Pecan kernel filling.
I've mentioned a clone we've labeled SWB617 in previous posts. We think this tree originated as a Giles seedling so I thought it would be interesting to compare SWB617 with Giles in terms of nut development (photo above). The Giles nut was still in the water stage while SWB617 had started to deposit kernel inside the nut. However, I spotted a potential kernel filling problem inside the SWB617 nut. Notice how thick the layer of kernel has formed on the dorsal side of each kernel half. Compare that to the thin layer that has developed next to the inner wall partition (blue arrow).
Uneven kernel deposition is a sign that the tree is under stress and is having difficulty pumping enough energy into the seed. Two common stresses that cause poor kernel fill are lack of available soil moisture and excessive crop load. Water seems to be the culprit in this case. However, all is not lost. A good soaking rain this weekend could relieve the water stress and this nut would still go ahead and fully fill out its kernel.