Northern Ohio Grain | JUST LEARNING - 10/22/2014 09:32
I calculate bin one at 195 and bin 2 at 193
12000 x 56 = 672000>>>>>> 672,000/61.5/56 = 195
11570 x 54 = 624,780>>>>>> 624,780/57.8/56 = 193
Bin 1 yielded 195 bu per acre
12,000 bu / 61.5 ac = 195
Bin 2 yielded 200.2 bu per acre
11570 bu / 57.8 ac = 200.2
I would take Bin 2 with the lower test weight cause it yielded better.
JUST LEARNING - 10/22/2014 09:32
A bushel is a measure of volume, but since corn is traded in weight we use it as a measurement of weight by saying a standard bushel weighs 56 lbs.
You do not use the test weight factor as a multiplying factor.
A bushel of 54# TW corn does not have a weight 54 lbs. The test weight represents mass/volume.
Technically in our industry since we sell bushels by 56 lb, a bushel is a measurement of weight, not volume. Test weight is the measurement of density (mass/volume).
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A bushel of 54# TW corn has a weight of 56 lbs.
Another way to look at the difference between volume and weight is this. (Thanks Tim for the idea)
A gallon of water has a volume of 128 oz.
But a gallon of water has a weight of 133.44 oz.
It does not weigh its volume.
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Another way to look at test weight and volume. I'm sure everybody has seen that as corn dries, test weight increases.
Why is that? Its not because the kernel is getting heavier. Its because the kernel is shrinking.
As the kernel shrinks, the bushel takes up less space or volume, and as a result test weight increases.
That same bushel still weighs 56 lbs.
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Another pet peeve I have with the whole test weight deal.
Test weight is often labeled on grain slips as...
Test Weight 60.0 # or lbs
To simplify the confusion and to actually be correct it should read...
Density 60.0 lb/vol
Edited by steiner43511 10/22/2014 18:52
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I'm sorry I'm posting this. I never thought I'd get into the TW debate but...
