Perhaps the most important relationship to understand is between grain moisture and TW. As kernel moisture decreases, grain TW increases. Why? The reason is two-fold: as grain dries it also shrinks allowing for more kernels to "pack" into a volume bushel (think of it as the equivalent of cramming defensive linemen into a phone booth versus cornerbacks). Additionally, dry corn is naturally more slippery, or slick, which tends to allow for better packing. In 2009, it's certain that corn will come off the field wetter than most years. Expect lower TW's from the moisture factor alone