Thanks for the link. Looking at the phosphorus and potassium numbers,
it appears they are analyzing the nutrition of _raw_ rice. Check out
the differences between raw and cooked brown rice at the site I
mentioned earlier, and you'll see that phosphorus, magnesium, and
potassium drop to about one-fourth in cooked:

Since minerals like that are non-volatile, cannot be decomposed and are
unlikely to be irreversibly chelated, and assuming that the rice isn't
boiled and drained, they must be comparing equal weights of raw and cooked
rice w/o compensating for water.

-DM