营养液镁浓度对结球甘蓝生长发育及镁吸收影响的研究

利用砂培方法，研究了不同镁浓度对结球甘蓝（ＢｒａｓｉｃｏｌｅｒａｃｅａＬ．ｖａｒ．ｃａｐｉｔａｔａＬ．）生长发育的影响；甘蓝不同生育期和不同器官对镁的吸收及镁对钙吸收的影响。结果表明，适宜甘蓝生长发育的镁浓度范围为０２～１６ｍｍｏ１Ｌ，最佳浓度为１０ｍｍｏｌＬ；甘蓝莲座期各器官含镁量为内叶＞茎＞外叶＞根；除二叶期外，随着镁浓度增加，甘蓝植株含钙量随之降低；甘蓝各生育期吸镁强度为结球期＞莲座期＞八叶期＞六叶期＞四叶期＞二叶期；在镁浓度为０２～１６ｍｍｏｌＬ范围内，叶绿素含量随Ｍｇ２＋浓度增加而增加。

Effect of Magnesium Concentration on Growth and Development and Magnesium Absorption of Cabbage (Brassic oleracea L.var .capitata)

Soil culture of cabbage at different levels of Mg showed that the suitable concentration of Mg for growth and development of cabbage was 0.2-1.6 mmolL,the gradients of Mg contained in different organs at rosette stage were inner leaves>stem>outer leaves>roots,and the Ca content in the plant dropped as increased the Mg supplied(except that at difoliar stage).The intensity of absorbing Mg by the plant was at heading>rosette>octofoliar>hexaforliar>tetrafoliar>difoliar stages.When the Mg ranged in 0.2-1.6 mmolL,the chlorophyll content increased as the Mg 2+ raised.