yep, they're pretty much all the same. app rate is going to depend on your pattern width, ground speed, gate setting, and the humidity that day (dry fertilizer flows faster than damp at a given gate setting).
if you get your fertilizer in 50# bags, i'd toss 1 bag in, pick a ground speed that is a comfortable speed to drive, figure out how wide it spreads (remember to overlap some), pick a gate setting, and see how far you go with it. figure out the acreage and adjust the gate setting up or down, try another bag. when you're close enough, go for it.
another approach is make sure you are under-applying, do the whole field, then you'll know what you did (write down that info for next year) and you can make adjustments to make up the difference the second time over.
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