It is C3 plant that can't shade tolerance. So it has to be planted on sunny fields.
说明柠条为C3植物，不耐荫，应栽植在阳光充足的地方。
The results indicated that poinsettia was a sun plant with high light-saturation point and low light-compensation point. But the shade tolerance of different cultivars was different.
结果表明，一品红具有较高的光饱和点和较低的光补偿点，是对光照强度适应能力较强的阳性植物，但不同栽培品种对遮荫环境的适应性有较大差异。
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