Some people with chest pain have normal or minimal narrowing of heart arteries; in these patients, vasospasm is a more likely cause for the pain, sometimes in the context of Prinzmetal's angina and syndrome X.
You are here. Pure Live Seed. Pure live seed (PLS) is a measure used by the seed industry to describe the percentage of a quantity of seed that will germinate. PLS is obtained by multiplying the purity percentage by the percentage of total viable seed, then dividing by 100.
When seeded alone, use 15 pounds per acre of certified seed, which is about the equivalent of 13 pounds per acre of pure, live seed (PLS). When seeded with a grass, 10 pounds per acre of bulk alfalfa seed (equal to eight pounds per acre PLS) is sufficient.