镁镁对叶绿素（光合作用的色素）合成是必要的，常常很丰富，一般不是限制因素。
Magnesium. Magnesium is essential for the synthesis of chlorophyll, the green pigment of photosynthesis. It is usually fairly abundant and does not ordinarily represent a limiting factor.
光合碳代谢和光化学反应受低温限制是冬季光合作用较低的重要原因。
Low temperature in winter limited photosynthetic carbohydrate metabolism and photochemical reaction caused low photosynthesis.
结果表明，施用锰肥能降低光合作用的气孔限制和非气孔限制，显著提高夏玉米光合能力。
The results showed that application of manganese fertilizer lessened the stomatal and non-stomatal limitation on maize photosynthesis performance.
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