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Check the numbers, check the price, then check the spread rate. For some folks, a "bag of fertilizer" is all they need. If you check the numbers, the price is probably close for per-pound of nitrogen. But, then, all the nitrogen in the world won't "green up" grass in real alkaline soil, because it needs iron to use the nitrogen. Some sandy soil is high in - phos? pot? - I forget which, so watch the p that you put on sandy lawns :o)