Wheat, corn and soybean prices soared this week as crop condition ratings showed much greater declines than expected in last Monday's weekly report. This week's record high temperatures almost guarantee more significant declines in Monday's ratings. The big rallies were led by talk of big and irreversible yield losses in corn and soybeans in the U.S. and in wheat in Russia and the Ukraine.  There are now estimates of a sub 48 MMT Russian wheat crop, and that has big implications for Black Sea exports. Spring grain production was also reportedly cut another 10 percent in the Ukraine because of dry and hot conditions there.  The slow starting Indian monsoon is also causing some concerns about groundnut production and oil productio...