I am not sure how many conversations I have had related to this subject, but quite a few. When buying fert and comparing similar slow release pecentages, buy the most amount of N for the least price. If you are looking at a 25-?-? 50% and it cost you $14.00 it cost $1.12 per lb of N. If you compare that to a 34-?-? 50% product for $16.00 you are paying $.94 for every lb of N. Although these prices might not be accurate every time I have compared a 20% N to a 30% N the 30% product was always less. If you are buying a truckloasd that $.16 per lb of N will translate to a $2393 savings or a $108 per pallet over the cost of the N in the 25-?-? product. Buy smart, there are no benefits in buying a lower amount of N for more money just because you want to spread 4 lbs/M of fert compared to 3lbs/M with the 30% product.