Hi Mohammad, Terminal spikelet point: I did some field work last summer on some Canadian spring wheat cultivars. For 3 of the cultivars (early-maturing) terminal spikelet initiation (TSI) occurred between the 4th and 5th leaves, and for the late-maturing cultivars it occurred between the 5th and 6th, regardless of seeding date. More so similar results have been observed under controlled environment studies in growth cabinets. Until enough of such experiment has been done with different cultivars to emphasis the synchrony between TSI and number of leaves on the main stem, I am afraid you may have to do a similar work on your cultivars. If this seems to be of some help, and you need some more details, do not hesitate to let me know. Good luck, CHARLES.