The goal of this study was to evaluate the morphogenetic, physiology, and forage mass characteristics of Mavuno brachiariagrass (Urochloa brizantha × Urochloa ruziziensis) under shading. The experiment was analyzed as split-plot. Whole plots were two growing seasons (spring/summer and fall/winter) and the subplots were shade levels (0, 30, 45, and 73%). There is a linear positive effect of shade on leaf elongation rate, leaf blade lengths, canopy height, chlorophyll indices, leaf percentage, and leaf to stem ratio. Shade linearly decreased stem and inflorescence percentages and tillers number. There was a quadratic effect of shade on growing cycle length, forage mass, and photosynthesis. Regarding to seasons, spring/summer presented higher rates of leaf appearance, leaf elongation, and stem elongation compared to fall/winter. In conclusion, Mavuno brachiariagrass harvested at 95% LI presents great adaptation to shading of 30%, without impairing the forage mass although increasing leaf size, chlorophyll indices, and canopy height.

这项研究的目的是评估Mavuno brachiariagrass（Urochloa brizantha  ×  Urochloa ruziziensis）的形态，生理和饲料质量特征。）在阴影下。将实验分析为分裂图。整个地块为两个生长季节（春季/夏季和秋季/冬季），子图为阴影级别（0％，30％，45％和73％）。阴影对叶片伸长率，叶片长度，冠层高度，叶绿素指数，叶片百分比和叶片与茎的比率具有线性正效应。阴影线性降低了茎和花序的百分比和分till数。阴影对生长周期长度，草料质量和光合作用有二次影响。关于季节，与秋/冬相比，春/夏季的叶片外观，叶片伸长率和茎伸长率更高。综上所述，以95％的LI收获的腕带马鞭草（Mavuno brachiariagrass）表现出对30％遮荫的极大适应性，尽管增加了叶的大小，叶绿素指数，