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镁是植物生长一个很重要的元素,是叶绿素分子的组成核心,直接参与光合作用.在幼嫩而具有生命活动的组织器官中促进磷酸酶和磷酸葡萄糖转化酶的活动,有助于单糖的转化,促进碳水化合物的代谢和呼吸作用的进行.因此,镁不足便会影响植物的正常生长和发育.当镁在橡胶树叶片中的含量偏低时,最初从暴光面较大的顶蓬叶上表现症状,从叶基到叶尖边缘向内发展,叶肉和网状小脉由浅绿、黄绿逐渐黄化.而中脉、侧脉及周围叶肉仍保持绿色呈“鱼骨状”的黄化现象.根据资料报道,叶片干重含镁0.35—0.45%是胶树生长的正常值,含量少于0.27%时叶片发生生理上的变化,低于0.15%时便山现黄化.从福建热作所对胶叶的分析材料看,漳浦的胶叶含镁量较高,为0.29一0.41%;诏安次之,为0.21—0.49%,云肖、平和等县均低,一般为0.14—0.27%.据1980年秋大田调查的情况与实际测定基本相符,现加以分析如下:
Magnesium is a very important element of plant growth and is the core of the chlorophyll molecule and is directly involved in photosynthesis.It promotes the activity of phosphatase and phosphogluconate converting enzyme in young and living tissues and organs, Conversion and promote the metabolism of carbohydrates and respiration progress.Therefore, magnesium deficiency will affect the normal growth and development of plants.When the content of magnesium in the leaves of the tree is low, the first from the exposure of the larger roof leaves The performance symptoms developed inwardly from the leaf base to the tip of the tip, and the mesophyll and reticular veins gradually turned yellowish from light green to yellowish green while the midrib, lateral veins and surrounding mesophyll remained green with “fishbone” yellowing According to the information reported, the leaf dry weight of magnesium 0.35-0.45% is the normal growth of gum trees, the content of less than 0.27% of the leaves physiological changes, less than 0.15% when the mountain is yellow .From Fujian The analysis of plastic material leaves, Zhangpu gum leaves higher magnesium content, 0.29 to 0.41%; Zhaoan times, 0.21-0.49%, Yun Shaoxing, peace and other counties are low, usually 0.14- 0.27%. According to the investigation of the autumn field in 1980, the situation and the actual determination of the basic phase , Are analyzed as follows: