香雪兰生长发育与矿质营养的吸收规律

对香雪兰(Freesia refracta Klatt)地上部、地下部的生长动态进行了试验研究，分析了各时期叶片和新球中N，P，K，Ca，Mg，Fe元素的吸收规律。结果表明，10月上旬栽植的香雪兰新球直径大小变化与干鲜重的变化规律基本一致，不同时期有不同的变化幅度。栽植后10～14周新球直径、干鲜重的增长较快，花期球茎干鲜重增长迅速，4月上旬到下旬球茎干鲜重及直径均达生长高峰。香雪兰地上部的生长高峰在生长发育的前期，地下部新球生长高峰出现在香雪兰花后。香雪兰生长期中N的含量最高，但N含量变化不大；对K的吸收大于对P的吸收，在新球充实生长后期。对P的需求量很大．4月上旬出现峰值。植株对Ca，Mg．Fe的吸收与地上部的生长发育有一定的联系。

Study on the Regularity of Development and Some Mineral Elements Absorption of Freesia refracta Klatt

The development patterns of the Freesia refracta Klatt,both above ground and underground,were analyzed,as well as the absorption regularity patterns of N,P,K,Ca,Mg and Fe in different periods.The results showed that the change regularity of new corm diameter size coincident with the change of fresh and dried weight,and how the changes varied in different periods.The new corm's diameter size,fresh and dried weight,increased fast during the 1014 weeks after planting,and the peak value appeared in the middle of April.The growth peak value of growth above ground emerged at the early stage,while the growth peak of new corm appeared after flowering.During this growth period,the absorption amount of N was the most,but the change was little.The absorption of K was bigger than P.During the later stage of the new corm's growth,the absorption amount of P became large and the peak value appeared in early April.To some certain extent,the absorption of Ca,Mg and Fe was related to the Freesia's growth above ground.