Hullin 88: Ecological Benefits of Covering the Blood

Blood that splatters and blood that's left on the knife also need to be covered, with a verse to make that point. As long as there's no other blood there at the same time. But if the life-blood was covered, then these other extra locations of blood do not to be covered. Also, a new mishnah - with a long list of substances that can be used for covering the blood, including that which can make plants grow. Plus, defining "fine sand," as a possible blood-coverer. Also, what do you use if you're in a situation where there's no material that will support the sprouting of seeds after covering the blood?