Bermuda is a longer and courser grass than bent grass. On Bermuda the ball is dramatically affected by the grass. A putt traveling in the direction of the grain the faster and farther: one going against the grain the ball will roll slower and not as far. When grain is running across on a level putt, the ball will break in the direction of the grain.
Grain tends to grow along the direction of the slope, or the way that water runs off the green. Some of the other very influenced ways is towards the setting sun or cup will also show where the grain is going. The cup will be rough on the side of the cup which the grain is growing. The texture and color of the grass is also an indicator of the direction of the grain: When you look downgrain, the putting surface will appear lighter and have a sheen to it. Upgrain, the grass will appear darker and coarser Finally there are many important ways to reading Bermuda greens over bentgrass.