca. 6 mm, dark brown or beige, brown velutinous. Florescence 6 to in September, fruit period from 7 to October.
  牵牛花不仅是篱垣栅架垂直绿化的良好材料,也适宜盆栽观赏,摆设庭院阳台,盆栽宜在4月初,用普通培养土与素面沙土各半,装二号筒盆(内径13厘米),每盆点播4~5粒种子。因种皮较厚,发芽慢,可在种脐上部,用小刀刻破一点种皮。播种后保持25℃,7天左右发芽。
  Morning glory is not only a good material fence gate frame vertical greening, but also suitable for potted ornamental garden balcony, display, potted appropriate in the early 4, by ordinary culture soil and sandy soil were plain, two horn basin (13 cm in diameter), every 4 ~ 5 seed dibbling. Seed germination is thick, slow, in the upper part of the hilum, carved with a knife to break a little seed coat. Maintaining 25 ℃ after sowing, germination of 7 days. Observation two cotyledons long usually divided transplanting, the whole lump off pots to separate small seedlings with soil. Potted plants will root out when the lower 1 cm, by ordinary culture soil planted in two at the basin, every one, pay attention to outdoor transplanting Petunia, never a bruising primary root, transplanting should be small, round, the better the soil.
  对于好的牵牛花品种一定要留好种子,待入秋成熟后取种分类标注保存。如出现变种,更应加意留存。牵牛花的杂交在选好母本和父本后,在开花的前一天黄昏将花苞上端剪去,然后除去雄蕊,用蜡纸袋包扎。第二天清晨取下蜡纸袋,用父本的雄蕊进行人工授粉,然后再用蜡纸袋包扎,一二周后可除去蜡纸袋,但授粉的子包一定要作好标记,作好记录。翌年要把所杂交的全部种子种好,待开花后看成果,由之可以研究各种遗传因子的作用。
扩展阅读:托福听力练习的常用方法    托福听力背景知识:犀牛
  以上就是宁波新托福培训小编为大家搜集整理的托福听力背景知识:牵牛花,想了解更多学习知识和技巧,欢迎您关注我们。最后,宁波教育预祝考生们考出好成绩!
朗阁出国语言微信

朗阁小秘书微博
课程预约
  • 姓名:

    性别:

  • 电话:

    E-mail:

  • 计划学习时间: 1-3月 4-6月 下半年 寒暑假 还没有明确计划
  • 英语程度: 初高中 四六级 六级以上
  • 课程内容:
热门中心地址