Anything I've ever read on it shows most grasses as having MORE calcium than phosphorus, BUT they are both in small quantities and don't have AS MUCH more calcium than phosphorus as legumes. This is why you can feed horses just grass hay and they do fine. But add grain and you can get in trouble. For example, bermuda grass has .30 percent calcium and .19 percent phosphorus, so it's got more calcium than phosphorus. However, alfalfa has 1.24 % calcium and .22% phosphorus, an much higher ratio, which is why it's so great for calcium. What I'm saying is that yes, we need alfalfa to balance out the grains, which have an inverted ratio, but grass STILL does have more calcium than phosphorus. But grass hays cannot make up for the imbalance grain creates as well as alfalfa can. Don't mean to get off track, just didn't want people going around thinking grass hay has an inverted ratio like grain does.