+ ; It varies tremendously frou place to place. What I eae after is what appeared to me to be the most valid. Available calaiua may be equal to the calcium that goeslinto grass. | ‘This fs available calcium in tilled 9041 anf soil that under cultivation. It fe just like Jerry Hill trying to take senbud's data, the nusber of places at which you have mate the is the mall pert of the earth's surface. This varies tremendously with your location. Yes, but we have it figured for average plants. dust + 7 average -— but realises what you are doing. Is this going to affect the number of bombs linearly? Yes2 sir. Is availability synoncmous with exchangeable? Of course, you are leading up to sncther question and whether the deposited strontiun ie wiiformly mixed with ¢ availablecaloiumg whieh I think would be « big question This comes on the surface and the plants you are feeding dam two or three feet below, you wouldn't get mixing. roots z think the stuff is pretty well fixed on the top 2 or 3 inches. Wouldn't rain sweep it down? No, I think the finding is that calcium and strontiua are pretty well to the soil particles and the zovexent is pr Mr. Larson has some data on that. Dips «ie Verges Mey . bee wl .