郁金香为何茎短花小?
家庭栽培的郁金香,通常表现为茎短花小,质量不如花市上出售的好,其主要原因:一是遗传基础不同的品种,其花茎的长短、花径的大小差异较大。二是连续2~3年栽培使品种退化。
由于栽培环境与郁金香原产地的生态条件差异较大,特别是夏季气温偏高、生长期施肥不合理等因素,均易使种球退化,一般商品种球在没有采取相应的复壮措施的情况下,只能栽种1~2年。三是种球贮藏时的温度过高,造成内部营养的大量消耗,花芽分化又没有与之相适应的温、湿度(即凉爽干燥)条件,这是造成郁金香茎短花小的最根本原因。
而市售的盆栽郁金香,多用一次性商品种球,均为大个头、养分积蓄充分的硕大鳞茎,加之水肥管理得当,必然是叶茂、莛高、花大。郁金香原产伊朗和土耳其等高山地带,属于地中海气候型花卉,适应于冬季湿冷、夏季凉爽和稍干燥的生态环境。它夏季休眠,秋冬季生根并萌发新芽,但不出土,需经冬季低温,到了第二年2月的气温达5~20℃时才生长出土;种球贮藏期间的花芽分化适温为20~25℃,最高不得超过28℃;根系受伤后不能再生,因此郁金香植株忌移栽。家庭盆栽可在9月下旬或10月上旬进行。盆栽宜选用矮型品种,可用深筒盆,以利于其根系的生长发育。
盆土可用腐叶土7份、沙2份、腐熟饼肥或厩肥1份,均匀混合后配制。栽种前,先将鳞茎外面的一层褐色膜质表皮撕去,再用0.1%的多菌灵或代森锌液消毒后,方可种植入盆。一般一个口径20厘米(6寸)的花盆,可栽种直径3厘米以上的商品种球2~3个。然后浇透水,将其置于光照充足处,盆土干后即浇水,但不可过多,以防盆土过湿而导致种球腐烂。上冻前移人冷室内,室温保持在0℃以上。早春2~3月即可抽芽出土,再将其搬到室外阳光下,每隔10天追施一次稀薄的饼肥水;孕蕾到开花前,追施1~2次速效磷钾肥,如0.3%的磷酸二氢钾溶液,不仅有利于花朵的孕育开放,而且对种球留种至关重要;
生长期内始终保护盆土湿润状态,4月即可开花。如果是为了促成其在元旦或春节期间开花,可将盆栽商品种球置于室外冷凉处,盆土保持不干不湿,直到计划观花期前1~2个月,再将其移到5~7℃的温度条件下,如塑料棚中,出叶后改移至气温15~18℃且光线充足处,增施水肥,即可如期开花。对准备保留种球的植株,可在花苞尚未开放前及早连花莛一并摘去,然后每隔半月追施~次磷钾肥.这样不仅可减少植株的养分消耗,还可促成子球长得大而多,使其符合种球的标准。待到其茎叶开始枯黄,停止浇水施肥;
茎叶约有1/2枯黄时,即可挖出鳞茎,稍加摊晾后,可用0.1%的高锰酸钾或0.1%多菌灵消毒20分钟,稍晾后再将其摊放在箩筐中,搁放于干燥凉爽处贮藏。贮藏期间应维持不高于20℃的室温,经常检查并剔除带病的鳞茎予以销毁。到了9月初贮藏的鳞茎便可完成花芽分化,这时可转入冷室中进行低温处理,前一阶段可维持9℃,后一个月转入5℃,共处理60~80天,才能保证其可正常开花。经过低温处理的鳞茎,适时进行促成栽培,从栽种到开花一般只要50~60天时间。
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