Historically, the cultivar Giles has been a heavy producer of pecans. So heavy, that kernel fill often suffers during "on" years. This year, our Giles trees have a good to heavy crop and with all the dry weather we've experienced this year, I was afraid most of our Giles nuts would end up on the cleaning pile (ei. poorly filled, light nuts). The photo at right is a cross section of a Giles nut cut last week (14 Sept. 2011, before the rain). You can see lots of air spaces and poor kernel development.
There are a couple more things you can notice in the photos about kernel filling . Look carefully at the shell packing material between the two kernel halves. As the kernel has expanded, the partition between halves has become compressed and appears more woody. Also compacted by kernel deposition is the packing material that fills the dorsal groves. Note the color change from orange to tan.