Non-invasive comparative analysis of the spectral composition of energy absorbed by crop species at leaf and plant levels was carried out using the absorption coefficient retrieved from leaf and plant reflectance as an informative metric. In leaves of three species with contrasting leaf structures and photosynthetic pathways (maize, soybean, and rice), the blue, green, and red fractions of leaf absorption coefficients were 48, 20, and 32%, respectively. The fraction of green light in the total budget of light absorbed at the plant level was higher than at the leaf level approaching the size of the red fraction (24% green vs. 25.5% red) and surpassing it inside the canopy. The plant absorption coefficient in the far-red region (700–750 nm) was significant reaching 7–10% of the absorption coefficient in green or red regions. The spectral composition of the absorbed light in the three species was virtually the same. Fractions of light in absorbed PAR remained almost invariant during growing season over a wide range of plant chlorophyll content. Fractions of absorption coefficient in the green, red, and far-red were in accord with published results of quantum yield for CO₂ fixation on an absorbed light basis. The role of green and far-red light in photosynthesis was demonstrated in simple experiments in natural conditions. The results show the potential for using leaf and plant absorption coefficients retrieved from reflectance to quantify photosynthesis in each spectral range.

使用从叶子和植物反射率中检索到的吸收系数作为信息度量，对作物物种在叶子和植物水平上吸收的能量的光谱组成进行非侵入性比较分析。在具有对比叶结构和光合途径的三个物种（玉米、大豆和水稻）的叶子中，叶子吸收系数的蓝色、绿色和红色部分分别为 48%、20% 和 32%。在植物水平吸收的光的总预算中的绿光分数高于接近红色分数大小（24% 绿色对 25.5% 红色）并在树冠内部超过它的叶子水平。远红色区域（700-750 nm）的植物吸收系数显着，达到绿色或红色区域吸收系数的7-10%。三种物质吸收光的光谱组成几乎相同。在很宽的植物叶绿素含量范围内，在生长季节期间吸收的 PAR 中的光分数几乎保持不变。绿色、红色和远红色的吸收系数分数与已发表的 CO 量子产率结果一致₂在吸收光的基础上固定。在自然条件下的简单实验中证明了绿光和远红光在光合作用中的作用。结果显示了使用从反射率中提取的叶子和植物吸收系数来量化每个光谱范围内的光合作用的潜力。